Celotex on single skin(brick) walls

9 Feb 2007
Reaction score
West Glamorgan
United Kingdom
Just need to know the best way to insulate single skin brick walls.

The walls are 100mm single skin red brick walls and externally have recently been rendered. Now I need to insulate internally and finish.

I contacted Celotex and they suggested fitting foil backed boards directly to the walls with 2 x 1 battens mechanically across the face of them and then platerboard fitted to the battens.

I am wondering if this would be the ideal way?

I was originally thinking about a studwork wall with a small cavity between it and the brick, then cut the celotex to fit in the stud wall.

any suggestions?
Sponsored Links
Celotex's method is better as it forms a continuous layer of insulation
Thanks for the reply.

What would be the best fixings for the battens, I already have the Celotex sheets already (50mm thick).

What worries me fixing the boards this way is that they will be punctured by the fixings from the battens, would this be a problem.

Also the room is being converted into a kitchen so there will be wall cupboards mounted onto the battens so the fixings will have to be quite strong.
I'm not sure whether 50mm would satisfy reg's. Is this 'project' being run through building control?

Ideally you could do with a 100mm secondary stud frame build just inside the brickwork with 100mm celotex between studs. This wall could then be sheeted with 18mm ply allowing you to fix the kitchen units wherever you please.
Sponsored Links
...better still, foam fix 50mm celotex directly to the brickwork, seal all joints giving a continuous barrier (as per woody), then build the stud frame with 50mm betwixt studs.
I have had some further advice from Kingspan who suggest building a stud wall internally with the insulation between the studs and a small cavity between the brick wall.
Quinn Therm have also replied and they suggest theat I fix pre treated battens directly to the brick wall with the insulation fixed to them, then the plasterboard fixed directly to the insulation.

A few different options but which would be the most suitable?

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.

Are you a trade or supplier? You can create your listing free at DIYnot Local

Sponsored Links