Hi - I have a large roof area which is welsh slate straight to sarkin boards, which when slates go missing causes water penetration to my lounge area - received quotes to de-slate/fit membrane/re-slate which is ~£26,000. As a cheaper alternative I was thinking of doing following since I have easy access to internal roof space :- 1) Fit insulation blocks between rafters eg Reticel Eurothane GP insulation board 2) Seal area between rafters with a non breathable waterproof membrane 3) Fit additional fibre insulation 4) Fit plasterboard
Is this a workable solution ? What are potential issues ?
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