Gwynne Anthony 2020

ART506 Dissertation 2019. Anthony Gwynne . 50 Figure 21: Section detail of dovecot to be converted into holiday let indicating problems of trapped water associated with modern forms of upgrading works (Source: Gwynne, 2017). Summary Although building control have enforcement powers to require the use of non-vapour permeable insulation and replace it with vapour permeable materials it is very difficult to enforce. PENATRATING RAIN WATER PENATRATING RAIN WATER NEW GROUND FLOOR- (U-value 0.22) Take up stone flags laid in lime mortar, Reuse original stone flagstones bedded on 75mm screed with under floor heating (by specialist) on 100mm conc slab 1000g separating layer, on 100mm Kingspan floor grade non- vapour permeable insulation on 1200g DPM/Radon barrier, on 150mm thick sand blinded hardcore UPGRADE EXTERNAL WALL- (U-value 0.3) Plastic tanking system fixed 1.2m up wall 100 x 50 timber studs at 400mm ctrs 100mm Kingspan non-vapour permeable thermal insulation 12.5mm vapour checked plasterboard & plaster skim UPGRADE ROOF- (U-value 0.16) Stone tiles Tyvek vapour permeable roof membrane Existing roof structure 100mm thick Kingspan non-vapour permeable insulation fixed between rafters & 50mm fixed under 12.5mm vapour checked plasterboard & plaster skim PROBLEMS Water gets trapped behind tanking & insulation & cannot evaporate, causing damp, rots timber & mould growth PROBLEMS Water gets trapped under polythene membrane and insulation and pushed into walls PROBLEMS Water cannot evaporate through roof and increases moisture in the building causing condensation & mould growth FIRST FLOOR WATER WATER WATER VAPOUR SECTION DETAIL RISING DAMP EXISTING SOLID STONE WALL EXISTING SOLID BRICK WALL