Non-breathable membrane under suspended timber floor

[Pip89]

Hello

My wife and I currently have a builder insulating a suspended timber floor. The builder has put a membrane down called Protect A1, which I read online is non-breathable. Will this be a problem? There’s still ventilation on the side where the membrane hangs down.

Is there anything I can do to rectify this, e.g. by putting holes in the membrane so it can breathe?

Thank you

Pip89

 

[freddiemercurystwin]

Assuming the void beneath the floor is adequately vented then it's a non issue, hot air rises so any hot air will be looking to escape through the walls and ceiling not the floor.

 

[Pip89]

Thank you, appreciate the response and it puts our mind at rest