Andrew Gabriel wrote:
"Andy" writes:
galvanised wall tie system
The website says internal/external use. The piece of paper in the placcy bag
it came in says 'internal use'. Any ideas on which is right and why?

Also, for those brick pillars I am building I bought some Wickes SS
butterfly
wall ties, usually associated with cavity walls: are these OK for tying
blockwork to brickwork in the case of a wall to a pillar?

AFAIK, use of galvanised wall ties on external walls was
banned sometime last year, because the galvanising was too
often damaged on building sites or during installation.

Isn't it the case that ties made at some period were BZP'd, or
somesuch, and cause problems due to the very thin coating, but
the ones from the first period of cavity wall building (early
C. 20th.) were heavily coated by hot dipping, and rarely cause
problems?


Ties have to be stainless steel now.

Dunno whether that's right or not, but stainless are a much
better bet.