Mortar Thickness

cdh · 18 Jan 2009

Hi All

Building an extension and just finished up to dpc, but now need to build another wall off one of the sides. Ideally I would like to keep all the dpc in line on all walls. To do this I would need to make the mortar bed 40mm thick betweeen the block work and the 1st row of engineering brick to be able to line bricks up. Would this be OK or is it to thick?

Thanks

noseall · 18 Jan 2009

it is possible to 'muck up' at the dpc detail and you could gain 40mm at a push. you will struggle though if the bricks are wet, if they are particularly hard/impervious or if it is poor weather.

do you have an old double slate bed dpc on the existing house?

noseall · 18 Jan 2009

i have just re-read and i think i may have misunderstood. a single leap of 40mm is going to be a right pain if it is not at the dpc detail.

structurally there is no reason why not but practically....

^woody^ · 18 Jan 2009

Why can't you just keep the top course of engineers level and then have a normal 20mm DPC?

Do the face bricks above need to line through with the existing walls?

I think that two 20mm joints in building sand either side of a DPC, may be prone to some cracking from contraction, which may stress the DPC felt. So may be best to avoid it if possible.

But it will look crapp with a massive joint on new work

Shytalkz · 19 Jan 2009

^woody^ said:
But it will look crapp with a massive joint on new work

Won't it just!

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Mortar Thickness

cdh

noseall

noseall

^woody^

Shytalkz

DIYnot Local

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