DIYbanter - View Single Post - Single skin brick wall

RJH[_2_]

On 18/12/2017 04:04, wrote:
On Sunday, 17 December 2017 15:17:58 UTC, Andrew wrote:
On 17/12/2017 14:29, tabbypurr wrote:
On Sunday, 17 December 2017 12:59:40 UTC, larkim wrote:

So we will be having the whole wall stripped back and re-covered reasonably quickly in the new year. Not DIY, but wondering what input I should / could have on the spec of what is put in place.

Assuming we dont really want to lose floor space (so Im ruling out creating an air-gap with a batten frame etc), and at the moment are constraining ourselves to thinking about only having that one wall re-done, what are the recommendations for materials assuming we get everything removed back to the brickwork? Are we likely to be creating ourselves some damp issues if we go for a top end insulating plasterboard etc?

Any pitfalls that Im wilfully or unwittingly ignoring?

Thanks in advance for any tips!

Matt

PIR is the answer. Celotex, Kingspan, etc. Insulating plaster is more money and less insulation - and IIRC may also be polystyrene foam, much more flammable than chipboard or anything on Grenfell.

Yes, I'd recommend celotex. 50mm has turned one of the coldest rooms in
the house to one of the warmest. 25mm - makes a difference, but on
hindsight I wish I'd gone 50mm.

Damp shouldn't be a problem if the insulation is on the interior and coated with ali foil on the warm interior side.

The science on this is - complicated. Plenty of info available online.
An anecdotal tip would be to take the board below the room's floor/ceiling.

NT

If the whole wall is covered with chipboard stuck on with bitumen then
I guess this was done to deal with a problem of penetrating moisture
through what is presumably a 9 inch solid wall. Leave it in place.

Removing all the decoration and overlaying with another layer of
'celotex'-type stuff works wonders.

That advice would leave an impermeable barrier on the cold side of the new insulation, a recipe for damp & mould. I would not do that.

Although it all looks a bit of a dog's breakfast, I don't see how adding
insulation to the inside creates a greater risk of mould - heat from the
inside is more likely to stay inside, reducing any bridging.

--
Cheers, Rob