Page 86 - Glow Insulation Product Guide

PIR (WALLS)
Cavity Walls: Timber frame
insulated with Quinn Therm QW and QL-Kraft
Design and Installation
Quinn Therm QW boards should be cut to fit snugly between studs and to door and window framing. Any gaps between the insulation and studs should be filled with expanding polyurethane foam.
Depending on the depth and spacing of the studs and the U-value required of the wall, an additional layer of Quinn Therm QW or Quinn Therm QL-Kraft boards may be required, fixed across the inner face of the studs.
Timber framed walls require an AVCL to prevent damaging interstitial condensation forming on the back of the sheathing. Where Quinn Therm QW is fitted only between the studs a vapour resistant membrane, such as 500 gauge polyethylene, should be installed across the face of the studs.
Where a continuous layer of Quinn Therm QW is fitted across the inner face of the studs an AVCL may be formed by taping the joints between boards with metalised tape.
Condensation risk analysis should be carried out to ensure the specified AVCL has a sufficiently high vapour resistance for the project.
A service cavity can be formed by fitting plasterboard on battens, rather than nailing directly to the studs. Electrical and other services can then be run in the cavity without compromising the AVCL
Benefits
• Suitable for new build projects.
• Insulating timber framed construction with Quinn Therm enables designers to achieve low U-values without substantial increases in overall wall thickness.
• The low thermal conductivity of Quinn Therm QW minimises the thickness of insulation required.
• Quinn Therm QW is robust and easy to handle; it can be worked using a saw or sharp knife.
•Quinn Therm QL-Kraft thermal laminate offers a rapid solution for enhancing the thermal performance of timber framed walls to achieve the stringent standards required by some projects.
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