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Hi - in our utility room there has been a strange patch on the wall since we moved in. It hasn't really changed over time and I showed it a builder and he wasn't too concerned about it. Some of the plaster is missing and the wall, especially on the corner where the door to the kitchen is feels...

Here is an image that shows the blue layer and the black membrane: And here you can see the black sticky layer that's under the central heating pipes:

blue layer, DPC, and pipe protection

blue layer and DPC

Hi - I've doing some cabling and pipe work in the living room and have dug a channel where the concrete floor meets the wall. I noticed that the concrete sits on a a thin blue layer of light blue paint, a bit like the colour of the walls in swimming pools. The bricks of the wall sits on top a...