Page 77 - Glow Insulation Product Guide
P. 77

PIR (FLAT ROOF)
1 - Lightweight metal deck 2 - Polyethylene AVCL
3 - QRFR boards
4 - Waterproofing layer
5 - QRFR boards 6 - Capping
U-value results below based
upon flat roof construction shown:
4
3
6
5
2
1
Lightweight metal deck; polyethylene AVCL;
Quinn Therm QRFR insulation (QRFR-GFR shown
for illustration); waterproofing layer (single ply membrane with 5 fixings per m2 shown). Calculations performed to BS EN ISO 6946, taking account of repeating thermal bridges.
Required thickness of Quinn Therm* on a flat roof with a metal deck
Quinn Therm QRFR-FFR Quinn Therm QRFR-GFR Quinn Therm QRFR-BFR
Quinn Therm U-value thickness (mm) (W/m 2K)
90 100 110 120 125 130 140 150
0.24 0.21 0.19 0.18 0.17 0.16 0.15 0.14
80 + 80 0.13
Quinn Therm U-value thickness (mm) (W/m 2K)
100 110 120 125 130 140 150
0.24 0.22 0.19 0.19 0.18 0.17 0.16
80 + 80 0.15 80 + 90* 0.14
Quinn Therm U-value thickness (mm) (W/m 2K)
100 110 120 125 130 140 150
0.24 0.22 0.19 0.19 0.18 0.17 0.16
80 + 80 0.15 80 + 90* 0.14
*Where different thicknesses of insulation are used, the thicker Quinn Therm board should be placed outermost.
When calculating U-values to BS EN ISO 6946, the type of mechanical fixing used may change the thickness of insulation required. The U-values in these tables were calculated using telescopic tube fasteners with a thermal conductivity of 1.00W/m.K or less, the effect of which is insignificant.
Compatability
• Quinn Therm QRFR-FFR: suitable for mechanically fixed single ply membranes.
• Quinn Therm QRFR-GFR: suitable for fully adhered and mechanically fixed single ply membranes, partially bonded built up felt, mastic asphalt and cold liquid applied waterproofing systems.
• Quinn Therm QRFR-BFR: suitable for hot or cold bonded built-up bituminous waterproofing systems.
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