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Yes I was also thinking that, but because my trench is lower than all my rainwater drainage I’d have to extend the trench into my back garden to then direct the drained water there, and because everything is heavy clay the water still wouldn’t go anywhere, and I’ve read it pointless putting a...

I’ve recently had to dig out next to my house because there were holes within the mortar letting water into the sub floor of the house. I’ve now re-pointed all the brickwork but was wandering what to put back into the trench I’ve dug? Hopefully the picture I’ve attached shows what I’ve done. It...

Sorry yes that’s what I meant a vapour barrier on top of the clay, followed by some crushed rock or pea gravel to hold it on place. Currently between the joists under the floorboards is polystyrene insulation that is fixed from below, so half of the solid joists are only visible

Yes the ground level under the house is lower than outside. And the outside levels are well below any current air bricks. It’s comes when it rains, I think because the cavity is full of soil, that is higher than the dpc, that the dpc has been breached, possibly tracking on the outside brick of...

I live in a 1930’s detached house with a 2ft crawl space under timber joists, but the crawl space floor is mainly clay and is quite wet/damp. There are a couple of air bricks around the sides of the house, but I am going to install some more to increase air flow. The previous owners have had a...