If so what i would do is incorporate another DPM sheet over the subfloor and install the insulation and plumbing over this...and then pour your screed. A second DPM layer is no harm to the construction.
Carpenters suggestion is ok but is very labour intensive, more expensive, awkward and may not guarantee the result you want.
The main issue you need to remember about the DPC at the external walls is to have an upstand on the inner leaf and slope down to the other leaf.
Syd/Carpenter...thanks again for the responses.
Syd...the UFH pipes are not laid yet, so I'll fit the secondary dpm over the insulation. Given that its very unlikely to be completely rain-free while laying this DPM, then laying the UFH and finally screeding, how much of an issue is it if rain-water gets underneath the secondary DPM? Thanks in advance, apple1
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