WWilts Posted January 17, 2022 Share Posted January 17, 2022 Cold roof, insulation in first floor ceiling/attic floor For airtightness, want to minimise penetrating the ceiling How to make pendant light fittings airtight, or how to substitute pendants with something more airtight? Link to comment Share on other sites More sharing options...
saveasteading Posted January 17, 2022 Share Posted January 17, 2022 Drill the holes for the screws, pump in some silicon, screw fit as normal. At the cable entry pump in silicon around the cable. You could do ore from above if it is accessible. 1 Link to comment Share on other sites More sharing options...
dpmiller Posted January 18, 2022 Share Posted January 18, 2022 where is the VCL? Link to comment Share on other sites More sharing options...
James94 Posted January 18, 2022 Share Posted January 18, 2022 Cold roof insulation vcl and 50mm service cavity is the way we went for air tightness. No need for anything to penetrate vcl. Regards James Link to comment Share on other sites More sharing options...
PeterW Posted January 18, 2022 Share Posted January 18, 2022 Use offcuts of airtightness tape around the cables and behind the rose but the better option is just use service voids below the VCL/ACL where possible. Link to comment Share on other sites More sharing options...
JohnMo Posted January 18, 2022 Share Posted January 18, 2022 30 minutes ago, James94 said: Cold roof insulation vcl and 50mm service cavity is the way we went for air tightness. No need for anything to penetrate vcl. Regards James +1 Link to comment Share on other sites More sharing options...
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