Extension ceiling fabric choice by builder - Is this a breather membrane?

[andeebee]

Hi all, Would just like some reassurance over a building fabric usd in my renovation / extension.

I had originally asked that I wanted to fit a breather membrane like Pro Clima Intello fabric into the extension ceiling space between the living area and the warm roof, the builder replied saying he had some material that was expensive, so I felt reassured that this would be suitable.

My extension has had a green poly looking material fitted for some weeks now, which doesnt look like the Intello fabric up close, it looks like poly.

Can anyone tell from this photo what has been fitted and whether it is suitable to be fitted in the ceiling?

I found a similar looking material listed on ebay as a 'vapour control barrier' in the same green colour, but was to be used under wooden flooring.

 

I have given up trying to get the place airtight now as there are so many holes, but I dont want any problems due to the wrong material being used.

[Nickfromwales]

Defo supposed to be a VCL. Breather would be on the external surfaces. With correct detailing, it could become the AVCL, but a lot of questions would need answering to assure you of this, plus a lot more attention to detailing.

 

Are you having MVHR? I can't recall.

[Russell griffiths]

That looks like the cheapest polythene you can get. 
if it’s a warm roof shouldn’t the vcl already have gone in under the insulation. 

is this the same builder that didn’t seal up all the roof area that you had to redo. 
and the same one that built the timberframe 

I questioned a section of your timberframe saying it was wrong but you didn’t reply to that bit. 
 

if it is then you need a new builder. 

Edited 1 hour ago by Russell griffiths

[Nestor]

On my warm flat roof I fitted the VCL after the Rockwool in between the joists, then OSB, Batten, Plasterboard.

I fitted 40mm Pavatherm above the joists.