Page 87 - Glow Insulation Product Guide
P. 87
PIR (WALLS)
1 - Vapour open membrane*
2 - Timber sheathing
3 - Quinn Therm QW boards between studs
456
3 2
4 - Quinn Therm QW or QL-Kraft 1 boards over studs
5 - Polyethylene AVCL 6 - Internal finish
U-value results below based upon wall construction shown:
103mm brick outer leaf; 40 - 50mm cavity;
vapour open membrane*; 12mm plywood
sheathing; 89 or 140mm timber studs @ 600mm centres
(timber bridging fraction 15%); Quinn Therm QW between
studs; Quinn Therm QW or QL-Kraft over studs; polyethylene
AVCL; 12mm plasterboard. Calculations performed to BS EN ISO 6946, taking account of repeating thermal bridges.
* Note: improved U-values may be achieved using reflective vapour open membranes.
Required thickness of Quinn Therm QW & QL-Kraft
Quinn Therm QW between studs and Quinn Therm QW or QL-Kraft across studs.
Between + Across studs (mm)
89mm stud U-value (W/m 2K)
140mm stud Uvalue (W/m 2K)
50 + 25 60 + 25 75 + 25 90 + 25
100 + 25 110 + 25 110 + 40 110 + 50 110 + 65
0.26 0.24
- - - - - - -
0.25 0.24 0.22 0.20 0.19 0.18 0.16 0.15 0.13
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