Damp - replace internal plaster?

[sarahdharrison]

On a bit of steep learning curve with our first house ~1890's victorian cottage.

In October we are having concrete render removed from a damp exterior wall and replaced with a lime plaster.

on the interior of the same wall, the damp is in certain places but not others. i think it could be where there is old lime plaster, on the basis the water will follow the path of least resistance? there are also what i think are salt deposits.

anyway my question is once we have external lime breathable render and have let the wall dry out a bit - what should we do about the salts & repairing the look of the interior plaster? would it be easier to replace the lot?

i'm keen to get it whatever needs doing done now - but would be re-doing it in 6 months?

Thanks

 

[paulbandler]

I have almost exactly the same problem and tried to ask this question at the end of http://periodpropertyshop.co.uk/phpBB2/viewtopic.php?t=6518&highlight=lime+plaster

However I think my question may have gotten lost a bit. I'll be watching for any replies to this question with interest.

 

[paulbandler]

oops - I put the wrong link in my previous reply... It should have been http://periodpropertyshop.co.uk/phpBB2/viewtopic.php?t=6490&highlight=

 

[NT]

anyway my question is once we have external lime breathable render and have let the wall dry out a bit - what should we do about the salts & repairing the look of the interior plaster?

patch fill, skim or replace it. Cant think of any other options.

would it be easier to replace the lot?

how can we know from here?


NT

 

[Gervase]

AS NT says, without seeing the wall, it's hard to know.
If you're hiring a plasterer, it is often easier and and cheaper for him/her to replace all the plaster on one wall rather than patching and filling it, for the simple reason that areas where you're going to patch need preparation - undercutting the edges, and taking them back to where the plaster is firmly attached, which takes time and therefore costs - and the plaster itself needs to go on in two or even three coats if your existing stuff is thick, which is what s/he'll be doing if you decide to replaster the whole wall.
That said, standard conservation practice is to retain as much original plaster as possible; repairing rather than replacing.