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we will likely be doing this (once the purchase goes through) flat has cavity walls but you would have to do the whole block as cavity goes all the way to the bottom. will only do 35-40mm (inc the plasterboard) over the top of existing plaster, was not going to bother but the recent fuel prices have caused us to rethink.
the windows and the sills/reveals mean we can’t do thicker but maybe the walls without windows will get 50mm. this will be dot n dab but with proper attention to sealing the board edges and fixings etc so it’s air tight to avoid condensation and cold bridging.
there is plenty of info out there from the manufacturers. i was looking at Kingspan K18 but not spoken to a dry lining person yet but my bathroom chap has someone in mind.
Mr_Smyth-
[…] looking at Kingspan K18 […]
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Members of Kingspan’s technical team joked that they lied about the fire safety properties of their insulation, the Grenfell Tower Inquiry has heard.
aglet
Preparing to re-plaster (insides of) external walls, incl. kitchen, bathroom, bedroom.
Walls are have been taken back to the plain old bricks, no cavity insulation.
Not sure what to use in which room - batten and PIR first then board on top?
Double up moisture resistant stuff for the bathroom?
Thermal plasterboard (though not sure 25mm of insulation is enough)?
Combination/differemt based on room type/use?
Full disclosure, will be getting someone in to do the work - but hoping to get material and know what I’m asking for in adavance.