Page 72 - Glow Insulation Product Guide
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Flat Roof: Timber Deck Insulated with Quinn Therm QRFR
Design and Installation
When installing Quinn Therm QRFR boards to a timber deck an AVCL should be laid over the deck with 150mm sealed laps, turned up at any vertical upstand. The AVCL should consist of minimum 1000 gauge (250μm) polyethylene sheet.
Quinn Therm QRFR boards should be laid with joints staggered between rows.
The number of fixings required to fix each board will vary with building location, geometry and topographical data and should be assessed in accordance with BS EN 1991-1–4.
As a general rule a minimum of 4 fixings should be used per 1200 x 600mm board. Fixings should be placed 50– 150mm from the edges of the board with an additional row of fixings along the middle of the board.
When calculating U–values to BS EN ISO 6946 the number and type of mechanical fixings can change the thickness of insulation required.
The tabulated U-values were calculated based on telescopic tube fasteners with a thermal conductivity of 1.00W/mK or less, the effect of which is insignificant.
• Suitable for new build and refurbishment projects.
• Quinn Therm QRFR is available in a range of facings, making it compatible with all commonly specified waterproof systems.
• With a choice of Quinn Therm flat roof boards suited for use in this application, a wide range of roof coverings can be considered.
• Most of the Quinn Therm QRFR boards are LPCB approved to LPS 1181: Part 1 for built up cladding systems for use as the external envelope of buildings. Contact the Quinn Therm technical department for further details.
• The low thermal conductivity of Quinn Therm QRFR boards minimises the thickness of insulation required to achieve the design thermal performance.

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