having had Chemical DPCs put in in the past, I'm always curious as to
the reason for the specification of render that the DPC company insist
on..Salt/Water retardent is fairly obvious, but why Sharp sand as
opposed to any other (washed) sand ? Is Sand generally unwashed when
you buy it from the likes of Jewsons...can you taste the salt if
you're so inclined ? Is Sharp sand recommended as it's more bulky and
therefore cheaper to render to the thickness spec'd (10mm + 10mm in my
It makes a stronger and more coherent render. However, externally,
render is best done with a sand composed of almost uniform particles
with no fines", like granulated sugar. I've always ordered this
as "rendering sand", I guess there's a special name (LB?).
Depends... "washed" or "washing".... Ordinary builders' sand is not
washed, you can tell as it stains....
Are you thinking of beach sand? Beach sand isn't used, at least not
that I know of, in mainstream construction.
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