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@mespilus
Whilst I am all in favour of keeping the old skills alive,
I've found that as most people are full of shit,
even when dried as per above,
modern shrunken heads form a cold bridge across the cavity
and lead to condensation in the cavity.
Have you got a piece of the original venting pipe that you can use to ensure you maintain a cavity,
say with bundles of tiny shrunken heads separated by off-cuts of modern slab insulation?