French translation: couche hydrofuge (not membrane)
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couche hydrofuge ou membrane hydrofuge (selon le cas)
Explanation: D.P.C. is "damp proof course" and I would translate it as couche hydrofuge. Here is a quote from a website: "Plans should show a stepped, damp proof course (DPC) which is essential above and below
the Winblok panel for cavity, and bagged and tarred, inner skin walls." Hope it helps.