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How to patch spalling brickwork?
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Anna Kettle[_2_]
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How to patch spalling brickwork?
On Fri, 20 Jun 2008 04:30:16 GMT,
(Anna Kettle) wrote:
and really do wet the wall down well, several times. An exposed wall
in midsummer gets very dry. Protect the setting mortar from the sun.
You may need to spray it down once or twice as it sets
Anna
On Thu, 19 Jun 2008 19:12:58 GMT, "George"
wrote:
wrote in message
...
I've got a large North-facing house wall of soft Norfolk red bricks -
and a large number have spalled.
It's really an impractically large number to cut out and replace.
I've been trying to patch over them with lime mortar (lime putty,
sharp sand and red brick dust).
Mix is good consistency & sticky - but it still isn't bonding very
well to the bricks (which have been gone over roughly with a wire
brush, brushed down and then wetted).
So I'm thinking - maybe wet down with 10% pva solution?
Other suggestions?
Use this in the cement mix,as you have done wet the brick first.
http://tinyurl.com/6o3w92
You dont need to add plasticiser to lime putty, it _is_ a plasticiser
I suspect that your layer of mortar a bit thin. 6-10mm works best
Consolidate the mortar once it has picked up a bit (ie some of the
water has migrated into the brickwork leaving air voids)
Try painting the brick with limewash before plastering. It will soak
into the brick a bit so when the lime sets there will be a chemical
bond between the brick and the lime mortar
Try drilling a few holes in the brick to give added mechanical key.
Hoover out the holes, wet them, limewash them, then plaster
But whatever you do it is still patching and you will never get a good
colourmatch. Cutting out and replacing the bricks will look better :-)
I wouldnt add PVA, it impairs the breathability and so will tend to
make the spalling worse in the future
Anna
--
~ ~ Anna Kettle, Suffolk, England
|""""| ~ Lime plaster repair and conservation
/ ^^ \ // Freehand modelling in lime: overmantels, pargeting etc
|_____ /
www.kettlenet.co.uk
--
~ ~ Anna Kettle, Suffolk, England
|""""| ~ Lime plaster repair and conservation
/ ^^ \ // Freehand modelling in lime: overmantels, pargeting etc
|_____ /
www.kettlenet.co.uk
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