Page 82 - Glow Insulation Product Guide
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Solid Walls: Internal dty lining
insulated with Quinn Therm QW or QL-Foil fixed to battens
Design and Installation
Insulating an existing wall changes the heat and moisture patterns in the wall, so it is vital to carry out condensation risk analysis before undertaking any work on site. To minimise the risk of condensation the joints between Quinn Therm QW boards should be taped with metalised tape to form an AVCL which will prevent moisture from the building interior condensing on the cold side of the insulation.
Existing wall surfaces should be prepared by removing existing skirting, picture rails and window boards, as well as any wall coverings with high vapour resistance, such as vinyl wallpaper or gloss paint.
Battens should be isolated from the wall surface by a strip of DPC material and on uneven walls should be packed out to give a true surface for installing Quinn Therm QW.
Additional battens should be fixed to support cupboards, shelves and other fittings.
The screws which fix Quinn Therm QW to the battens should be selected to minimise heat loss: U-value calculations for the wall should account for the additional heat loss resulting from mechanical fasteners. The plasterboard lining should also be fixed back to the battens.
Using Quinn Therm QL-Foil insulated plasterboard enables the insulation and internal lining to be applied in one process.
• Suitable for new build and refurbishment projects.
• Applying Quinn Therm QW insulation or Quinn Therm QL-Foil insulated plasterboard to the internal face of masonry walls is an ideal method for improving the thermal performance of solid walls.
• Fixing to battens allows uneven wall surfaces to be treated, while the reflective foil facing forms a low emissivity cavity which further improves the thermal performance of the wall.
• Quinn Therm QW and QL-Foil boards are 2.4m long in order to match typical storey heights and minimise cutting.
• Insulating existing buildings internally always reduces the useful building volume. Quinn Therm insulation has a very low thermal conductivity, allowing design U-values to be achieved with minimum loss of volume.

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