Expansion insulation and plastic

[Moggaman]

Hi.

I am getting ready to pour my upstairs floor. It will be a self levelling screed about 60mm think. I will be placing an 8mm expansion/insulation piece at every wall external and internal prior to pouring . The plumber asked that I run a sheet of plastic on the insulation and up the wall prior to him fitting his UFH pipes . What is the best way to do this…stick the insulation to wall first? and let the plastic run up outside that?

I have walls plastered already .

thanks

 

 

[Conor]

You need a light guage DPM right to the edges and taped down. No need to go up the walls. Then edge insualtion around the perimeter. We got the screed company to do this and the guy stapled the insulation to the walls.

 

[Jilly]

My builder stapled the thin sheet of plastic up the walls then trimmed it off neatly afterwards.

[Russell griffiths]

Spray adhesive in a can, spray wall, lay plastic, stick to wall, spray plastic stick on foam, lay screed, trim excess plastic and foam with a Stanley knife. 

[Brickie]

Does it need a membrane on the first floor?

[PeterW]

Plasterboard on the walls too..?? If so you need to get a good way up the wall otherwise those walls will be a soggy mess as the water from the screed is sucked into the plaster. 
 

Decent DPM down and then it’s tape and hope time. 

[JohnMo]

20 minutes ago, Brickie said:

Does it need a membrane on the first floor?

The membrane is to stop the chemical reaction between the cement within the screed and the aluminium covering the insulation.  The reaction produces hydrogen gas, which leads to bubbles in the finished floor.