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[Greeny2009]

Hi doing up old sitting room in late 1970's house.

problem is cant get old layered wall paper off the wall which is dabbed on plasterboad. Looking for a clean wall when finshed to paint etc..

Questions are
1)can I just mushroom fix plasterboard straight onto existing wall.

2)can i mushroom fix thermal board(insulted plasterboard) direct onto external wall.

3)Would it be better to strip off back to block and
a) fix battons and apply thermal board direct (is it safe to leave that cavity air gap)
b) fix battons and use polly board insulation inbetween battons and then fix plasterboard

[kbrownie]

I don't understand the term mushroom?, but you can dot'n'dad.
KB

[rosebery]

Rip the old stuff down and either replaster properly (bonding then topcoat) or put up new PB with dot and dab and skim. If you use battens you won't get a flat surface for the plasterboard. Using PB adhesive allows you to get a perfectly vertical and flat surface.

Not sure why you would want thermal board or insulation. Does the house not have cavity wall insulation?

Cheers