Work Method Statement for Various Types of Waterproofing

[Srinivasan]

Work Method Statement for Various Types of Waterproofing
SCOPE / PURPOSE
This work procedure narrates the guidelines for carrying out Water proofing treatment for all BOQ items listed under the Contract

CODES / SPECIFICATION
Tender/Contract Specifications BOQ description
IS 2645 Specification for Water proofing compound

RESPONSIBILITY
Responsibilities of all concerned is clearly mentioned with respect to overall administration and implementation in the approved Organogram.

MATERIALS TO BE USED
Brickbat,
Cement,
Waterproofing Compound.

SAFETY REQUIREMENT

• Ensure that workers are wearing gumboot & rubber hand gloves during brick bat coba water proofing treatment.
• Ensure that the material handling should be done in a proper manner by crane/passenger hoist/manual.
• Provide proper safety arrangements & barricading to the outer edge of water proofing treatment area like chajjas, flower bed etc.
• Provide proper access to workman to reach the workplace on roof. Ensure workmen are working with Personal Protection Equipment's.
• Educate the workmen with all safety rules and regulations especially for working at height / at edge part of the building like chajja etc.

DEPLOYMENT OF EQUIPMENT
Crane, Multistage Pump, Grouting Pump, Passenger Hoist

DEPLOYMENT OF MANPOWER
As per the requirement and the direction of project manager.

IMPLEMENTATION
BOX TYPE WATER PROOFING-Horizontal (40 mm Thick):

• Clean the surface by broom.
• Clean the surface by Wire/Coir brush to remove all laitance, loose particles, loose concrete lumps & oil stains etc. Wash the surface with water Jet.
• All construction joints to be chipped by making V – Groove up to a depth of 25 mm and the same to be filled with 1:3 cement – sand mortar with approved cement waterproofing compound (200 ml / 50 kg of cement). Prior to do above activity, Acrylic polymer 1:1(Cement & polymer) should be applied on chipped surface as a Bonding Coat.
• Place the cement slurry mixed with waterproof cement compound, which penetrates into lean concrete and fills porous areas.
• Fix 20 mm dia MS pipe socket on floor as specified in drawing / wherever required.
• After 24 Hrs Grout the socket with cement slurry mixed with approved waterproofing cement compound (200 ml / 50 kg of cement).
• Apply 10 mm thick 1:3 cement-sand mortar with Polymer (200 ml / 50 kg of cement) as base coat. Embed stone chips of 12 mm down in the laid mortar.
• Over base coat, place 15-20 mm thick rough finished low porosity stone slabs (Shahabad stone) by keeping minimum 15 mm gap in between stone slabs. After 3-4 Hrs. gap of stone to be racked out. Fill the joints between the stone slabs with cement grout mixed with Polymer (200 ml / 50 kg cement).
• After 24 Hrs. apply 10 mm thk. Protective coat over it by 1:3 cement-sand mortars with Polymer (200 ml / 50 kg of cement).
• After 24 Hrs. Flood the treated area with water for 7 days.

BOX TYPE WATER PROOFING –

• Vertical (30mm Thk.): Hack the surface on random basis.
• Clean the surface by Wire/Coir brush to remove all laitance, loose particles, loose concrete lumps & oil stains etc.
• Wash the surface with water Jet.
• Fix 15 mm thick rough porous stone slabs with the help of cement paste applied on internal face of stone slabs, having a gap of 15 mm between the external face of the RCC Structure and internal face of the slabs. The stone slabs are to be fixed side by side without leaving any gap between the edges. Maximum of 1200-1500 mm vertical layers of stone to be laid at a time.
• Fill the gap between RCC structure and stone layer with cement grout mixed with Polymer (200 ml /50 kg of cement).
• Apply 12 mm thk. Cement – sand mortar plaster with approved water proofing cement compound (200 ml / 50 kg of cement) over stone slab as protective coat.
• After curing period, fix 20 mm dia. MS pipe where ever it required from inside & grout each socket with cement slurry mixed with waterproofing cement compound.

BRICK BAT COBA WATERPROOFING (average 150 mm thick.):

• Clean the surface by broom.
• Clean the surface by Wire/Coir brush to remove all laitance, loose particles, loose concrete lumps & oil stains etc.
• Wash the surface with water jet.
• Seal all outlets & test the leakage if any by ponding method.
• All construction joints to be chipped by making V – Groove upto a depth of 25 mm and the same to be filled with 1:3 cement – sand mortar with approved cement water proofing compound (200 ml / 50 kg of cement )
• Mark the required level as per slope given in reference drawings on permanent structure like parapet wall / slab. Ensure the thickness of entire treatment should not be less than 75 mm thick at zero slope ends.
• Lay 1:3 cement sand mortar thoroughly mixed with approved cement water proofing compound (200 ml / 50 kg of cement).
• Lay immediately brick bats over the mortar laid already. Ensure that the brick bats to be soaked in water before using it and the gap between brick bats should be 12 mm – 15 mm.
• After 24 Hrs, Flood the terrace with water for 2 days.
• Then dewater the terrace and fill the joints of brick bat by 1:3 cement sand mortar thoroughly mixed with approved cement water proofing compound (200 ml / 50 kg of cement).
• Lay the same type of mortar on the top of brickbats, (Minimum 25 mm thick) and trowel it properly to achieve desired slope.
• Make top surface smooth by vigorous trowelling with false marking of 300 mm squares by twin thread.
• Provide 300 mm vata over finished waterproofing.
• After 24 Hrs, Seal all outlets and flood the terrace for ten days. Ensure that there is no leakage / seepage at the soffit of treated roof.

WATER PROOFING TREATMENT TO SUNK FLOORS (Average 125 mm Thick)

• Clean the sunk surface by broom.
• Clean the sunk surface by Wire/Coir brush to remove all laitance, loose particles, loose concrete lumps & oil stains etc.Fill the sunken surface with water to check any leakage by ponding method.
• All construction joints to be chipped by making V – Groove upto a depth of 25 mm and the same to be filled with 1:3 cement – sand mortar with approved cement water proofing compound (200 ml / 50 kg bag of cement ).
• Fix 20 mm dia MS pipe socket on floor at where ever it required.
• After minimum 24 hrs. grout the socket with cement slurry mixed with approved water proofing cement compound (200 ml / 50 kg of cement), by means
• of pressure grouting pump upto it’s saturation level.
• Apply cement slurry on floor.
• Lay 10 mm thk.1:3 cement sand mortar thoroughly mixed with approved cement water proofing compound (200 ml / 50 kg of cement ) as a base coat on floor and wall.
• After 24 Hrs. fill the sunk with water for 3 days.
• Fill the sunk slabs with brick bat coba water proofing treatment as described in A.3.3 of this procedure for average thickness of 100 mm.
• Lay average 15 mm thk. 1:3 cement-sand mortar with approved waterproofing cement compound (200 ml / 50 kg of cement). Keep top of finish surface rough to receive tile/stone over it.
• After 24 Hrs flood the sunk with water for 7 days.

WATERPROOF PLASTER ON WALLS (12 mm thick.):

• Clean the surface by broom and hack it randomly.
• Clean the surface by Wire/Coir brush to remove all laitance, loose particles, loose concrete lumps & oil stains etc.
• Wash the surface with jet water.
• All construction joints to be chipped by making V – Groove upto a depth of 25 mm and the same to be filled with 1:4 cement – sand mortar with approved cement water proofing compound (200 ml / 50 kg of cement).
• Apply 12 mm thick 1:4 cement-sand mortar with approved waterproofing cement compound (200 ml / 50 kg of cement).
• Provide minimum 7 days curing over it with wet surface method.

WATERPROOFING ON TERRACE (average 150 mm thick)
This will stand same as procedure described under brick bat except thickness of various stages which are narrated as below.
(i) Average thickness of base coat – 25 mm. ( Minimum 3 days Curing )
(ii) Average thickness of brick bat coba treatment – 100 mm
(iii) Average thickness of finish coat – 25 mm. With white china mosaic tile over it. After finish coat fill the area with water for 15 days.

WATERPROOFING ON CHAJJAS, FLOWER BOX(Average 20 mm thick)

• Clean the surface by broom and hack it randomly.
• Clean the surface by Wire/Coir brush to remove all laitance, loose particles, loose concrete lumps & oil stains etc.
• Wash the surface with jet water.
• All construction joints to be chipped by making V – Groove upto a depth of 25 mm and the same to be filled with 1:4 cement – sand mortar with approved cement water proofing compound (200 ml / 50 kg of cement )
• Fix 20 mm down aggregate on mortar at junction of horizontal & vertical surface and after that make vata over it.
• Apply average 20 mm thk.(over all), 1:4 cement-sand mortar with approved waterproofing cement compound (200 ml / 50 kg of cement ) and lay white china mosaic tiles over it as per drawing/specification.
• Provide minimum 7 days curing over it with wet surface method.

WATERPROOF PLASTER TO INTERNAL WALLS OF O.H. & U.G. WATER TANK AND LIFT PITS (12 mm thick)

• Clean the surface by broom and hack it randomly.
• Clean the surface by Wire/Coir brush to remove all laitance, loose particles, loose concrete lumps & oil stains etc.
• Wash the surface with jet water.
• All construction joints to be chipped by making V – Groove upto a depth of 25 mm and the same to be filled with 1:4 cement – sand mortar with approved cement water proofing compound (200 ml / 50 kg of cement )
• Fix 20 mm dia MS pipe socket on floor and wall Junction .
• After minimum 24 hrs, grout the socket with cement slurry mixed with approved water proofing cement compound (200 ml / 50 kg of cement ), by means of pressure grouting pump up to it’s saturation level.Apply 12 mm thk., 1:3 cement-sand mortar with approved waterproofing cement compound (200 ml / 50 kg of cement). Provide vata ( if required ) at junction of vertical & horizontal surface.
• Provide minimum 7 days curing over it with wet surface method.

INSPECTION AND TEST PLAN
Maintaining records for the consumption of materials & the details about the area treated in separate register on day to day basis.
Maintaining records for all the stages of activities done on day-to-day basis, for each building / area wise.

 

[Laxmimanohar]

sir,
please clarification in waterproofing on terrace floor- apartments before used brickbat materials used, but present some others used AAC block used it is suitable or not