During a course I attended in magnesium limestone building restoration at
the Institute for Advanced Studies in York, UK, an leathery old
timer European gothic cathedral restoration mason gave examples of
situations were the greenery, moss, brown gunk, etc, resting in crevasses and
little hollows had become the most suitable protection for the
preservation of the building by keeping water out better than the original
design. He spoke of having become very cautious before removing the
stuff. Didn't mention Ivy.
cp in bc
(just a wood guy)
----- Original Message -----
Sent: Monday, June 22, 2009 11:24
AM
Subject: Re: [BP] Ivy vines on
brick
Patrick,
I am guessing you mean those nasty Pethenocissus Quinquefolia
discs. We've only had any luck using waterwash and non-metallic fiber brushes,
and it's still a pain.
Twybil
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