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Whereabouts is the plaster on the inside blown (in relation to the outside)
How are they proposing to repoint - What have they done on the other houses?
£11k seems like a lot, even if they are going to rake out the pointing manually, and use lime mortar and replace the red rubbers (which you want them to be doing as a matter of course).
NotThamesWater-
The blown interior ground floor wall is directly behind the downpipe on the photo above.
It's been caused by poor guttering which has been mostly sorted.
They are going to dig out/remove the old pointing, repair/replace the rubbers and use lime mortar.
They've done something similar on two houses up the road and the owner of one seems broadly happy so far.
This pic is from the other side of the blown interior wall
nankatsu
Yeah - I need to get yet another quote
They'll just do the front for £5k ish and the side wall is big