On 06/11/2011 21:25, Dave Liquorice wrote:

I'm going to play with it and plasterboard with foam insulation
bonded to the back as a lot of walls here are like that now. The foam
seems fairly friable so I don't think it will be a problem but I'll
set one or two into an off cut then dig away the foam and see what
has happened.

BTDTWTTS, found them to expand and grip without problem.

--
Mike Clarke