When it rains water saturates the soil and begins pressing against the basement walls and the underside of the floor water can begin to flow into the basement through cracks and joints and even penetrate the concrete itself.

we call it hydrostatic pressure and that water pressure pushes the water in, at the weakest point which is that floor wall joint.

so how much pressure is there out here

it’ll vary certainly on how hard it rains and from house to house but certainly enough to push water in water is a pretty small thing and concrete is porous so we don’t stand a chance of trying to seal it out.

What we want to do is drain it away and relieve the pressure. if the waterproofing expert also points out ample evidence that water has been migrating right through the basement walls

you know you see all this white chalky powder stuff on here it’s called efflorescence and it’s minerals from the soil and the concrete that dissolve in the water

the water comes through the wall very slowly and when the water evaporates it leaves the minerals behind so if you see this kind of chalk on your wall you know that you’ve got water that’s been moving through that concrete

yeah now this is another problem I’ve got right here.

if I get rain I’m get water that’s coming in from the sides at the bottom of the step.

Find out more. Check how fixing a Leaking Basement Wall Crack.