Greengates Builders Merchants

Quinn Therm For Cavity Insulation


  • Suitable for new build projects
  • The low thermal conductivity of Quinn Therm QW maximises the performance of the insulation and enables low U-values to be achieved while maintaining a clear cavity
  • The low emissivity facings of Quinn Therm QW improve the thermal performance of the cavity and reduce the U-value of the wall
  • Quinn Therm QW has good dimensional tolerances, enabling boards to be tightly butted to form a continuous layer of insulation
  • Quinn Therm QW board sizes are co-ordinated with standard wall tie spacings

Design and Installation

Cavities up to 100mm wide require wall ties at maximum 900mm horizontal centres and 450mm vertical centres, with additional ties around openings and at corners. Cavities wider than 100mm may require ties at reduced centres. Wall ties must slope down from the inner leaf in order to shed water into the cavity.

Wall ties can have a significant impact on the overall U-value of the wall. It is therefore important to select ties which will minimise heat loss, such as stainless steel double triangle ties. Ties should comply with EN 845–1 and PD 6697.

Wall insulation must extend 150mm below the upper edge of floor insulation to prevent thermal bridging at the floor perimeter. If the cavity includes a radon barrier the first run of boards should be supported on the cavity tray.

Quinn Therm QW boards should be fitted against the inner leaf of masonry and held in place by wall-tie clips or collars. Boards must be butted tightly together at corners to give a continuous layer of insulation, and cut neatly to fit tight to the backs of frames, sills, cavity closers and lintels.

The faces of masonry must be kept clean and clear of mortar snots and droppings to enable the Quinn Therm QW boards to be installed properly. When raising the outer leaf use a cavity board to protect the cavity from droppings.

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Greengates Builders Merchants delivering to the whole of Lancashire including: Accrington, Blackburn, Burnley, Clitheroe, Darwen, Great Harwood, Haslingden, Padiham and Pendle.

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