Timber joists below DPC

3 Mar 2008
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United Kingdom
I have a 1920s house with cavity walls and slate DPC. As part of my extension, I have had a suspended timber floor lowered so that I can use thick insulation board below electric UFH and thick tiles whilst maintaining the same, final floor level. One end of the new, treated joists are now mortared into the internal sleeper wall and the other ends are into galvanised shoes mortared into the inner leaf of the outer wall. All the joist ends are now below DPC level. Should I be worried about damp getting into the new joists?
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If there is a way for moisture to pass from the brickwork to the timber, then yes you should be worried

Why didn't you use a hanger with a bit of DPC felt against the wall instead of building the joists in?
Thanks Woody. I didn't do the building work, but it seemed odd to me that there is no protection from moisture, even though they are treated timbers. I will raise the issue with the builder.

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