On Tue, 4 May 2021 21:58:05 +0100, John Rumm
wrote:

snip

Wouldnt the same amount of insulation be more effective if on the inside of the block wall ?

Or take the chance to do both - more overall, and less loss of internal
space.

A close neighbour and also EOT and similar age property had the
external insulation cladding (he is the South facing end of a 10 house
terrace).

The house was sold (to the brother of the guy who lives at the other
and of the terrace) and they noticed damp in the upper flank wall.

It turns out that the tiles didn't fully cover the end of the
insulation and water was running / being blown underneath the outer
roof tiles and behind the insulation and onto (the solid brick) wall.
;-(

Now it has nowhere else to go it ends up going though the wall and
into the building. ;-(

They had some scaffolding erected and the bro from the other end did
something (replaced the end tiles for wider ones to provide more
overhang) in the hope to cure the problem that should never existed.

The problem is even if it was guaranteed work (maybe only to the
initial owner?) many people wouldn't want such people back and so fund
/ provide the remedial work themselves. ;-(

Cheers, T i m