DIYbanter - View Single Post

wrote:
hi

With all this talk of insulation, is it workable to cavity insulate
stone walls with random cavity? I would have thought so, though expect
a lot of filing holes would be needed. But I know its advised not to
cavity insulate some wall types.

NT

definately not.

A housing estate was insulated in Scotland (new build) and was later found
to have undressed stone on the cavity side....after six months or so all the
houses got damp, and I mean seriously damp, fungus growing outof walls,
timbers rotting everywhere, the rsidents had to move out while the houses
were ripped apart and the insulation removed.

The *minimum* cavity size to be filled must be at least 50mm, with undressed
stone this is impossible to gauge, some places it might be 75mm and others
only 35mm...it just doesn't fill and water ingress is the result.