DIY Doctor

Guidance on insulating cellar ceiling

Postby s.w.webb1 » Tue Jan 05, 2021 10:55 am

We have a cellar (2.7m * 2.6m) below our kitchen, currently there is 40mm SuperQuilt stapled to underside of the floor joists between the cellar & kitchen (not installed particularly well by the looks of it - lots of air gaps, no tape on joints etc).

I'd like to be able to board out the ceiling in the cellar to give it a bit of a better finish, but ultimately it's only for a workshop, not for a livable room.

What approach would you recommend? I'm leaning towards replacing the SuperQuilt with insulation I can fit between joists (wool type or celotex/board type) & then fix the plasterboard straight to the joist. Joists are 160mm. What level of insulation would I need to provide & do I need it to be backed with a vapour barrier? Do I need an air gap above/below the insulation?
Rank: Labourer
Progress to next rank:
Posts: 1
Joined: Tue Jan 05, 2021 10:30 am


Simply Build It

Postby stoneyboy » Wed Jan 06, 2021 9:58 pm

Hi S.w.webb1
Probably easiest to fit expanded polystyrene between the joists. Hold it in place by fixing battens to the joists under the sheets. Leave a gap above the sheets for services.
Regards S
Rank: Project Manager
Posts: 4052
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