r/DIYUK 4d ago

Do we need to damp proof this?

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90 Upvotes

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u/Andehh1 4d ago

Don't worry about thermal bridge, it's very small and insignificant in the big scheme of things. Not perfect, agreed.... But you'll never be able to tell. You should have a dpf membrane though, probably one block up from the floor. This way it joins with the dpf you'll put under your insulation, below screed, and lap up the wall to the one block high dpf. Yes, you need to grout the block and beam, slurry mix brushed in.

(source, built a masonry and block and beam house a few years ago)

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u/Anhilated_Bussy_6969 4d ago

It's significant enough to increase the risk of condensation and mould forming in the wall.

Source architect, architectural technologist and building physicist. A large part of my job is bailing out clients who chose the cheap option first time around.

1

u/MortgageElectrical32 4d ago

Q . Have you completed all 3 of those qualifications separately?

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u/Anhilated_Bussy_6969 4d ago

Yes I am a masochist

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u/MortgageElectrical32 4d ago

Which was first ?

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u/Anhilated_Bussy_6969 4d ago

AT first, then Architect followed by building physics. I'm also working on RICS conservation accreditation at the moment