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I had thought of breaking the slate between the wall tell80. The advantages of the slate between the walls is that it blocks any mositure from the foundations, the disadvantages is a little sand and mortar and its bridged easily. I think breaking it would be a bit difficult and risk damage to...

Thanks tell80 Ive got four holes open now, about 1/3 of the job done. I'll close holes before I continue onto new holes. I'll never get it perfect, but I'll get most of the sand and mortar off the slate DPC which straddles the inner and outer leaf

3 holes and eight bags of sand and rubble now Should there be any concern about taking brick out under windows, about 6 to 8 course below the window and towards the edges

Thanks for your encouragement JohnD, I like the corner brick idea, I'll give that a try Don't know anything about drains, take it a step at a time Thanks

Thanks

Here one cavity

I have removed some bricks to clear the cavity. I have seen the slate DPC in the wall and I can feel the slate DPC in the cavity. I have taken 4 rubble bags of sand and loose mortar out of jsut two separate holes in the wall so far The inside is a solid concrete floor. I guess it replaced a...

Yes there must be a drain running along the side of the house as the kitchen sink drains into a gulley at the side wall. However the drain is below a disabled concrete ramp and would need to break up concrete to access drain

Thanks I'll take a wide photo. I think it could be the wide gap between the wall and the concrete pathway that is allowing rainwater into the foundations and wetting the wall and causing the algae to grow. Not seen the roof leaking. Not sure how to detect a leaking drain

Update It turns out the DPC was slate buried in the mortar. Also I think the slate DPC spans the cavity

I spoke too soon, copper lead connection was just above it. I think the tin dripped onto the lead when they made the connection.

Looks like copper underneath but looks like lead on top

Thanks Woody

Thanks Ken I have a snake camera and I can see that where I am going next. So far it seems all the wall.

Yes trying to keep the brick taken out to a minimum

Does anyone have any expericence of cavity wall clearing I have found the cavity walls have quite a bit of sand in them. The sand bridges the DPC and in some cases goes above 400mm above DPC. Aslo as you go down the wall it turns solid mortar. I was thinking of trying to get a rotary mutitool...

That is a cloth (felt I guess) underlay against the wall and under the lead

I looked at the roof more closely today I can confirm that there are no holes in the lead I don't think the roof is the source of the dampness. Althougth it does not have soakers it will probably stop water ingress. Any rainwater that strikes the wall or side of the roof in the corner will be...

tell80 thanks for your advice. I'll give it a go.

Thanks datarebal I did not see soakers, but also not totally sure what they woould look like when installed. I'll take a closer look to see if there is a hole in the lead. If no soakers will they need to be retro fitted. They have covered up, above the pitched roof, with render. Not sure if...