Insulating behind hung tiles.

[chris765]

Good morning all,

Our house upstairs is at parts, of a timber frame construction. On the front we have hung tiles and at the rear bricks, I imagine single skin.

I started to cut the plasterboard out to stick some sockets in (behind the hung tiles) and have realised the lack of insulation on the exterior walls, below the windows. As the radiators are on these exterior walls, global warning (for the uncynical amongst us) is probably down to me.

So in a start a job, find another 2 jobs along the way style, I now feel the need to insulate this area.
I will have to remove rads, remove plasterboard, and insulate behind.

The depth of the void is approx 100mm.

My first thought was to install 100mm Celotex, and where my drylining boxes are going, making a jigsaw puzzle slotting some 50mm celotex in.
I've read a lot about ventilation, and damp etc and was fearful that by putting 100mm in, there would be no air gap.

Can anyone advise please?
Thanks kindly,
Chris


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[catlad]

You could put 50mm celotex/kingspan between the studwork and then a vapour barrier stapled over studwork then insulated plaster board.

 

[chris765]

Catlad, thanks for your reply.

This sounds good. I've been researching into the insulated plasterboard but its really thick isnt it?
If so this would lift off the wall, and cutting in the dryliner boxes would be a bit tricky?

 

[seasickstevie]

. . . cutting in the dryliner boxes would be a bit tricky?

Why?

Just cut your rectangle with a padsaw, and clear a small section of insulation away each side to clear space for the lug slidy-out things.

 

[chris765]

Yup true.

As the radiator is on that wall, raising it off isn't really an option?

 

[catlad]

35mm is the thinnest insulated plaster board I have seen, if you locate your radiator brackets to the studwork or put an extra stud in when you have everything stripped back to fix the radiator to you will not have any problems hanging it.

 

[chris765]

No that should work.

I'll use 60mm GA4000 between studwork then 24.5mm pl4000. There's some play on the radiator pipework so shouldn't be any trouble.

Thanks all for your help!

Chris.