Waterproofing + drains

[memphis]

Hey guys,

I have just finished waterproofing my new shower using morgans 2pack waterproofing membrane.

I followed the manufacturers instructions on folding the membrane into the floor waste like this diagram



And all is good, now my issue is my drop in waste drain wont "drop in" as now the waterproofing has made for a tight fit, a very tight fit, tight enough that i dont think it will allow water to drain from the membrane if anything got through the tiles.

My question is how should I go about installing the drain?, should i just push it in and let it sit tight as and hope water will flow past, or should i cut some grooves into the drain so that water can channel down the sides and into the pipe?

Thanks!

[wonderplumb]

Usually you would waterproof the sub-floor and then lay a bed of sand and cement over it, and this is where the grate normally goes in when the tilings done.

[Tools]

Are you just trying to fit the grate in to the pipe, or have you used a puddle flange or a leak control flange?

Tools

[memphis]

Just trying to fit it into the pipe...

Laying a morter bed over the top of the waterproofing is an option if no other solutions will suffice.

[autogenous]

Just trying to fit it into the pipe...

Normally the detail is different to the one shown above. If you have already done it this way then you will need to remove the waterproofing from the internal of the pipe.
Then you can place the drain fitting in the pipe.
Place a good bead of appropriate silicon around the edge of the pipe to stop ingress between the pipe and the waterproofing.

[memphis]

Normally the detail is different to the one shown above. If you have already done it this way then you will need to remove the waterproofing from the internal of the pipe.
Then you can place the drain fitting in the pipe.
Place a good bead of appropriate silicon around the edge of the pipe to stop ingress between the pipe and the waterproofing.

Yes I could do that, but wouldnt that weaken the waterproofing around the drain?

would i remove the waterproofing going back a few mm from the pvc pipe as well?

[wonderplumb]

That would then defeat the whole waterproofing exercize......

[autogenous]

That would then defeat the whole waterproofing exercize.

If a decent silicon (Construction Sikaflex)is used between the pipe the fibreglass membrane will be fine. Maybe even better.

Personally I think the waterproofing agent should go off the floor up the outside of the pipe.

Explain to me how she will get the drain fitting in the pipe with it bogged up with waterproofing agent?

[memphis]

If a decent silicon (Construction Sikaflex)is used between the pipe the fibreglass membrane will be fine. Maybe even better.

Personally I think the waterproofing agent should go off the floor up the outside of the pipe.

Explain to me how she will get the drain fitting in the pipe with it bogged up with waterproofing agent?

*he

I am using a 2pack membrane (latex based i think) not fibreglass. It is a bit of a tricky one, its a very important part of the waterproofing so i am a bit hesitant to remove the membrane completely around the drain, I might remove it and have another shot at the drain, trying to keep the application thinner inside the pipe to allow the drain to drop in (this might mean i need to remove the reinforcement fabric from inside the drain itself). Then follow this with a layer of sikaflex pro to be sure. how does that sound?

Cheers

[wonderplumb]

If a decent silicon (Construction Sikaflex)is used between the pipe the fibreglass membrane will be fine. Maybe even better.

Personally I think the waterproofing agent should go off the floor up the outside of the pipe.

Explain to me how she will get the drain fitting in the pipe with it bogged up with waterproofing agent?

What I am getting at is when you water proof a bathroom, you need it to be able to drain, OK a bead of sikaflex is a good way to get around it but there will always be a niggling doubt that you have sealed the area completely, also you must make sure that the two products are compatible, check with the manufacturers.
Waterproofing should always be done down into the pipe to ensure that no water will have a chance of getting under the membrane, otherwise it may as well not be done at all.
Another point I was trying to make is that a bed of sand and cement usually goes on after the waterproofing before the tiles and the floor waste grate gets tiled in with the tiles.
If you waterproof up the sides of the pipe, where will the water go in the event of a major spillage?????
Also, you need to consider that if something fails, then your floor or wall studs etc. rot out, your insurance company is going to want to know who your water-proofer is and you will end up with a shyte fight on your hands.
BTW sikaflex is a polyurethane based product rather than silicone based.

[Tools]

The detail you have been given is terrible, and to rely on silicone is fraught with danger. You need to use a leak control or a puddle flange.

http://www.artplastics.com.au/leakControl.asp#Puddle

[memphis]

The detail you have been given is terrible, and to rely on silicone is fraught with danger. You need to use a leak control or a puddle flange.

http://www.artplastics.com.au/leakControl.asp#Puddle

Tools,

You truley are the man, just dropped into the local plumbing place, picked up a drop in flange system that will work perfect. Just needed the right lingo ("puddle flange")

Thanks.