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Hi

Having removed the boards and insulation under the dining room window and found, what looks like, the rear of the outer render I am curious as to how the house was damp proofed. I know how to look for a membrane or proof of an injectable one but how on earth were these houses done? The downstairs loo has damp up the outer wall now that we have removed a tiled panel so we also need to remedy this. We are having an extension built along the rear of the property and a porch on the front and want to ensure that the damp proof course isn’t bridged.

Thank you

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Hi, I have noticed on the outside of the house there is a slight mark from what appears to be a bitumen based waterproofing. It appears that some sort of bitumen was applied to the foundation slab before the walls were rendered, or possibly before the steel frame was even assembled.

The bitumen or similar has dripped from under the ‘lip’ formed by the bottom edge of the render, over the bare concrete foundation slab/platform.

Ed

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Here’s a closer look.

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Hi ibl2041
Thank you for your question.

First off, the outer toilet brick wall, is usually constructed from a single brick of block skin and although it does have a tar felt like damp proof course, being only a single skin, it is prone to damp, especially if there is cracking to the outer render, particularly where the wall ties in to the house.

As for the house itself, many of the original sectional construction diagrams in our archive do not show the damp proof course but I have managed to locate an original blueprint for you (hence the delay in replying), which does show the damp proof course as being a felt layer located underneath a 2 1/2″ screed layer.
The blueprint is not the easiest document to view but I hope this answers your question.

If you have taken any photographs along the way, it would be great to see them.

Marc

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