I am attempting to replaster a wall in a 350 year old house. The house
is not listed.
Some of the previous plaster bubbled up and has now been removed. I
have not removed any of the plaster that appears sound. It would
appear that some of the old bricks are disintegrating i.e. they are
dry and crumbly on the outer surface.
Is there any way to fix the bricks before plastering and do I need to
strip off the whole wall?
I have noted a suggestion as to how to fix the bricks e.g fiberglass
resin but wonder if a PVA product such as Unibond would also be
Thanks in advance for any suggestions.
Fibreglass resin would be OTT and expensive. Pva diluted 1:4 with water is a
well tried (by me) solution to most crumbly problems. Seal the bricks with
it, then use it to mix a general purpose mortar to render them before
If you have serious damp, I'd use SBR instead of pva. Expensive, but it goes
a long way.
Rake out any crumbling mortar first and repoint with a sand cement mix. Leave
the pointing a little under the surface of the bricks to give something for the
plaster to key onto. Wire brush the bricks to remove the worst of the flaky
surface and then paint the area with unibond, maybe a couple of coats, leave to
dry and then plaster over that. The plaster will key into the pointing even if
some of the bricks are crumbly.
Dave Baker - Puma Race Engines (www.pumaracing.co.uk)
I'm not at all sure why women like men. We're argumentative, childish,
unsociable and extremely unappealing naked. I'm quite grateful they do though.
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