Wrote in message:
On Monday, 18 December 2017 12:51:01 UTC, Andrew wrote:
On 18/12/2017 04:04, tabbypurr 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 don?t really want to lose floor space (so I?m 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 I?m 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.

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


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.


NT

Not if you tape all the joints of the celotex. This will be another
impermeable barrier on the warm side which is what you need. Also
needs to be hermiticaly sealed all round the edges too.

It would need to be sealed impermeably and stay so for life to work. Expecting that from tape with the usual house movement is more than optimistic.


Celotex is closed-cell anyway. It is impermeable.

far from. quote:

I just watched this video http://www.youtube.com/watch?v=2-kG5D-GSL0 which shows 4 material samples sat on boiling water jars for 30 mins, and three of them transmitting significant amounts of vapour.
The 4 materials were foamglass, PIR, perlite and rockwool. Only the foamglass didn't transmit significant vapour.


?Copied & pasted from


http://www.greenbuildingforum.co.uk/...ts.php?Discuss
ionID=6879

The rest of the "quote" is there too but the video is no longer
available....

How many houses have 100deg c steaming interiors?

Cue more bs?

--
Jim K


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