Describe the procedure of water proofing used in slabs stating its importance in building construction.

Describe the procedure of water proofing used in slabs stating its importance in building construction.
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1 Answer

Answer :

Following is the stepwise procedure effectively applied in treatment of brick bat coba. 


1 All existing treatment or coating on roof slab top is initially removed and surface is cleaned by hard wire brush and washed with water. In case of new R.CC. roof slab, its surface is broomed or cleaned properly. Note that, the surface should be free from any oil, grease, dust etc. 


2. All non-structural cracks greater than 0.5 mm wide and construction joints if any, should be cut in V shape and these cutting portion in V-shape is cleaned with wire brush and washed. Then cracks are filled by polymer or modified cement or mortar using acrylic polymer. Then cement slurry mix is spread over the cleaned roof surface. Then a layer of cement sand mortar with a proportion of 1: 4 with waterproofer is laid over the 15 mm thick cement slurry already applied over the roof surface. 


3. Then a layer of brick bats, soaked overnight in water are laid on the layer of cement mortar (1:4 proportion). Average thickness of the layer of brick bats is about 110 mm and it is about 70 mm near rain water pipe and 150 mm at ridge. 


4. The gaps between the brick bats are generally kept in between 15 mm to 20 mm. These gaps are filled with cement mortar having proportion of 1:4 admixed with waterproofed. 


5. After performing the work mentioned in step 4 curing should start next day and it should be done for 7 days Curing should be done by ponding method. 


6. After the curing of 7 days, the top surface is finished smooth with 20 mm thick cement sand mortar having proportion of 1: 4 admixed with a water proofer. Curing is started from next day and continued for 14 days. It should be done by ponding method. Note that, all liquid admixtures should be mixed with water. Then this finished smooth green surface is marked with 300 mm false squares The curing is done on next day. 

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