GrantMcscott Posted December 7, 2020 Share Posted December 7, 2020 Due to the way the person erected the timber frame the cavity below DPM will be a bit wider that the standard 50mm (may be up to 10 to 30mm in places) that will be above DPM Does it matter if the insulation below the bi-fold doors and standard doors does not fill the cavity or do I even need the insulation in the cavity below DPM if there is 20 mm of insulation below the door. Link to comment Share on other sites More sharing options...
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