Method Statement Water Proofing

SKANDHANSHI INFRA PROJECTS PVT LTD

Method Statement METHOD STATEMENT

FOR WATER PROOFING WORK

Prepared for: SIPIL PROJECTS Document Reference number: SIPIL-MST-CI-000. REV.00

Prepared by: VINOD MASANI- QA/QC ENGINEER. Revision history Revision

Date

00 Checked by

00.00.2020 P.UMA MAHESH I have checked this document for its layout and format, and to meet project requirements.

Reviewed by

Reviewed by

Authorized by

Approved by

Additions/modifications Title Initial Submission

Signature

Date

QA/QC Manager

D.SRINIVASA RAO I have reviewed this document for its accuracy and technical content, and to meet project requirements.

AGM

B.ANIL KUMAR I have reviewed this document for its accuracy and technical content, and to meet project requirements.

GM

N. NAGENDRA PRASAD I have authorized this document for implementation.

CCO

M.SURESH KUMAR REDDY I have approved this document for implementation.

MD

Page 1 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD Contents 1.

PURPOSE AND SCOPE OF WORK:.........................................................................3

2.

RELATED DOCUMENTS / REFERENCES:.............................................................3

3.

PRODUCTS REQUIRE:..............................................................................................3

4.

TOOLS & EQUIPMENT’S REQUIRE:....................Error! Bookmark not defined.

5.

SEQUENCE OF ACTIVITIES..................................Error! Bookmark not defined.

6.

QUALITY CONTROL...............................................Error! Bookmark not defined.

7.

SAFETY HAZARDS AND PRECAUTIONS...........Error! Bookmark not defined.

1. PURPOSE AND SCOPE OF WORK: The purpose of this method statement is to describe the method of works and detailed sequence of water proofing works. The scope of this method statement includes, surface Preparation & method of water proofing systems at “SKANDHANSHI INFRA PROJECTS”, while executing it in accordance with technical specifications.

Page 2 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD 2. Related documents / references:  Approved drawing (GFC) & Check list.  Project Technical Specification  Approved materials. 3. Products require: 3.1.1 Approved bricks 3.1.2 Sand 3.1.3 Cement 3.1.4 Accessories (water proof chemical ) 3.1.5 Water 3.1.6 Bonding Agent 3.1.7 Rough Shahabad stones or equivalent stones from quarry 3.1.8 12.5 mm coarse aggregate or specified coarse aggregate by QA/QC. 3.1.9 Fly ash (if specified by QA/QC). Raw Materials used in Waterproofing & its Acceptance Criteria Cement: 

Cement shall be 43 / 53 grade OPC (Fly ash shall be used with OPC) / PPC and not more than 8 weeks old and it shall be free of lumps.

Natural sand: 

Silt content of natural sand shall not exceed 12% by volume for 1 Hr and 8% by volume for 2Hrs. Percentage passing 600 micron shall be more than 45%.

Fly ash:  

Sources of fly ash must be standardized as per test reports and fly ash must meet the requirements of IS 3812. Further retention on 45 micron sieve after wet sieving should be less than 20%. Fly ash should be free from lumps.

Bricks: Bricks from which brick-bats are made shall not be under burnt and percentage of over burnt bricks shall not be greater than 10%. Bricks used for brick bats shall be either be full bricks or 3/4 th bricks. Bricks shall be broken at site with the help of mallet. Irregular broken pieces of bricks shall not be used. Page 3 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD Water: Sulphate and Chlorides content in the water shall be within specified limits as specified in IS-456:2000. Water proofing compound: A water proofing compound of reputed manufacturer shall be used. Care shall be taken to see that it is compatible with the type / brand of cement being used. Packing shall clearly bear date of manufacturing, lot number, date of expiry, usage guidelines etc. Bonding Agent: Suitable bonding agent from the reputed manufacturer shall be used.

4. Tools and Equipment’s Require:                            

Measuring tapes (steel)Plumb bob Mason trowel Sponge Wheel barrow angle grinders brooms brushes & wire brushes caulking guns chisels, including cold chisels cutting blades Tube level, auto level. electric drills and screwdrivers extension leads fusion rollers Hoses moisture meters nylon rollers pumps impact drills pressure injection equipment Hammer & chisels Sieving machine or sieves Hoe Drilling machine Mortar pan Measuring boxes / gauge boxes GI Tray Calibrated tin for water Page 4 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD  

Water drums / containers Mixer machine

1. Waterproofing of Toilets 2. Waterproofing of Terraces 3. Waterproofing of Retaining walls 4. Waterproofing of utilities Toilets without sunken & balconies 5. Waterproofing of O.H.T, sump & septic tank

1. Waterproofing of Toilets Pre Waterproofing activities: 

It shall be ensured that toilet plumbing lines are installed in masonry and chases are rendered with non- shrink grout prior to cleaning activity of sunken is undertaken.



The inner sides of the cut-outs in the RCC element should be hacked and should be free from dust and debris.



If any reinforcement rods projected from sunken slab, that reinforcement rod to be trimmed 20 mm below sunken slab level & GP 2 filling to be done at that area.



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



Injection grouting at all major honeycombed portions shall be carried out, if necessary, after physical observation of the sunken.



All construction joints, cracks or identified weak areas should be suitably treated.



Ponding to be done, to test for leakages and to serve water hungry concrete surface.



In case of major leakage, gravity grouting or pressure grouting shall be resorted to stop leakages.



Holes for PVC and other outlet pipes shall be marked clearly for size and locations. Outer surface of PVC pipes shall be roughened for better bonding. Diameter of hole shall not exceed pipe diameter. Page 5 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD 

Levels of water-proofing (1 feet from F.F.L or specified by QA/QC) shall be clearly marked on the toilet walls with slope towards outlet, as specified in drawing or minimum 1:100 ratio otherwise.

During Waterproofing Procedures: 

Application of chemical waterproofing coat (crystalline / elastomeric / polymer or as specified by QA/QC) can be done, if required to entire sunken portion before base coat.



Mix MYK AQUAARM TG/TOP GUARD powder of 30 kg bag with 10 lit liquid and further to this mix adds 4.8 to 5.5 Liters of water and all this items to be mixed thoroughly. Before applying the MYK AQUAARM TG/TOP GUARD sprinkle the water, applying the surface area so that surface should be made wet. (Chemical agent may change as per QA/QC if necessary.)



Apply first coat of water proofing chemical with MYK AQUAARM TG/TOP GUARD and after 3 hours apply the second coat over the first coat. (Chemical agent may change as per QA/QC if necessary.)



Polymer modified cementitious coating system applied in 2 coats at a total consumption of 1.5 kg/sqm on the surface. (Chemical agent may change as per QA/QC if necessary.)



Maximum thickness of Protective coat should be 25 mm at the higher end of the slope.



Base coat using cement mortar in proportion 1:4 or as specified by QA/QC Department with approved water- proofing compound shall be applied over top of base slab of sunken portion.



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. 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.



Drain spout shall be 20 mm / 25mm diameter GI / UPVC, fixed so as to project at least 4” beyond wall surface. Drain spout mouth shall be cut to the shape of half nozzle by cutting at 30º angle to facilitate water dropping in the form of a projectile. Holes for drain pipes should be done before starting any type of waterproofing.



Drain pipe mouth shall be fitted with PVC grating or filter media form inside and chicken mesh / wire mesh from outside.



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. Page 6 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD 

Floor traps and other plumbing lines shall be installed in brick masonry after application of base coat.



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.



Rendering of holes shall be done using compatible (epoxy bonding) bonding agents; SBR based expansive grouts, waterproofing compounds (or as specified by QA/QC) and M15 grade concrete.

   

All internal drain lines shall be erected as per layout given on the drawing and shall be pressure tested. G.I. pipe spout should be fixed along with the base coat as additional precautionary measure against water seepages occurring by chance. Application of brick bat coba shall be started, once plumbing lines are satisfactory pressure tested. Bricks selected for using as Brick Bat Coba shall be either full brick or 3/4 th brick made out of one complete brick by breaking into required size, using mallets. Brick bat shall not be stored in the form of a heap at one place and soaked thoroughly for about 15 minutes prior to their placing.



Use of plasticizer in mortars is recommended to increase workability. Mortar mixed shall be used within 1 Hour of preparation.



Mortar for water proofing should be compulsorily mixed in mechanical mixers using natural sand only



Presoaked 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. Thickness between adjacent layers of brickbats shall not exceed 25mm.



Application of brick-bats shall proceed from one corner and shall be laid in radial pattern / straight pattern to drain of any water which has seeped through. Thiyyas for the same shall be given by Site Engineer, considering into account adequate slope.



Edge rounding’s (haunch) shall be done simultaneously at corners. (Junction of slab & wall)



The brickbat Layer shall then be cured for minimum 3 days by ponding



After curing is over, the surface shall be applied with a finishing coat of cement sand mortar in the proportion 1:3 with water-proofing compound till top of brick-bats.



Top coat shall be of neat cement slurry of adequate consistency and shall be monolithic with brickbats.



Finished surface shall then be cured for at least 7 days by ponding and then tested for leakages, if any. Page 7 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD

Post Waterproofing Procedures:  Date of finishing shall be marked on the surface for curing by ponding for about 7 days. Important 

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.

Waterproofing of Common / Open Terrace (Brick Bat Coba) Pre Waterproofing Procedures: 

All surfaces to be waterproofed shall be cleaned off all loose materials, mortar, oil, grease, if any, thoroughly by wire brush. It shall be ensured that parapet plasters are completed prior to cleaning activity is undertaken. Plaster shall be cut at one level, i.e. 1’ above terrace slab top.



Haunching to be done with minimum of 40-70mm diameter at the corners.



Injection grouting shall be adopted at all major honeycombed portions, if necessary, after physical observation of slab.



Terrace slab shall be cured for at least 2 days by ponding to test for leakages and to serve water hungry concrete surface.



Ponding shall be done in areas of 5 sq. m each by forming bunds of 2” in height and cast in cement mortar 1:10 approx.



In case of major leakages, gravity grouting or pressure grouting shall be resorted to, to stop leakage.



Levels of water-proofing shall be clearly mark on concrete surface, clearly defining ridge line and valley lines with level pads underneath, minimum slope being 1:100 or as that mentioned in Page 8 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD drawing. Holes for outlet pipes shall be marked clearly for size & locations and chasing shall be done thereafter. 

Hole diameter shall not exceed pipe diameter. Rendering of holes shall be executed using compatible bonding agents, (SBR based) expansive grouts, waterproofing compound and M15 grade concrete.



Rain water pipes shall be fixed at the required locations as per drawing. In case of PVC pipes, surface of pipes shall be roughened and applied with sand for proper bonding and P.V.C. grating shall be provided at the pipe mouths.



Mix MYK AQUAARM TG/TOP GUARD powder of 30 kg bag with 10 lit liquid and further to this mix adds 4.8 to 5.5 Liters of water and all this items to be mixed thoroughly. Before applying the MYK AQUAARM TG/TOP GUARD sprinkle the water applying the surface area so that surface should be made wet. (Chemical and may change as per QA/QC if necessary.)



Apply first coat of water proofing chemical with MYK AQUAARM TG/TOP GUARD and after 3 hours apply the second coat over the first coat. (Chemical agent may change as per QA/QC if necessary.)



It shall be ensured that no water carrying pipes are running over the slab, which is to be waterproofed.



Materials required for only 2 days of water-proofing works shall be carried to avoid unnecessary loading of terrace slab.

During Waterproofing Procedures: 

Bricks selected for using as Brick Bat Coba shall be either full brick, or 3/4th brick made out of one complete brick by breaking into required size, using mallets.



Brick bat shall not be stored in the form of a heap at one place. Page 9 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD 

They shall be soaked thoroughly for about 15 minutes prior to their placing.



After cleaning the slab, a thin layer of cement slurry shall be laid on cleaned slab prior to laying of brick bats.



Thickness of mortar bed should not exceed 40mm below the brick bats.



Over this, maximum 40 mm thick layer of cement sand mortar in the proportion 1:3 mixed with compatible water-proofing compound shall be laid. Mortar shall be preferable mixed in mechanical mixer only or as specified by QA/QC. Also use of plasticizer is recommended to increase workability. Mortar prepared shall be used within 1 Hour of preparation.



Presoaked brick-bats shall then be laid in radial, by inserting brick-bats to a depth of about 15mm by light tamping with the help of adjacent layers of brickbats shall not exceed 25mm.



Application of brickbats shall proceed from one corner and shall be laid in radial pattern to drain of any water which has seeped through. Thiyyas for the same shall be given by Site Engineer, considering into account adequate slope. For this purpose line Doris shall be fixed at every 3’ to define the slope. Brick-bats shall be laid accordingly.



Edge rounding’s (haunch) shall be done simultaneously so that bottom edge of parapet wall plaster serves as drip mould.



The entire brick bat layer should be cured of minimum 3 days.



After curing is over, the surface shall be applied with a finishing coat of cement sand mortar in the proportion 1:3 with water-proofing compound.

  

Top coat shall be of neat cement slurry of adequate consistency and shall be monolithic with brick-bats. Surface shall be finished with 3’ long float or as specified by QA/QC , polish patra and line dori to mark grids of 1 X 1 sq. ft. markings or as specified by QA/QC. Finished surface is then tested for leakage by ponding. Ponding is done making mortar bunds of height 1” at every 5 feet. Testing shall be carried out for 7 days.

Post Waterproofing Procedures: Page 10 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD



Date of finishing shall be marked on the surface for curing by ponding for about 7 days.

Important 

Waterproofing once done, shall not be broken, or pierced. If waterproofing 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 grout.

Waterproofing of Retaining walls Pre Waterproofing Procedures:   

    

All construction joints, cracks or identified weak areas should be suitably treated. V-groove should be made along the length of construction joints, cracks and weak areas. A nozzle to be fixed and Grouting to be done through nozzle by cement slurry grout admixed with ARMGROUT ADD/CEBEX 100 expandable grout additives @250/225 gms per bag of cement, to full saturation using pressure grouting at a minimum of 40 PSI should be done. (Chemical agent may change as per QA/QC if necessary.) The grooved area should be sufficiently saturated with water before grouting. Cleaning the tie rod holes and removing PVC pipes minimum 30-40mm from the face of the RCC wall. Filling the tie-road holes by cement mortar admixed with ARM GROUT NS 65/REARM INSTA PLUG/RENDEROC PLUG. (Chemical agent may change as per QA/QC if necessary.) Cleaning and removing lose materials from the surface Mix MYK AQUAARM TG/TOP GUARD powder of 30 kg bag with 10 lit liquid and further to this mix adds 4.8 to 5.5 Liters of water and all this items to be mixed thoroughly. Before applying the MYK AQUAARM TG/TOP GUARD sprinkle the water applying the surface area so that surface should be made wet (chemical agent may change as per QA/QC if necessary.)

During Waterproofing Procedures:  

The system of application to the surface can be done by using stiff bristled brush or a roller. Apply first coat of water proofing chemical with MYK AQUAARM TG/TOP GUARD (chemical Page 11 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD

  



agent may change as per QA/QC if necessary.) and after 3 hours apply the second coat over the first coat. The direction of second coat should be perpendicular to the direction of application of the first coat. Polymer modified cementitious coating system applied in 2 coats at a total consumption of 1.5 kg/sqm on the surface. Laying water proofing plastering over polymer coat with Cement Mortar (1:3) of thickness 2025mm on the wall with water proof admixture (AQUAARM PROOF WP10) @ 150 ml per bag of cement. Curing for 2 days by water sprinkling (after 24 hours of application). (Chemical agent may change as per QA/QC if necessary.) Thickness must be in specified limits as per work order to projects.

4. Waterproofing of utilities, Toilets without sunk & balconies Walls:  Cleaning the joints between the flooring and walls carefully and providing and installing the Coving Page 12 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD Bandage to the area to overlap the joint for prevention of seepage.  Cleaning the toilet wall areas thoroughly and applying two coats of flexible cementatious membrane or equivalent Chemical Waterproofing System as per manufacturer’s specification to further receive coat of plaster.  Providing and applying one coat of plaster Cement Mortar 1:4 of 25mm thick and adding appropriate waterproofing compound and curing the same thoroughly. Pre Waterproofing activities: 

It shall be ensured that toilet plumbing lines are installed in masonry and chases are rendered with non- shrink grout prior to cleaning activity of sunk is undertaken.



The inner sides of the cut-outs in the RCC element should be hacked and should be free from dust and debris.



If any reinforcement rods projected from sunk slab, that reinforcement rod to be trimmed 20 mm below sunken slab level & GP 2 filling to be done at that area.



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



Injection grouting at all major honeycombed portions shall be carried out, if necessary, after physical observation of the sunk.



All construction joints, cracks or identified weak areas should be suitably treated.



Ponding to be done, to test for leakages and to serve water hungry concrete surface.



In case of major leakage, gravity grouting or pressure grouting shall be resorted to stop leakages.



Holes for PVC and other outlet pipes shall be marked clearly for size and locations. Outer surface of PVC pipes shall be roughened for better bonding. Diameter of hole shall not exceed pipe diameter.



Levels of water-proofing (1 feet from F.F.L or specified by QA/QC) shall be clearly marked on the toilet walls with slope towards outlet, as specified in drawing or minimum 1:100 otherwise.

During Waterproofing Procedures: Page 13 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD Flooring: 

Cleaning the joints between the flooring and walls carefully and providing and installing the Coving Bandage to the area to overlap the joint for prevention of seepage.



Cleaning the toilet surface of the floor thoroughly and applying two coats of flexible cementitious membrane or equivalent Chemical Waterproofing System as per manufacturer’s specification.



Mix MYK AQUAARM TG/TOP GUARD powder of 30 kg bag with 10 lit liquid and further to this mix adds 4.8 to 5.5 Liters of water and all this items to be mixed thoroughly. Before applying the MYK AQUAARM TG/TOP GUARD sprinkle the water applying the surface area so that surface should be made wet. (Chemical agent may change as per QA/QC if necessary.)



Apply first coat of water proofing chemical with MYK AQUAARM TG/TOP GUARD and after 3 hours apply the second coat over the first coat. (Chemical agent may change as per QA/QC if necessary.)



Polymer modified cementitious coating system applied in 2 coats at a total consumption of 1.5 kg/sqm on the surface. (Chemical agent may change as per QA/QC if necessary.)

 



Providing and laying Screed in Cement Mortar 1:4 of 25mm thick for protection of the membrane. 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. 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. Drain spout shall be 20 mm / 25mm diameter GI / UPVC, fixed so as to project at least 4” beyond wall surface. Drain spout mouth shall be cut to the shape of half nozzle by cutting at 30º angle to facilitate water dropping in the form of a projectile. Holes for drain pipes should be done before starting any type of waterproofing.



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 in screed after application of base coat.



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.



Rendering of holes shall be done using compatible (epoxy bonding) bonding agents; SBR based expansive grouts, waterproofing compounds (or as specified by QA/QC) and M15 grade concrete. Page 14 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD 



All internal drain lines shall be erected as per layout given on the drawing and shall be pressure tested. G.I. pipe spout should be fixed along with the base coat as additional precautionary measure against water seepages occurring by chance. Edge rounding’s (haunch) shall be done simultaneously at corners. (Junction of slab & wall)



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



Post Waterproofing Procedures: 

Date of finishing shall be marked on the surface for curing by ponding for about 7 days.

5. Waterproofing of O.H.T, sump & septic tank

Pre Waterproofing Procedures:  All construction joints, cracks or identified weak areas should be suitably treated.  V-groove should be made along the length of construction joints, cracks and weak areas.  A nozzle to be fixed and Grouting to be done through nozzle by cement slurry grout admixed with ARMGROUT ADD/CEBEX 100 expandable grout additives @250/225 gms per bag of cement, to full saturation using pressure grouting at a minimum of 40 PSI should be done. (Chemical agent may change as per QA/QC if necessary.)  The grooved area should be sufficiently saturated with water before grouting.  Cleaning the tie rod holes and removing PVC pipes minimum 30-40mm from the face of the RCC wall.  Filling the tie-road holes by cement mortar admixed with ARM GROUT NS 65/REARM INSTA PLUG/RENDEROC PLUG. (Chemical agent may change as per QA/QC if necessary.)  Cleaning and removing lose materials from the surface  Mix MYK AQUAARM TG/TOP GUARD powder of 30 kg bag with 10 lit liquid and further to this mix adds 4.8 to 5.5 Liters of water and all this items to be mixed thoroughly. Before applying the MYK AQUAARM TG/TOP GUARD sprinkle the water applying the surface area so that surface should be made wet (chemical agent may change as per QA/QC if necessary.)

During Waterproofing Procedures:  

The system of application to the surface can be done by using stiff bristled brush or a roller. Apply first coat of water proofing chemical with MYK AQUAARM TG/TOP GUARD (chemical agent may change as per QA/QC if necessary.) and after 3 hours apply the second coat over the first Page 15 of 16

SKANDHANSHI INFRA PROJECTS PVT LTD

  



coat. The direction of second coat should be perpendicular to the direction of application of the first coat. Polymer modified cementitious coating system applied in 2 coats at a total consumption of 1.5 kg/sqm on the surface. Laying water proofing plastering over polymer coat with Cement Mortar (1:3) of thickness 2025mm on the wall with water proof admixture (AQUAARM PROOF WP10) @ 150 ml per bag of cement. Curing for 2 days by water sprinkling (after 24 hours of application). (Chemical agent may change as per QA/QC if necessary.) Thickness must be in specified limits as per work order to projects.

Page 16 of 16