DIY Doctor

Earthwool insulation as wall cavity

Postby JazzQ » Sat Jun 13, 2020 7:28 am

I am having a single storey extension built and the builder has used 100mm Knuaf Earthwool insulation in the cavity wall instead of 100mm Rockwool insulation as specified in the drawings. I am annoyed at this because I understand rockwool is a better product and has better R value, fire resistant, better sound insulation. Its too late to rectify as the wall has already been built. Approx 26 square meter has been used. How much should I be looking to deduct from the final account now that I have a deficient wall insulation that wont retain heat for longer.
JazzQ
Rank: Labourer
Progress to next rank:
0%
Posts: 1
Joined: Sat Jun 13, 2020 7:09 am


Sponsor

Simply Build It

Postby stoneyboy » Sat Jun 13, 2020 10:19 pm

Hi jazzq
Probably easiest to ask your builder to increase the thickness of the insulation behind the plasterboard on external walls to compensate.
Regards S
stoneyboy
Rank: Project Manager
Posts: 3703
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