DPM for first floor UFH

[vala]

Is this needed before laying pipes and putting the pug screed on?

Wunda instructions say yes, however lots of images/threads etc I've read on pug screed installs doesn't show it.

[Nickfromwales]

Most recommend a slip membrane, assuming foil faced PIR or aluminium components which have a reaction with the cementitious screeds, but ultimately it’s not required on a 1st floor installation.  

What material will the pug mix be sitting on?

[vala]

Hi @Nickfromwales

the pug mix will be sat on PIR boards that are 100mm thick.

[Nickfromwales]

1 minute ago, vala said:

Hi @Nickfromwales

the pug mix will be sat on PIR boards that are 100mm thick.

The foil will react with the dry pug mix, but not to the point you will ever suffer any detriment. A 1200g membrane is pennies though, so if your'e bothered by this then fitting one is not even going to cost you a round of drinks  

[vala]

3 minutes ago, Nickfromwales said:

The foil will react with the dry pug mix, but not to the point you will ever suffer any detriment. A 1200g membrane is pennies though, so if your'e bothered by this then fitting one is not even going to cost you a round of drinks  

@Nickfromwales

thanks for the reply.

I'll get one fitted.