PITCHED ROOF
Thermal conductivity and thermal resistance are BS EN 12664, BS EN 12667 & BS EN 12939
ROOF CASSETTE: 315.5mm (U-value 0.15 W/m²k)
12.5mm Wall board & 3mm skim (0.19 W/mk)
C24 195x45mm Timber rafters, rafters @ 400mm centres
140mm Rigid insulation to cavity (0.022 W/mk)
40mm Rigid insulation to top (0.022 W/mk)
50x25mm Timber batten
Breather membrane
50x25mm Timber counter batten
Roof tiles (TBC by client)
Information:
Condensation Risk Analysis – Pitched Roof 140mm PIR + 40mm PIR – 17Sep2020
FLAT ROOF
Thermal conductivity and thermal resistance are BS EN 12664, BS EN 12667 & BS EN 12939
ROOF CASSETTE: 448.5mm (U-value 0.13 W/m²k)
12.5mm Wall board & 3mm skim (0.19 W/mk)
C24 245x45mm Timber rafters, rafters @ 400mm centres
100mm Mineral wool insulation to cavity (0.044 W/mk)
50mm to 5mm Timber firring to create fall min 1:80 (firring size dependant on length of cassette)
18mm OSB/3 structural board (0.13 W/mk)
Alutrix 600 adhesive vapour control layer
120mm Rigid fleece backed insulation (0.024 W/mk)
Aroumourplan SG single ply membrane
Information:
Condensation Risk Analysis – Flat Roof 120mm PIR + 100mm Wool – 17Sep2020