Lime mortar, repopinting and plastering

5 Jun 2012
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United Kingdom
I have a wall with some brickwork where the lime mortar has failed near to ceiling joists and also some damp has meant that a portion of the wall needed taking back to brick removing the lime mortar.

I am considering the options for the re-mortarting the bricks and plastering the wall, and would be keen to know what the experts would say.

- should the bricks be re-mortared with a hydrated lime mortar (5,1,1) or a cement mortar (5,1)?

- i'm also really confused about the best way to get the walls repaired. Should the wall be

(a) plastered with a lime mortar only (5,1,1)
(b) plastered with lime mortar (5,1,1 then skim plastered?
(b) rendered with cement/sand (5,1) then skim plastered?
(c) rendered with bonding then skim plastered?
(d) rendered with something else (?) then skim plastered?

It's just that, having chopped away at the lovely lime mortar (which is easy to remove) and come across a piece of sand/cement render (what's it's name in the trade ???) which was really a problem to chop away, I was wondering what would be best practice nowdays???
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Boarding then skim is common practice these days, which could benefit you insulation wise.
It's built with lime mortar to allow it to both to breath and so that the bond is softer than the brick.
If the wall is solid build, no question lime mortar, if cavity the choice can be either bearing in mind how it was built in the first place.
lime mortar is used not just to build the brick wall, but to facilitate movement and allow free movement of moisture. The last point is critical as the moisture weeps from the mortar not the brick, so cement mortar will seal it in, perhaps not a good move...pinenot :unsure:
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