Terraced home: I want vapour-open, neighbours using non-breathable methods
Information, help, tips and advice on cavity walls, ceilings and lofts etc....

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joenix
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Terraced home: I want vapour-open, neighbours using non-breathable methods

by joenix » Sun Nov 06, 2022 4:47 pm

Hello!
I live in a 1918 terraced building site. Everything needs to be done. But mould issues with various people on the street is pushing me to the breathable insulation route.
Tile on sand floor, no DPM, and double brick external walls with a gap that's too small for blown-in insulation.
But the neighbours have used cement renders (one half of our shared chimney is covered with the stuff), regular insulation, and have installed new cement floors (that's out of my budget, btw). I'm worried their methods will be pushing more moisture into my own place. I can use external insulation out the back but not the front. I was planning on using wood fibre boards on the inside of the front wall (and for acoustics on the internal shared walls as they haven't bothered (I'm quiet, they're not) in combination with a centralised heat recovery ventilation system. The floor is a problem. As I said, putting in a new floor, let alone a limecrete floor, is out of my budget). I was thinking of getting rid of the old, battered tiles, levelling the sand, and putting a new layer of unglazed tiles with lime mortar down. But the floor's not so damp, so also there's the possibility of a DPM on the floor and first couple of cm of the walls before insulation and laminate. But if the neighbours have concrete slabs and non-breathable wall insulation, would my choice be able to cope? Or am I worrying about nothing because moisture won't move to my place from the neighbour floor/walls?
Thanks!
Sarah.

stoneyboy
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Re: Terraced home: I want vapour-open, neighbours using non-breathable methods

by stoneyboy » Tue Nov 08, 2022 10:36 pm

Hi joenix,
I dont think you need to worry about damp coming through from next door, in view of the age of your property it is unlikely that the walls will have a effective DPC so this will always be an issue.
Suggest you remove the floor tiles level the floor, add a DPM and then rebed the tiles but turned over, this will be your cheapest option.
Regards S

joenix
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Re: Terraced home: I want vapour-open, neighbours using non-breathable methods

by joenix » Tue Nov 08, 2022 10:48 pm

Thanks. Definitely no DPM in the walls of floor. The underside of the tiles is very manky. But if a DPM won't cause too many issues with pushing too much water vapour into the walls, I can start with laminate and rethink in a few years time.

stoneyboy
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Re: Terraced home: I want vapour-open, neighbours using non-breathable methods

by stoneyboy » Wed Nov 09, 2022 10:26 pm

Hi joenix,
Presumably you have quarry tiles at the moment and they are pretty impervious so any damp will be sealed in. A DPM will have a similar effect so you should not find much difference in damp in the walls.
Regards S

stoneyboy
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Re: Terraced home: I want vapour-open, neighbours using non-breathable methods

by stoneyboy » Wed Nov 09, 2022 11:02 pm

Hi joenix,
Presumably you have quarry tiles at the moment and they are pretty impervious so any damp will be sealed in. A DPM will have a similar effect so you should not find much difference in damp in the walls.
Regards S

joenix
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Re: Terraced home: I want vapour-open, neighbours using non-breathable methods

by joenix » Thu Nov 10, 2022 8:08 am

That's right. Quarry tiles on lime mortar. I always understood moisture escaped through the lime more than the tiles. But even then, that's a very small area for water vapour to escape from so I think I will try the DPM route.

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