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precautions to avoid water seepage through concrete roof

Sun Mar 23, 2014Total posts : 2
viju
viju
Join date: Feb 2014
Topic: precautions to avoid water seepage through concrete roof

I am building a 2 storey house. I have a Main wall which is adjacent to an existing house and the ground floor roof will connect to the existing roof.

I can't plaster one side of the wall because there is only 30cm gap between existing house and new one , even though the roof will comes as single, is there any chance of seepage of water through the roof joint where we connect the existing house and new house.

I am concerned that if rain comes will it result in seepage.

Is there any precautions for this.

Attachments: _ IMG_3304.JPG on Sun Mar 23, 2014, 
_ IMG_3318.JPG on Sun Mar 23, 2014, 
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Tue Mar 25, 2014Post  #1
Abhishek Garg (Builder & Engineer)
Abhishek Garg (Builder & Engineer)

Join date: Apr 2013
Dear Viju: Use waterproof additive in the concrete of the roof slab. After the roof slab is laid and water cured, lay 2 rows of brick on the main wall (the wall mentioned in your query) and put additional concrete in the 30 cm gap to create a channel in slope to drain the rain water towards front or back. Give a slope of atleast 1 inch for each 10 feet in length of the wall. Secondly before further bricks rows are added on this wall, apply two coats of waterproof over this concrete channel as well as the outer surface of the brick rows laid. You may then continue the brickwork till the next roof level.
I hope it helps.  
 
Sat Apr 12, 2014Post  #2
viju
viju

Join date: Feb 2014
Thnx, will do that ...
 

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