Page 75 - Glow Insulation Product Guide
P. 75

PIR (FLAT ROOF)
1 - Timber deck
2 - Vapour resistant sealant strip
3 - Quinn Therm QRFR-PLY boards 4 - Waterproofing layer
5 - QRFR boards
6 - Capping
6
4
5
3 2
1
U-value results below based
upon flat roof construction shown:
Plasterboard; timber deck; Quinn Therm QRFR-PLY plywood laminate on vapour resistant sealant strips (over joists at 400mm centres); waterproofing layer. Calculations performed to BS EN ISO 6946, taking account of repeating thermal bridges.
Required thickness of Quinn Therm QRFR-PLY and QR
Quinn Therm QR between joists (mm)
Quinn Therm QRFR-PLY* above joists (mm)
U-value (W/m 2K)
0 0 0 0 0
25 30 50
76
96 106 116 131 131 131 131
0.25 0.21 0.19 0.17 0.15 0.14 0.13 0.12
* Thickness of Quinn Therm QRFR-PLY includes 6mm WPB plywood Joists at 400mm centres.
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