DIY Doctor

Question About Insulating Roof of 1930's Property

Postby Noo-B » Sun Aug 04, 2019 10:18 am

Hi,

I have a pitched roof which forms part of the ceiling in the bedroom of a 1930's house. At the moment it consists of clay tiles on top, wooden rafters etc. and then plasterboard nailed to the underside of the rafters. No sarking board/felt or anything else.

I would like to add some insulation to this in above the part over the bedroom, but the rafters are only 100mm deep and I understand that a 50mm ventilation gap needs to be left between the insulation and the tiles. Therefore I can only add 50mm of insulation (kinspan/celotex/etc.) without losing headroom.

My plan is to add 50mm insulation board between the rafters and then replace the plasterboard underneath the rafters with the plasterboard with insulation laminated on the back that you can get in DIY stores (27mm together) to reduce thermal bridging (losing a few mm headroom).

My question is, this probably doesn't meet modern insultation standards required by building regs but, as it's an improvement over current state (no insulation at all) of an old house does this matter?

Thanks for any advice.
Noo-B
Rank: Labourer
Progress to next rank:
25%
Posts: 2
Joined: Sun Aug 04, 2019 10:02 am


Sponsor

DIY asbestos test kits



  • 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