DIYmadDAD

Thanks guys. It seems that the consensus here and elsewhere that it's a very expensive 'nice to have'. The real question is if anyone has had experience of building control insisting on the replacement of standard felt with a breathable type?

I'm planning a loft conversion and a builder has advised me to replace the existing roofing felt with a breathable type to comply with building regs. My original intention was to insulate the roof between & over rafters with a 50mm ventilated cavity under the existing felt. I know a breathable felt is required for new-builds but I've not heard of a need to replace the felt during renovation before. The loft is ventilated and house built 2006. I'd welcome some other opinions. TIA

Hi all, I'm planning a loft conversion, currently at the design phase. Would welcome any advice, especially from those who have used the Telebeam system. Thanks in advance.