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I need some advice on this, struggling to straighten the issue out in my head!
1900 South Wales Terrace, main living area has no DPM under the floor, it's a concrete floor, not hugely thick (I don't think) with ash maybe underneath that.
The walls in this room are not especially damp. I have two areas where the old render has come away.
1. Interior wall between two rooms, this is old red brick set side by side, a lot of the old render was loose in this area, or had been 'fixed' over the years with newer sand and cement, I've stripped this back to around a meter high, the mortar was damp in this area and has been left to dry out.
2. Another area is a wall under the stairs which is brick around an adjacent door way but the rest of the wall is stone, all the old render was stripped back here as it was pretty much falling off, this had been 'fixed' with a few small areas of modern material over time.
The modern materials have not made the damp hugely bad, there is no mould or anything on any of the walls, although there are a few spots where you struggle to get paint to adhere but these are minimal and around a chimney breast.
Question is, how do I put right?
In my head I was just going to inject a damp course to stop water rising up from the no DPM ground, then sand, cement, gypsum plaster over the top, but I'm questioning weather to go the hole hog and use a lime based render, but the whole ground floor has been gypsum plastered anyway!
so stick with the new (inject dmc/sand&cement / gypsum plaster) or strip all the walls back to brick and start again!
With the damp issues minimal, and the exposed areas to brick not being huge I'm verging on going to modern even though it feels wrong.
Thanks, they do cover the issue a bit but neither wall is external on the otherside, it's just a no DPM layer.
Trying to do my homework - https://www.heritage-house.org/damp-and-condensation/types-of-damp-what-have-i-got/what-is-rising-damp.html
There's a chap who does lime rendering in the area, sledgehammer to crack a nut but I may give him a call tomorrow.
I lived in an old stone house which would get rising damp each winter to about 1 metre up the walls.
Had someone strip off the internal plaster then fix a waterproof sheet (plastic/polythene) to the wall and plaster over that.
Obv it doesn’t stop the damp, but creates a barrier so the room is then dry.
I'd insulate. I have a 30s house built with block lined with hollow brick. There was some rising damp which I cured by drilling out a layer of mortar and replacing with waterproof mortar. The main problem was condensation. I did most of the outer walls with 27 layer insulation held between battons to allow air circulation behind. I removed a section to see what was happening after a year or so. It was all dry in exactly the same state as when I put it up. The damp problem is solved and the heat loss through the wall divided by about six.
Do you dry clothes inside?
Have a kitchen extraction unit that vents outside?
Or a shower extraction fan?
Sounds like moisture from inside is condensing on the cool walls and wetting them over time.
Surprised you have a concrete slab on wooden struts over a void. I would have thought that it would crack.
Lime is the correct coating but really a membrane, plus cellotex plus taped joints is probably the expensive ball ache answer you don't want
Thanks all
Prob 1. Im Going to inject, sand and cement then plaster over, its only a small area so not a huge issue if it needs a different approach in the future
Prob 2. Im going to use PIR/battens,membrane over the top the pb
I had it on 2 internal walls in a 1800s terrace.
They were brick with no dpc.
I tanked them
If you had read that heritage site properly you wouldn’t be injecting anything or using sand and cement. It needs lime plaster and breathable paint then properly ventilated. Don’t put any plastic or foam any where near it.