As for lego, Ive been in the trade over 40yr, .
... Ive been in the trade over 40yr,
The NHBC in all their wisdom recommend a slight projection of the DPC on external walls, and flush with the cavity inside.
Not really my choice, but it's in their manual.
It's done in different ways, but the NHBC guidance is the same nationally.The NHBC in all their wisdom recommend a slight projection of the DPC on external walls, and flush with the cavity inside.
Not really my choice, but it's in their manual.
Its done in all manner of different ways. B&Q warehouse near me is done with DPC visible all the way round. I built my extension with it protruding all round and trimmed off with a sharp knife afterwards. But a few mm of mortar bridging it will not do any harm.
Old slate ones were usually pointed over (even on single skin walls).
Also, the DPM should be layed on an uneven bed of mortar, around 5mm, so above and below is "locked" and cannot slide. DPC should not be placed direct onto bricks with nothing bonding it, and where it could get pierced by a sharp edge (often sharp bits around the holes in perforated bricks)
If you think about it, it is engineering common sense.
Simon.
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