I wonder if anyone can give me any tips about exposing internal stone walls?
I've just acquired an old stone-built house with some very crumbly plaster.
Having hacked some of it away I've exposed some reasonable stonework - how do
I go about repointing it sympathetically and sealing it to eliminate dust but
without trapping any moisture within the wall?
Many thanks in advance
Don't know about repointing but I tried B&Q Exterior Stabilising Primer on a
dusty interior brick wall with very good results - it left an attractive
clean satin surface.
NB don't do this outside: without a topcoat, the surface will become milky
and messy-looking every time it rains.
Hack it off with a pin hammer or whatever and wire brush and clean with
brick acid if needed. Seal with a waterproof coat of anything you like
and then hack or wire brush a little more pointing out (to remove the
layer of waterproofing on it) and point with a lime sand mix.
The colour of the sand will dictate the final effect. Try a variety of
mixes before the final step. You can use as much lime as you like even
use it neat for a white pointing. About 6 parts sand to 1 of lime is
usual. You can even use less as it is not a weatherproof.
You can also use cement pointing of course. Working with lime compo is
easier and in my opinion looks better. After pointing, the stone will
easily clean up because of the sealant. You might want to reseal the
whole wall(s) again. There shouldn't be a damp problem.
Brick acid is one of the strongest acids, hydrochloric acid -worse than
bleach. If you choose to use it you do so at the risk of damage to pipes
and wires as well as to furnishings.
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replying to Michael McNeil, Looking160 wrote:
I dont think sealing a wall is appropriate Michael. Walls need to breath, they
take moisture in & let it out. Sealing will leave wall damp as no escape,
crumble & then structural damage caused. I think rub on some kind of oil on the
stone, it brings it out & stays looking darker for some time
Re-point with a mixture of 1 part lime putty (use google to find your
nearest supplier) to about 4 or 5 parts of a sharp sand chosen to give the
colour you like. I use Wickes sharp sand which has a nice pinkish white
Do not attempt to seal the wall - it will trap moisture and lead to damp
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