Showing posts with label Information. Show all posts
Showing posts with label Information. Show all posts

Oct 8, 2021

Top Terrace Waterproofing - Standard Work Procedure

 Top Terrace Waterproofing


Introduction:

This standard operating procedure enumerates the scope of Waterproofing work in toilets to be executed in Tower area as specified in the approved drawings.


Responsibility:  

The respective Tower-in-charge is responsible to execute the work as per procedure.

Safety & protection:

PPEs like safety belts at height, helmets, safety goggles etc. should be used properly. 

Ensure the working area is kept clean for easy access.

Proper illumination to be provided during the work, if required.

Educate the workmen through pep-talk meeting. 


Preparatory works:

Cleaning of slab base and sides of beams shall be carried out as regards all those materials, mortar, oil etc. thoroughly by wire brush and the area shall be washed clean.

PVC sleeves should be removed.

Slab should be filled with water and next day should be inspected for leakages.

If Leakages found, then cracks should be open out by making grove and pressure grouting by socket should be done. After completion of treatment sunken slab should be again recheck for any leakages.

Ensure all plumbing lines are installed on top of slab as per slope specified in approved drawing.


Work Method:

Brick bats should be soaked thoroughly for about 15 minutes prior to their placing.

Cement mortar in 1:4 proportions should be prepared and laid on slab. Mortar mixed shall be used within 1Hour of preparation.

 Pre-soaked brick-bats shall then be laid in straight / radial, by inserting brickbats to a depth of about 15mm by light tamping with the help of mallets. Distance between adjacent layers of brickbats shall not exceed 25mm.

 Application of brick-bats shall proceed from one corner. Thiyya (level pads) for the same shall be given by Site Engineer, considering into account adequate slope towards rain water drain.

Mortar should be filled up to half height of brick bats and it should be cure for minimum 3 days. 

After curing is over, the surface shall be applied with a finishing coat of cement sand mortar in the proportion 1:4 with waterproofing compound (Fosroc Conplast X 421 IC) @ 150ml per bag of cement till top of brick-bats.

 Top coat shall be of neat cement slurry of adequate consistency and shall be done monolithic with topping of brick-bats with slope towards rain water drain.

Finished surface shall then be cured for at least 7 days by ponding and then tested for leakages, if any.



Team 

CBEC India

Oct 1, 2021

Kitchen Platform - Standard work Procedure

 Kitchen Platform


Introduction:

This standard operating procedure enumerates the scope of Tiling work to be executed    in Tower area as specified in the approved drawings and at places when instructed by the Tower-in-charge.


Responsibility:

The respective Tower-in-charge is responsible to execute the work as per procedure.


Safety & protection:

PPEs like safety belts at height, helmets, safety goggles and ear plugs etc. should be used properly. 

Ensure the working area is kept clean for easy access.

Proper illumination to be provided during the work, if required.

Educate the workmen through pep-talk meeting. 




 

Preparatory Works:  

Check the height of Platform vertical is as specified in drawing. Vertical top should be in level.

All visible edges of platform granite should be polished before fixing it in place.

Slot the wall 2 in depth at correct height as specified in drawing for inserting platform in wall.

Cutting of Kitchen sink and gas hole should be done as per approved drawing and checking the pluming points on wall.

At wall where the gas cutout in platform comes chase the portion to fix the flexible pipe for gas. Gas hole is to be taken from skirting and through wall take it below platform.




Work Method:

At sink area first fix the secondary marble and then fix the sink as per drawing and plumbing points on wall.

Apply the resin hardener adhesive on top of vertical. And place the platform in position by inserting it by 2 in wall.

Check the top level of platform it should not have any slop.

Fill the wall chase area in mortar of 1:4.

Do fix skirting in place as per drawing.

At gas hole put the flexible pipe in wall with a sample gas pipe inside of it, for insuring the correct curvature of pipe and fill the wall chase portion with cement mortar of 1:4.

Flexible pipe should be then cut at the face of skirting and below platform at the face of wall and sealed properly.

Fix the facia patti (Architrave) as per approved drawing with resin hardener. Coins should be inserted into facia patti and platform to increase its stability.

Apply the approved sealant around sink and platform joint neatly to make it waterproof.

Grout the joints with approved grout and clean the platform.

Do apply light coat of clear oil on granite face for protection.




Post Checks:

Check the gas hole for its operation.

Check the level of platform.

Check for alignment of sink with plumbing points.

Check for any visual defect.


Team

CBEC India

Sep 24, 2021

Toilet Waterproofing - Standard Operating Procedure

Toilet Waterproofing


Introduction:

This standard operating procedure enumerates the scope of Waterproofing work in toilets to be executed in Tower area as specified in the approved drawings.


Responsibility:  

The respective Tower-in-charge is responsible to execute the work as per procedure.


Safety & protection:

PPEs like safety belts at height, helmets, safety goggles etc. should be used properly. 

Ensure the working area is kept clean for easy access.

Proper illumination to be provided during the work, if required.

Educate the workmen through pep-talk meeting. 




Preparatory works:

Toilet plumbing lines are installed in Blockwork and chases are rendered with non-shrink grout prior to cleaning activity of sunk is undertaken.

Cleaning of sunken slab base and sides of beams shall be carried out as regards all those materials, mortar, oil etc. thoroughly by wire brush and the area shall be washed clean.

PVC sleeves should be removed.

Sunken slab should be filled with water and next day should be inspected for leakages.

If Leakages found, then cracks should be open out by making grove and pressure grouting by socket should be done. After completion of treatment sunken slab should be again recheck for any leakages.


Work Method:

Base coat using cement mortar in proportion 1:3 with waterproofing compound (Fosroc Conplast X 421 IC) @ 150ml per bag of cement shall be applied over top of base slab of sunk. Maximum thickness of base coat shall be 25mm at upper end of slope.




Proper slope shall be given to base coat as per drawing towards drain spout and drain spout to be fitted simultaneously with the base coat, as an additional precaution to take care of seepage, if any. Drain spout shall be 25mm in diameter UPVC with GI mosquito mesh coupling to be fixed on both end. It should project at least 4 beyond wall surface.

Base coat shall also be applied to the sides of the toilet sunk up to one foot above the finished floor level (F.F.L) of the adjacent floor. 

Curing of base coat shall be done by ponding for 3 days and checked against leakage. Leakage, if observed shall be rendered with reapplication of base coat to ensure no leakage.

 Floor traps and other plumbing lines shall be installed, Slope of 1:100 shall be provided for toilet piping and water proofing. Floor trap shall be fixed with respect to finished floor level (F.F.L) of the toilet.

Area of pipe which is going through the hole / opening provided in beam should be made rough by applying cement solvent and sprinkling crush sand over it so that bonding between mortar and PVC pipes will be ensured.

Brick bats should be soaked thoroughly for about 15 minutes prior to their placing.

Cement mortar in 1:4 proportions should be prepared and laid on slab. Mortar mixed shall be used within 1Hour of preparation.

 Pre-soaked brick-bats shall then be laid in straight / radial, by inserting brickbats to a depth of about 15mm by light tamping with the help of mallets. Distance between adjacent layers of brickbats shall not exceed25mm.

 Application of brick-bats shall proceed from one corner. Thiyya (level pads) for the same shall be given by Site Engineer, considering into account adequate slope.

Mortar should be filled up to half height of brick bats and it should be cure for minimum 3 days. 

After curing is over, the surface shall be applied with a finishing coat of cement sand mortar in the proportion 1:4 with waterproofing compound (Fosroc Conplast X 421 IC) @ 150ml per bag of cement till top of brick-bats.

 Top coat shall be of neat cement slurry of adequate consistency and shall be done monolithic with topping of brick-bats.

Finished surface shall then be cured for at least 7 days by ponding and then tested for leakages, if any.


IMPORTANT NOTES:

Water-proofing once done, shall not be broken or pierced. If water proofing is to be punctured, due care shall be taken to limit the damage to the restricted area. The cracks due to hammering shall not spread over the large area.

Repairing of the punctured area shall be done by using bonding agent and expansive grouts.


Team

CBEC India

Sep 17, 2021

Which material is suitable for sealing tie rod holes of RCC wall? Technical Data Sheet

 PENECRETE MORTOR

DESCRIPTION

PENECRETE MORTAR consists of Portland cement, specially treated quartz sand, and a compound of active chemicals. The active chemicals react with moisture and the by-products of cement hydration to cause a catalytic reaction, which generates an insoluble integral crystalline complex. These crystalline complexes grow in the presence of water and block the capillaries of the concrete and minor shrinkage cracks, thus waterproofing the concrete. Chemical activation begins when the powder is mixed with water and may take several days to completely block the capillaries, depending on ambient temperature and environmental conditions.



APPLICATIONS

Applied in conjunction with PENETRON for: Installation of seal strips, reglets and coves at joints to assure water tightness Patching of tie holes and faulty construction joints Patching and filling of routed out cracks Repairing of spalled and honeycombed areas.

ADVANTAGES

Can be applied to the positive or negative water pressure sides of a structure Resists strong hydrostatic pressure Seals cracks up to 1/64” (0.4 mm) Easy to use – needs only to be mixed with water prior to application Allows the concrete to “breathe” Can be skim coated or feather edged Can be applied to moist concrete Fast setting Inorganic – contains no polymers NSF 61 certified for use in potable water applications Non-flammable Resists abrasion and mechanical wear Freeze/thaw resistant Zero VOC - PENETRON powdered products contain zero volatile organic compounds and are safe for use both outdoors and in confined indoor spaces.


DIRECTIONS FOR USE

Surface preparation:

All surfaces to be patched, repaired, or sealed with PENECRETE MORTAR must be clean and sound. Cracks should be routed out to a U-shaped configuration, approximately 3/4” (19 mm) wide and a minimum of 3/4” (19mm) deep. Tie holes should be roughened prior to filling. Spalled and honeycombed areas must be thoroughly cleaned and chiseled back to sound concrete prior to repair. Remove all dirt, cement laitance, form release agents, curing compounds, paints, coatings, etc. by means of wet or dry sandblasting, high-pressure water jet, or other suitable mechanical means. Surfaces must be well moistened to dull dampness at the time of application. The concrete should be damp with no wet sheen on the surface.

Mixing:

Routed cracks, coves, and non-moving joints: Add water to PENECRETE MORTAR until a medium-stiff, trowelable consistency is reached. The texture of the mix should be pliable enough to be trowelled into the cracks with some pressure, but not so pliable that it would run out or sag out of the crack. The approximate mixing ratio (by volume) is 4.5 parts powder to 1 part water. Alternatively, 3.4 oz (101 ml) of water to 1 lb (454 g) of PENECRETE MORTAR powder.

Tie holes and pointing applications: Add only a small amount of water. Mixed consistency should be that of “dry earth,” holding a shape when squeezed in your hand but easily crumbled when pressed between fingers. Mix only as much material as can be used within 20 minutes.


Application:

Cracks/seal strips (reglets & coves): After proper surface preparation and routing to appropriate configuration, prime areas to be patched or repaired with a slurry coat of PENETRON and while “green” (tacky), fill cavity flush to the surface with PENECRETE MORTAR in mortar consistency.

Spalled and honeycombed areas: Prepare surface and chisel back to sound concrete. Prime area to be repaired with a slurry coat of PENETRON. While still “green” (tacky), apply PENECRETE MORTAR™ in layers of 1/2” (13 mm) not to exceed 2.5“ (6.4 cm). Each layer should be allowed to set long enough that it will leave only a slight indent, approximately 1/16” (1.6 mm) when pressed with a finger. Where possible, the surface of the repair should be packed tightly using a hammer and block of wood. Tie holes and pointing applications: Prepare surface and chisel back to sound concrete. Prime area to be repaired with a slurry coat of PENETRON and while still “green” (tacky), apply PENECRETE MORTAR in “dry earth” consistency. PENECRETE MORTAR should be tightly rodded into tie holes or packed tightly using a hammer and block of wood.

NOTE: For all applications, PENETRON should be applied as a surface treatment as soon as PENECRETE MORTAR has set (approximately 1-2hours). If this is not practical, leave the surface rough for subsequent surface treatment to bond.

Curing:

Provide protection against extreme weather conditions, such as heavy rain or freezing conditions, during the setting period. Curing is not normally required except during hot, low humidity weather. In these conditions, a light mist of water approximately 24 hours after the repair is completed will help to ensure a controlled cure. In extreme dry heat, water misting may be required more frequently.


SPECIAL CONSIDERATIONS

DO NOT apply PENECRETE MORTAR™ at temperatures below 40ºF (4ºC), to a frozen substrate or if temperatures will drop below freezing during the curing period (approximately 24 hours). This product is not recommended for use in expansion joints or other joints designed for movement. PENECRETE MORTAR™ can be applied in 1/2" (13 mm) layers not exceeding 2.5“ (6.4 cm) to prevent shrinkage cracks in the mortar.

CONSUMPTION & YIELD OF 50-LB (22.7-KG) BAG

All values are approximate depending on surface conditions.

U-shaped cracks and reglets

Size 1”x1” (25 mm x 25 mm)

Consumption 1.0 lb/ft² (4.9 kg/m²)

Yield/bag 50 ft (15.2 m)

Coves, triangular shaped

Size 1.5”x1.5” (38 mm x 38 mm)

Consumption 1.0 lb/ft² (4.9 kg/m²)

Yield/bag 50 ft (15.2 m)

Tie holes

Size 1”x1”x1” (25 mm x 25 mm x 25 mm)

Consumption N/A

Yield/bag 600 nos

Honeycomb and surface patching

Approximately 0.4 ft³ (0.01 m³) / bag


PACKAGING

PENECRETE MORTAR is available in 50-lb (22.7-kg) bags or 55-lb (25-kg) pails.

STORAGE / SHELF LIFE

PENETRON products must be stored dry at a minimum temperature of 45ºF (7ºC). Shelf life is one year when stored under proper conditions.

TECHNICAL DATA

Compressive strength (ASTM C-109):

1 day 1600 psi (11 MPa)

3 days 2400 psi (17 MPa)

7 days 5800 psi (40 MPa)

28 days 6900 psi (48 MPa)

Tensile Strength (ASTM C-190):

1 day 320 psi (2.2 MPa)

3 days 520 psi (3.6 MPa)

7 days 730 psi (5.0 MPa)

28 days 900 psi (6.2 MPa)

NOTE: Cooler temperatures, inadequate ventilation, and higher humidity can extend drying times. All

data derived from tests under laboratory conditions; field conditions may yield slightly different results.



TECHNICAL SERVICES

For more detailed instructions, alternative application methods, or information concerning the compatibility of the PENETRON treatment with other products or technologies, contact the Penetron Technical Department or your local Penetron representative.

SAFE HANDLING INFORMATION

PENECRETE MORTAR contains cement that is alkaline. Will irritate eyes and skin and may cause skin sensitization. Wear appropriate eye, skin, and breathing protection when using this product. Avoid contact with skin and eyes. In case of contact with the eyes, rinse immediately with plenty of water and seek medical advice. For further information, please refer to Safety Data Sheet. KEEP OUT OF REACH OF CHILDREN.


THIS IS THE MOST RECOMMENDED AND SAFE MATERIAL AS PER OUR EXPERIENCE.


Team 

CBEC India

Sep 3, 2021

External Plaster Work - Standard Work Procedure

External Plaster Work


Introduction:

This standard operating procedure enumerates the scope of External Plasterwork to be executed in the Tower area as specified in the approved drawings and at places when instructed by the Tower-in-charge.

Responsibility: 

The respective Tower-in-charge is responsible to execute the work as per the procedure.

Safety & protection:

Use double scaffolding always and ensure the scaffolding is adequately braced with the permanent structure, for working at heights. Unless it is tagged as safe for use by Safety Officer no work should be carried out on that scaffold area.

PPEs like safety belts at height, helmets, safety goggles, etc. should be used properly. 
Ensure the working area is kept clean for easy access and protect edges of opening by barricading etc while working.

Inspect the scaffolding before starting work.

Proper illumination is to be provided during the work if required.

Educate the workmen through a pep-talk meeting. 
 

Preparatory works:

Complete all external works like Check certificate provided by Safety Officer for scaffolding.

Filling of all vertical and horizontal joints of the block with AAC Block Adhesive.

Filling of the gap between block top and RCC member bottom area with cement mortar and apply non shrink grout on the surface.

Fixing of fiber mesh on all Block to RCC Joints.

Fix level pads (dhada), by tying line thread, from top to bottom, at corners and intermediate distances and it should be checked by the concerned engineer.

Ensure hacking on AAC block and RCC Surface.

Electrical and plumbing fixtures are checked for their alignment.

 Work Method:

 Mortar Preparation:  

The mortar for plastering has to be prepared in a Tray or on metal sheets only. The sand has to be sieved for proper gradation.

The sand has to be washed to remove impurities like a mud if required, and sufficiently dried before plastering work is taken up.

In case wet sand is to be used, check for the quantity of water in a mortar and allow for bulkage of sand while mixing, for ensuring consistency of mortar.

Crush Sand and River Sand should be used in 50:50 proportions.

Do prepare the mortar in proportion as follows;

Bond Coat / Key Coat  1:4 (1 part Cement, 2 Part River Sand, and 2 parts Crush Sand) with waterproofing compound @ 150 ml Per bag of cement (BASF MaterEmaco 141) to be done in thickness 8 to 10 mm.

Finish  Coat  1:3 (1 part Cement, 1.5 Part River Sand and 1.5 parts Crush Sand) with 6mm fibers @ 100 grams per bag of cement ( Strongplast ) and waterproofing compound @ 150 ml Per bag of cement (BASF MaterEmaco 141) to be done in thickness of 12 to 15 mm.
Then do Dabba finish (sand face finish).

Do mix mortar which can be consumed within the next 2 hours.

Do add water to the dry mixed sand and binder (not otherwise).

Bond Coat / Key Coat

Do wet the surface to receive plaster one hour before, so that while starting plastering, the surface is skin dry.

Bond Coat / Key Coat shall be started from the top and worked downwards.

Curing should be done for min 3 Days.

 Finish  Coat

Do throw the mortar for an area coverable by the straight edge, both vertically and horizontally in one stretch.

Do level the surface using the straight edge.

Do float the surface and finish as per specification.

Do repeat this operation for the entire area in stages.

While proceeding with the work, do float and finish the joints in the I stage and then in subsequent stages properly. This is to ensure the stages, in plastering work, are not apparently visible.

Intermediately do check the surface for plumb, line, and level and make up all deficiencies.
If there are grooves in the design, then they should be made at the locations specified.

However, care should be taken to see that the depth of the groove does not cut the base coat or it will lead to leakage.

After making the groove it should be finished neatly with a paste of cement and waterproofing compound. Then do final finishing by brushing.

Do jambs finish in openings in line with internal plaster face or as per level pads and ensure right angles at the corner.

Ensure edge finishing around switchboards is done correctly.

In case of unavoidable situations where the scaffold needs to brace in-wall, the pocket should be sealed and match the plaster finish immediately after removing it.

Curing should be done for min. 7 Days.

After completion of plaster clean the area.

Dos and Do nots:

Do’s:

Do check thoroughly before and immediately after plastering, the line and levels.

Do check thoroughly before and immediately after plastering, the surface areas for unevenness, surface blemishes, etc so that all rectification (if required) can be carried out within the final setting time, without any additional costs.

Do cure the plastering well for the required number of days.

To restrict the access to areas where plastering is complete (This will ensure better protection of edges, corners, angles, etc).

To ensure all touch-ups are done neatly after pre-cast slabs are embedded in position, working platforms are inserted in position, sanitary fixtures are fitted (merging the surfaces being touched up with original surfaces).

Do stop the work preferably in corners, jambs, stoppers or at grooves, etc. This will avoid cracks at joints. To ensure these joints are finished neatly.

Do not:

Do not allow mortar mixing on the unclean areas and in large quantities.

Do not allow usage of partially set mortar.

Do not allow free sprinkling of dry cement in the mortar or on the surface being plastered, as this may cause uneven shrinkage and lead to the development of shrinkage cracks.

Do not mix different brands of cement in the same area as this will show the color difference (till plastered surfaces are covered with some other finish). 



Team
CBEC India

Aug 26, 2021

Internal CPVC and PVC concealed plumbing Work - Standard Work Procedure

Plumbing Work

(Internal CPVC, PVC concealed)

Introduction:


This work procedure enumerates the scope of Plumbing work to be executed in Tower area as specified in the approved drawings and at places when instructed by the Tower-in-charge.


Responsibility:  


The respective Tower-in-charge is responsible to execute the work as per procedure.

Safety & protection:


PPEs like safety belts at height, helmets, safety goggles, ear plugs and hand gloves etc. should be used properly. 

Ensure the working area is kept clean for easy access.

Proper illumination to be provided during the work, if required.

Educate the workmen through pep-talk meeting. 


Internal CPVC concealed plumbing:


Preparatory Works:


Ensure the plumbing materials received are as per the approved drawing and specification.

Check the tile layout marking on walls and level pads showing the finish wall face after tiling.

Do mark the reference level on wall at 600mm above FFL.

With the help of tile layout and plumbing drawing mark the points and plumbing lines on wall.

Check the layout and do adjustment to bring points at correct location as per tile layout, required if any.

Chase the marked wall portion first with cutting machine by making small slices on wall and then remove it with chisel and hammer.

Mark the plumbing point on wall again in order to measure the length of pipe required to be cut.

On ground assemble the skeleton of pipes and fittings (Elbow, T, brass elbow, socket etc.). Use CPVC adhesive supplied by manufacturer for jointing.

Check the alignments of elbow fitted on pipe for their alignment, if elbows are fitted incorrectly then same should be removed by cutting pipe and new fittings should be made (Record the wasted material due to poor workmanship).


Work Method: 


Fix the assembled skeleton on wall with plumbing nails and binding wire as per layout.

Do pressure testing of installed line as follows;

For pressure testing ensure hydraulic pressure testing machine of capacity 20kg/cm2 is available.

Fix the connector pipe to machine and on the end point on wall or on point which is most feasible for doing testing.

Fix a ball valve at another end point to release the entrapped air in pipe to avoid false result during testing.

Fix plugs on all other points.

Apply the pressure at 10kg/cm2 and keep it for 45 minutes.

Do check for any visible leakages at joints and at plugs.

If pressure drop observed or any leakage is observed rectify the same and do pressure testing again.

After successful testing, record the result. Fix all elbow points in position with the help of cement paste.

Check all points for its correct alignment. All elbow points should be fix 10mm in from finished tile face to ensure proper grouting and sealing of joint at later stage of work. Flush wall should be fixed in position as per the specification of manufacturer.


Do fill the chased portion with cement mortar of 1:4 and cure it for minimum 4 days.

Internal PVC Concealed Plumbing:


Preparatory Works:


Ensure the material received is as per approved plumbing drawing and specifications.

Do check leakage testing of waterproofing base coat is completed.

Do check all cutouts on wall for drainage are in plumb to ease the external plumbing work.

As per the tile layout and approved plumbing drawing do dry laying of points and measure the length of pipe required.
Fitting are push type (Ring fitting) which have rubber ring in fitting. File the cut pipe portion to avoid damages to rubber after fitting.

Apply lubricant supplied by manufacture on inner face of fitting and then insert filed edge of pipe inside it.

For Multi floor trap (MFT)  when there are two MFT or need to fit the WHB or any other pipe. Reducer of 50 x 40 should be used at MFT and it should be fixed to it, by using PVC solvent specified by manufacturer.

MFT should be fixed as close as to wall or max at 150mm from wall finish face.

Lay the assembled skeleton to its final location and fix in slop as specified with the help of cement mortar of 1:4.

Do check the all points and slop is as per approved tile layout and plumbing drawing.

At points where pipe crosses the wall, portion of pipe which goes into wall area should be made rough by applying PVC solvent and sprinkling sand on it to ensure bonding.


Team 
CBEC India

Aug 19, 2021

Gypsum Plaster/POP - Standard Operating Procedures

Gypsum Plaster


Introduction:

This standard operating procedure enumerates the scope of Gypsum Plaster work to be executed in Tower area as specified in the approved drawings and at places when instructed by the Tower-in-charge.


Responsibility:

The respective Tower-in-charge is responsible to execute the work as per procedure.

Safety & protection:

Working space to be clear of debris so that easy access is ensured
Scaffolding to be checked for the load carrying capacity and ensure no overloading.

Lifting, manual transporting of materials have to be carried out by workers who are properly trained. Otherwise this may cause serious injuries to workers.

Throwing of debris from height strictly prohibited.

PPEs should be used properly.
 

Preparatory Works: 

All the nails, binding wire, masking tapes and wooden piece shall be removed from concrete surface.

All the dust, oil spots, and green algae, if any shall be cleaned from concrete and Blockwork surface with the help of wire brush.

Proper scaffolding shall be provided to allow easy approach to every part of the work. 

In no case, holes in Blockwork should be done for supporting scaffolding.

At place of work where sufficient natural daylight is not available, artificial light shall be made available.

Level pads of size 1 x 1 shall be made on the walls. 

Level pads shall also be checked for vertical alignment with the help of plumb bob, for right angle with the help of try square and for diagonal dimension of room with the help of tape.

Fiber mesh should be fixed on all concrete and blockwork joints (except base course joint). 

In case of level differences in adjoining surfaces, the same shall be made up before fixing of chicken mesh.

Ensure Concrete surface roughened for proper bonding.

All electrical chases shall be filled with cement mortar and properly rendered with non-shrink grout and application of fiber mesh over it. 

Curing should be done for 7 days before starting any type of plaster.

All the conduit drops shall be checked and concealed with plaster, if any visible in opening area.

All the ceiling points and wall points shall be checked for level and dimensions as per drawing or as per clients requirement if any. 

Ensure electrical boxes and light point boxes are in line with finish face of plaster.

Gypsum plaster thickness shall be restricted to 10 - 15 mm for walls and 6 to 8 mm for ceiling. 

If because of undulations the final thickness is expected to be more than 15 mm, back coat is recommended before applying Gypsum Plaster.

Back coat of 6 to 10 mm thick (cement sand mortar) shall be applied on Blockwork. 

Curing of Back coat shall be done for 7 days before starting gypsum work. 

Back coat shall be in rich 1:4 cement mortar.

After applying Back coat (wherever required if any) or after checking the thickness of gypsum plaster, Level strips of Gypsum shall be made through full height of wall and shall be checked for vertical alignment with the help of plumb bob, for right angle with the help of right angle and for diagonal dimension of room with the help of tape.

Level strips of Gypsum 6 wide shall be made on ceiling at wall  ceiling Junction and it should be checked for right angle.


Work Method: 

Gypsum plaster shall be applied only after back coat dries off completely.

Mixing of gypsum should be done in clean buckets/ trays as per proportions specified by manufacturer.

Old left out mix should not be used with new mix at any time.

The Gypsum shall be dashed against the prepared surface. 

The dashing of the coat shall be done using a strong whipping motion at right angles to the face of the wall.

The coat shall be led hard and tight forcing it to surface depressions to obtain a permanent bond and finished to smooth surface.

The finishing is made with the help of trowel and Metal straight edge.

Surface should be smooth after application and should be check for plumbs, right angles.

No chasing shall be done after application of final coat on walls /ceilings.

Electric switch boxes, fan boxes etc. shall be cleaned immediately after completion of plaster.

Floor should be cleaned on completion of days work.


Team 
CBEC India 

Aug 12, 2021

Electrical Work - Standard Work Procedure

Electrical Work


Introduction:

This standard operating procedure enumerates the scope of Electrical work to be executed in the Tower area as specified in the approved drawings and at places when instructed by the Tower-in-charge.

Responsibility: 

The respective Tower-in-charge is responsible to execute the work as per the procedure.

Safety & protection:


PPEs like safety belts at height, helmets, safety goggles, earplugs, and hand gloves, etc. should be used properly.
 
Ensure the working area is kept clean for easy access.

Proper illumination is to be provided during the work if required.

Educate the workmen through the pep-talk meetings. 
 

Work Method:


Slab Conducting:  

Customer changes shall be reviewed at the time of slab conducting work and changes should be incorporated.

Conduits for electrical work shall be fixed as per drawing and only after completion of reinforcement work completely.

A minimum 1-inch gap shall be kept between two conduits to ensure uniform concreting. 

In lobby areas keep the gap by bunching two conduits.

Ensure drops of beam light points and wall light points are not placed in the opening area.

For wall conduit points, ensure drop goes in the wall area by checking wall alignment in drawing (This will ensure no conduit projecting out from beam bottom on wall face after doing wall conducting).

Conduits should be fixed firmly by tying with reinforcement at the approx 1-meter intervals.

Check for uniform application of cement solvent at pipe joints and at bends.

Electrical and telephone conduit should have, a minimum distance of 150 mm between them.

Conduit shall be fixed with a minimum cover of 5mm.

Protection of ends of conduit, lightbox, and fan box shall be done to ensure no choke after concrete.


Wall Activity:

After De-shuttering, all electrical points should be opened and wire passing should be done. The wire should of GI 18 SWG.

Record the points which are choked and can't be rectified. Make a correction plan for the same.

After Completion of Blockwork and level pads for internal plaster, mark reference floor level on walls at 600mm from FFL.

Chase wall portion for fixing switch boxes by using a cutter, chisel, and hammer.

The switch box shall be fixed as per drawing, in line with internal plaster level pads on the wall and with the help of reference level.

Chasing for conduits on walls shall be done with the chasing machine only.

In case points are choked and are taken through the floor, the saddle clamp should be fixed at the wall and floor corner on both sides.

Filling of conduit chase shall be done by Blockwork contractor with cement mortar of 1:4 and it should be cured for minimum of 7 days.


Wiring and Fittings:

After Approval from Tower-in-charge, wiring activity should be started and done as per color coding shown on the drawing.

At the time of wiring, if any wall finish gets damaged, it should be shown to Tower-in-charge to ensure repairs.

Once the 2nd coat of putty is completed in the flat area or as per instruction from Tower-in-charge light fitting fixing should be started.

If the embedded box is damaged or the edge finishing around it is incorrect or the wall finish around the board is not in line then the switch plates or cover plates should not be fixed in position without rectifying the defect.

To connect wires on the switch as per color coding and as shown in the drawing.
 
Fix switch plates in position and check for their level and alignment.

Do fix cover plate on top of switch plates and check for its alignment and fitting.

In case a wall point is made on the wall by doing the local adjustment, check its feasibility by overlooking other finishes.

Void should not be seen around the cover plates, in case there is void it should be rectified by removing the switch plate. Do not allow local repair touch without removing it.

Do check operation of all switches and light point for their correctness, its responsibility of Electrical engineer to ensure wiring done correctly and all switches and light points are working correctly.


Team 
CBEC India

Aug 6, 2021

Internal Plaster Work - Standard Work Procedure

Internal Plaster Work


Introduction:

This standard operating procedure enumerates the scope of Internal Plasterwork to be executed in the Tower area as specified in the approved drawings and at places when instructed by the Tower-in-charge.


Responsibility:  

The respective Tower-in-charge is responsible to execute the work as per the procedure.

Safety & protection:

Working space to be clear of debris so that easy access is ensured.

Scaffolding to be checked for the load carrying capacity and ensure no overloading.

Lifting, manual transporting of materials have to be carried out by workers who are properly trained. Otherwise this may cause serious injuries to workers.

Throwing of debris from height strictly prohibited.

PPEs should be used properly.
 

Preparatory Works: 

All the nails, binding wire, masking tapes and wooden piece shall be removed from concrete surface.

All the dust, oil spots, and green algae, if any shall be cleaned from concrete and Blockwork surface with the help of wire brush.

Proper scaffolding shall be provided to allow easy approach to every part of the work. 

In no case, holes in Blockwork should be done for supporting scaffolding.
At place of work where sufficient natural daylight is not available, artificial light shall be made available.

Level pads of size not less than 2 x 2 shall be made on the walls and if required on ceiling also to serve as finished reference level surface. 

The distance between level pads shall not exceed 6 in any direction so that their surface alignment can be checked with the help of aluminum straight edge.

Level pads shall also be checked for vertical alignment with the help of plumb bob, for right angle with the help of right angle and for diagonal dimension of room with the help of tape.

Fiber mesh should be fixed on all concrete and blockwork joints (except base course joint). 

In case of level differences in adjoining surfaces, the same shall be made up before fixing of chicken mesh.

Ensure Concrete surface roughened for proper bonding.

All electrical chases shall be filled with cement mortar and properly rendered with non-shrink grout and application of fiber mesh over it. Curing should be done for 7 days before starting any type of plaster.

All the conduit drops shall be checked and concealed with plaster. If any visible in opening area.

All the ceiling points and wall points shall be checked for level and dimensions as per drawing or as per clients requirement if any. All electrical boxes and light points should be in line with finish face of plaster.

Ensure all electrical boxes are protected with plastic sheet packing before plaster.

Do wet the surface to receive plaster one hour before, so that while starting plastering, the surface is skin dry.


Work method for plastering: 

The mortar for plastering has to be prepared in Tray or on a firm or on metal sheets only.

Do prepare the mortar in clear area in proportion as follows;

Bond Coat / Key Coat  1:4 with 6mm fibers @ 100 grams per bag of cement (Strongplast)

Finish Coat  1:5 with 6mm fibers @ 100 grams per bag of cement (Strongplast).

Do mix mortar which can be consumed with in next 2 hours.

For kitchen and ducts plaster 100% Crush Sand should be use.

For toilets plaster Crush sand and river sand in 50:50 % proportions should be use.

Do add water to the dry mixed sand and binder (not otherwise).

While applying plaster on walls, empty cement bags shall be placed on floor near walls and rebounded mortar fallen on bags shall be put back into mixed mortar before it sets and 10% additional cement should be added in that mix and remixing should be done before its use.

Proper checking and supervision for plumb, line, right angle, measurement of openings after application of plaster should be done by site supervisor / engineer.

Electrical switch boxes shall be perfectly in line with plaster.

For Bond Coat / Key Coat curing should be done for minimum 3 days.

For finish Coat Curing should be done for minimum 10 days.

After completion of plaster clean the floor and all electrical boxes.


Team
CBEC India

Jul 30, 2021

Block Work - Standard Operating Procedure

BLOCKWORK


Introduction:

This standard operating procedure enumerates the scope of AAC Block masonry work to be executed in the Tower area as specified in the approved drawings and at places when instructed by the Tower-in-charge.


Responsibility:  

The respective Tower-in-charge is responsible to execute the work as per the procedure.

Safety & protection:

Blocks shall be stacked properly near the place of work (Do not stack too large quantity  near the work area thereby causing safety hazards)

The height of the stack should not be more than one and a half meters.

Scaffolding to be braced adequately
Working space to be clear of rubbish waste mortar etc so that easy access is ensured.

Scaffolding to be checked for the load-carrying capacity and ensure no overloading.

Material hoists should be checked for load carrying capacity and ensure no overloading. Material hoist third-party safety inspection reports should be submitted by the contractor before using the hoist for material shifting.

Lifting, manual transporting of blocks, etc have to be carried out by workers who are properly trained. Otherwise, this may cause serious injuries to workers.

Chasing in the blockwork has to be carried using appropriate cutting tools only. While chasing the worker must wear proper safety appliances like shoes, goggles, helmets, etc.

Throwing debris from height is strictly prohibited.

Before commencement of blockwork in front of the lift shaft safety permit should be taken.

CT props to be fixed in the front lift shaft to tie the safety belt.

Hard barrication to be cut only by gas cutting (If any anchored in concrete along the openings and edge of the building).
PPEs should be used properly.

Educate the workmen through the pep-talk meetings.


Preparatory works:

Ensure the availability of a detailed layout of the Flat showing room dimensions, the thickness of walls at various locations in the Tower, details of openings (with sizes) to be provided in the walls for doors, windows & other openings. Details of cross walls to ensure proper bond in main walls, location details of concealed items such as electrical conduits, telephone conduits, conduits for TV Antenna wires and cables, location details of items such as water supply pipes with details of the inlet, outlet, and crossings of service lines, sanitary pipes with details of the inlet, outlet and crossings of service lines, openings or holes for positioning of water closet p / straps, openings required for air conditioning ducts, pipe sleeves to be left in walls for other service pipes.

Do check for customer changes prior to execution of blockwork. 

 Starting the blockwork:

Scrub & clean the floor area with the proper tools, where blockwork is to be done.  

Mark the wall lines on the floor to get the proper layout of blockwork, check the clear height between the floor top and the beam bottom/slab bottom, where block work is to be done.

Decide on the thickness of leveling course mortar to avoid wastage/cutting of blocks at the top course and to maintain the gap of 10 to 15mm at top of blockwork. The thickness of leveling course mortar should not be more than 25mm.

Mix quantity of mortar, which will be consumed in the next 2 hours only. Mixing shall be done with proper measurements of ingredients in the proportion of 1:6 with pharma, where 1 part is cement and 6 parts is crush sand. The mixing platform/Tray must be clean. (If more quantity is mixed and will not be consumed within the time, cement will start setting leading to weaker masonry). 

Add water to the dry mix of cement crush sand in the required quantity.

Prepare a scheme of scaffolding, draw a sketch and pass on the same to Workers for execution. Ensure safety aspects such as stability, proper joints, etc. Check and ensure availability of scaffolding materials, access ladder or staircases, working platforms, etc. 


Blockwork base course, alignment & jointing:

Fix one block at both ends of the wall in level as per layout.

Blocks should be wet before placing to avoid absorption of water from mortar.

Carry out leveling course of blockwork with a dry bond (i.e. without mortar in the vertical joints, lay the blocks in position) by fixing line thread on end blocks. Use a piece of plywood to have uniform vertical joints.

Lay mortar for full bed width and for a length of 3 blocks at a time. 

Lay one block at a time & gently pressing it in the mortar bed. 

Excess mortar coming out on the edge (while pressing block in position in bed mortar) to be taken by trowel and reused.  
Use straight edge/spirit levels on top of the blocks laid & check the top level. 

Make sure that the spirit level is in working condition & read the bubble carefully.
Lay the last closure block in the course, to close the bond and locate it to be near the center of the wall normally. 

Check the layout of leveling course blockwork and then fill all vertical joints of blocks with cement mortar.

As soon as mortars in the joints have initially set, use a proper tool and strike the vertical joints first. The horizontal bed joints are to be raked next to a depth of 10 mm.

Curing to the base course should be done for the next 7days. 


Blockwork with Adhesive: 


After completion of the base course, Blockwork should be done with approved block adhesive. 

Block adhesive should be mixed thoroughly with water in the proportion specified by the manufacturer.

Block adhesive should be applied with an adhesive application trowel only to ensure uniform application.

Before starting the block fixing work above the base course, the positions of full and cut (required size) blocks should be finalized to ensure the staggered vertical joints are at least 6 and to minimize the wastage of blocks. This can be done by making elevation sketches/drawings for walls and pass on the same to Workers for execution.

The adhesive should be applied on both faces were block to RCC joint comes and on one face where block to block joints come.
Clean the surface of the block and apply adhesive on it from the end of the wall. Fix the block on adhesive by pressing it within 3 minutes.

For fixing the next block apply the adhesive on two sides (i.e.- the face of the block fixed earlier and at the top of the below block) and fix the block in position with the help of a wooden mallet. 

Each fixed block should be checked for its line, level, and plumb by a mason. 

The thickness of the adhesive is 3 to 4mm if not checked at the time of fixing will result in unleveled blockwork with the cavities in joints.

While fixing the block between two laid blocks, the adhesive should be applied on all three sides of the block.

Repeat the above points for building more courses.

All joints should be sealed from all sides while fixing blocks.

If the corners of blocks are broken then they should be filled and finished to the surface of the wall with cement mortar.

A clear gap of a minimum of 10mm should be left between the topmost layer and the RCC bottom.

This gap should be filled with very lean mortar and 10mm aggregates should be fixed on the surface. 

This is to prevent the cracks afterward in the wall plastering (due to the presence of different materials like block and RCC).

If the gap is bigger than 20mm the mortar with aggregate should be made to fill it.

In the double-wall area, an opening for water drainage and circulation of air should be made in chajja. After doing three layers of blockwork, ghotai to the chajja should be done with a slope towards the opening. Ghotai should be done on all sides of the box up to 300mm in height.


Height of Construction:

No part of the wall during construction shall raise more than one and a half meters above the general construction level.

Curing:

In hot & dry weather the mortar is likely to dry up before it has attained its final set in the blockwork. This leads to the crumbling of mortar and resulting in weak block masonry. This shall be prevented, by keeping the base blockwork layer constantly wet, for at least seven days. Blockwork is done with adhesive doesn't require curing.


Dos & Do not:

Do stack the blocks on a proper platform & clean surface. 

Do stack blocks at just a convenient location for immediate use. 

Do not overrule safety aspects to achieve timely completion.


Important Note: 

New masons should not be deployed directly on work without Training. The quality department will train the masons. On arrival of new masons at the site, information should be provided to the quality department by the respective Tower-in-charge.

Use Adhesive before its expiry date.


Team
CBEC India