DIY Doctor

Main navigation

Insulation board without membrane

Postby JasonClint » Thu Jan 19, 2023 5:52 pm

I have a 1930s semi with original roof. The roof is dry, but it's just tiles - no membrane.

Is it ok to install 50mm insulation board between the rafters (leaving a 50mm gap between board and tiles) without a membrane?
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Thu Jan 19, 2023 5:47 pm


Simply Build It

Postby stoneyboy » Sat Jan 21, 2023 12:30 am

Hi jasonclint,
Yes that will be ok provided you leave a ventilated air gap under the tiles.
Regards S
Rank: Project Manager
Posts: 6321
Joined: Wed Dec 10, 2008 6:44 pm

Display posts from previous
Sort by
Order by

  • DIY How to Project Guides
  • DIY how to tutorial projects and guides - Did you know we have a DIY Projects section? Well, if no, then we certainly do! Within this area of our site have literally hundreds of how-to guides and tutorials that cover a huge range of home improvement tasks. Each page also comes with pictures and a video to make completing those jobs even easier!

  • Related Topics