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- 6 Jan 2021
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I'm in the process of insulating between and under the rafters in an Victorian attic bedroom - decided to go with PIR due to the lack of rafters depth, and have finished the between rafters layer, so too late to switch tactic now to a breathable system.
There is an exposed purlin, which supports the rafters at mid span and my question is how to I achieve a VCL around the purlin. I presumed the VCL should go behind the purlin however where the rafters touch the purlin this isn't possible so I would end up with holes at these points which could lead to damp timbers. I wasn't planning to add insulation around the whole purlin as this would be on the warm internal side of the insulation. Would Installing the VCL on the internal face of the purlin be a bad idea which could trap moisture in the purlin and stop it drying out?
There is an exposed purlin, which supports the rafters at mid span and my question is how to I achieve a VCL around the purlin. I presumed the VCL should go behind the purlin however where the rafters touch the purlin this isn't possible so I would end up with holes at these points which could lead to damp timbers. I wasn't planning to add insulation around the whole purlin as this would be on the warm internal side of the insulation. Would Installing the VCL on the internal face of the purlin be a bad idea which could trap moisture in the purlin and stop it drying out?
