Float and set or dot and dab?

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17 Dec 2008
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Nottingham
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Hi all,
So I”m renovating my brothers house, built in 1901. It has double skin brick wall, no cavity.
I’ve been told NOT to dot’n’dab plasterboard as the moisture could travel through the bricks, through the board adhesive and into the plastered walls(?).
However, about 12 yeas ago he had the exterior of the house coated in some stuff from protectacoat. Having done a search in these forums and google it seems the company were less than well received by many.
That said, the product still seems in good condition. If so could dot’n’dab now be feasible as the outside is protected?
One wall that I have to do has been stripped back to the bricks, but it’s 2” out of plumb at the bottom. Filling 2” with hardwall could take a while.
Sadly most of the walls need stripping back to brick as the plaster is turning to sand. Plus they’ve been wallpapered so taking that off will half destroy the wall anyway.
There are 2 internal lathe and plaster walls where I’ve managed to board over 9.5mm using screws and foam adhesive.
But the internal sides of the exterior walls I need advice on.
So, please.....advise me.
 
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Wouldn't you fix battens to the wall, packed as required, with polythene behind packers, and screw your plasterboard to the battens? You would probably need a polythene membrane behind the plasterboard too.
 

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