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I just spoke with Polypipe and they said polyeurethane type foam is fine used with plastic water pipe, for future reference.

Thanks John, I was hoping this would be the case as I assume the expanding foam has similar properties to the pir. My only worry is that an odour or taint might be transfered from the foam into the water feed - what do you think? I assume the foam wouldn't react with and deteriorate the water...

Hi, I'm laying PIR insulation boards on my slab in preparation to clip underfloor heating pipes to it. The problem I have is that I have had to cut the boards around my water feed pipes running across the room, so I have channels which I need to fill to prevent the screed cracking when it's...

I need to lay a screed floor over Xtratherm PIR insulation and UFH and am wondering what perimeter upstand to use. Building control has requested 30mm PIR - will this deal with thermal expansion of the screed or do I need to use an additional expansion foam strip?

Thanks for your suggestion thereisaplan. I definitely need to make up 100mm to get to my adjacent floor levels though. Other suggestions or comments on my proposed solution gratefully received!

Hi, I'm installing wet under floor heating to a first floor bathroom but have a problem with floor levels. The top of the joists are 100mm below the adjacent floor levels - ie the bathroom floor joists are 100mm below the level of the hallway. My first thought is to screw ply (22mm?) onto the...

Bit of an update, I'm having trouble removing the black (bitumen?) glue from the concrete that was left by the old vinly tiles - I've read a few topics on the forum relating to this and they seem to say that this should be OK to tile onto with my powdered adhesive. The old vinyl glue is a very...

Thanks for the reply gcol :) Good steer on the Dunlop adhesive but by the time I've added VAT and delivery to the Trades Direct price for white it's practically at the price I'll be paying for Mapei Keraquick around the corner (£27.99/20kg) ;) I'm aware of the white grout grime issues but we...

Hi there, newbie here with a few questions about tiling a 15 sq metres of wall & floor surfaces with 300x300x10mm porcelain tiles - not being one to make life easy for myself :) The wall is plastered brick in good condition and painted with emulsion - will the paint need to be removed? I'm...