Go to Forum Home Building Design Vapour-closed roof refurbishment on solid masonry wall

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      James Mullen
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      Hi all,

      Does anyone have a recommendation for creating a vapour barrier between a solid masonry wall and the existing roof (rafters) which is being thermally upgraded with PIR? There is the concern that moisture could pass from the wall into the roof build up (60mm PIR in 100mm rafters, with 57.5mm insulated PB underneath). I have imagined a DPC along the length of the wall but this may depend on how the rafters are sited/fixed

      Thanks

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