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_TEOTWAWKI_ t1_iulzhid wrote

Just taking a stab here, but I'm going to guess this is an older home with plaster walls and built on a grade level masonry foundation in a wet climate (UK?). My best guess would be that the garden doesn't grade away from the flat(s) and the foundation/slab aren't waterproofed. Masonry is essentially a sponge, and the only place for the water to go is up into the walls since you have impermeable flooring. Here in Seattle, a common retrofit for slab-on-grade homes is to trench a perimeter footing drain around the house to relieve hydraulic pressure under the slab since our water table comes right to the surface in areas during the winter. (Water wells will become artisan in winter)

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jvrcb17 t1_iun60ot wrote

Ah, a fellow rain city person.

This is solid advice

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Manage-It t1_iundy9e wrote

>_TEOTWAWKI_
>
>I'd like to second what _TEOTWAWKI_says. However, I would emphasize checking the crawl space to see if a moisture barrier is present. If the crawl space is just exposed soil, that's likely your main source. Moisture will evaporate into your home during warming periods and when the house is heated. As a minimal expense test, I would recommend buying a moisture barrier and stretching it over the exposed soil below the crawl space and making sure all gutter drains and surrounding foundation slopes exit away from the house and crawl space and cannot pool.

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