drain waterproofing

[lunct]

For drains where there are pvc tube inside concrete.. what do you use for waterproofing to ensure water won't enter the sides (in between the pipe and concrete)? We usually use asphalt membrane enclosing the tube end on surface of drain but we can't use it in a particular case. Is there some kind of bonding or waterproof liquid you can put around the drain so water won't seep in the perimeter?

 

[Canuck65]

Normally we specify that a small reglet be cast or cut into the top of the concrete surface immediately beside the drain body. This reglet is then filled with polyurethane sealant to seal between the concrete and the drain body.

 

[lunct]

In my country. All use torch-on sheet waterproofing membrane like in

http://s3tasia.com/product/bituminous-membrane/

This is expensive, and most said this is the only way to enclose the drain hole like in the picture above. Do you use this too? Why not? and besides cutting a reglet beside the drain to put sealant (can you do this after the pvc pipe is in place.. won't this chiseling the reglet crack the plastic pipe?) What other techniques do you use to ensure water won't seep in the perimeter in between the pipe and the concrete around it?

Thank you.

 

[dik]

Is the roof depressed in the area of the drain, so that the flange doesn't protrude above the roofing? If it is depressed, a butyl 'gasket' to provide a seal and install the drain flange as per instructions.

Dik

 

[lunct]

what roof?

No. It's a bathroom in the 2nd floor of a residential house. Is it a requirement to use some type of membrane over the entire shower area.. or can you use waterproofing paint (including filling the perimeter between drain and concrete)?

The pipe is just cut at the end coinciding with the top of the concrete.. no flange or screws of whatever.

What do you guys use?

 

[hokie66]

Waterproofing of wet areas of houses is a specialist area, not really a structural engineering problem. But it is important, and it usually is controlled by local building practice standards.

 

[dik]

My error... but, the repair is the same... Judging from the condition... I'd tear it out and completely redo it... complete with waterproof membrane and tile...

Dik

 

[lunct]

dik.. if no membrane is used in the shower area floor but only waterproofing paint.. and water seep into the concrete below the tiles, what would happen to the concrete? Is the concern the bars inside can be damaged or water can seep from the concrete and condense on the ceiling below? But this takes a long time.. is it not?

Why do you need to put membrane if you can totally seal the perimeter between the cut pipe and concrete by some kind of sealant?

 

[hokie66]

Some membranes are applied in sheets, as the torch on ones you mentioned. But other membranes are liquid applied, and should probably not be referred to as "only waterproofing paint". If done correctly, they work.

 

[lunct]

ok.. i'll get the liquid applied membrane.. but my question is the perimeter between pipe and concrete.. is this liquid applied membrane enough to seal the space between the pipe and concrete.. what do you guys use here?

 

[hokie66]

The membrane goes right down into the pipe. So the path of water is continuosly sealed. The liquid applied membranes are usually used in conjunction with fibreglass reinforcement.

 

[lunct]

Ok. I'll use the Sikatop Seal 107. This is the only one available in my country. Has anyone tried using it in the shower area of the bathroom? Or the entire bathroom?

http://nga.sika.com/content/dam/dms/ng01/0/ng-np-sikatop-seal-107.pdf

 

[wannabeSE]

I would ask a plumber or a plumbing engineer.