Choosing the right glazing solution

The project began when the main contractor, Coulson Building Group, approached Selectaglaze to discuss secondary glazing options that could boost thermal retention, which was a priority for the church on both environmental and budgetary grounds. After reviewing the various options, side-hung casements were chosen. They offered the best fit for the chapel, where the primary windows are rectangular with a gentle curve at the top. Fixed-light secondary glazing, with slim framing sections and interlocks, was specified for the larger windows in the nave. There was no need for these to open, since ventilation was already being handled by the newly installed roof lights. In total, 56 units were installed: four Series 45 side-hung casements in the chapel and 52 Series 46 slimline fixed lights in the nave, all designed to sit quietly within the existing window surrounds. The Series 45 hinged casement system suits many types of windows and standard-sized doors, with neat flush hinges and slim handles or flush locks for clean internal lines. The Series 46 slimline fixed light can be shaped or curved — even to a full circle — making it ideal for church windows that don't need regular opening. Installing the high-level units required full scaffolding, which would normally have been needed for the survey too. To avoid an extended period of restricted access for other works, Selectaglaze worked with Coulson to devise a survey method that didn't require scaffolding, saving both time and cost.

The cartwheel frame

The most complex treatment was a large circular primary window in the nave, due to its shape and prominent position near the roofline. Drawing on previous experience with a similarly large circular window, Selectaglaze crafted a timber mullioned cartwheel frame to hold the secondary glazing securely. The timber subframes were built in segments, each mullion split so it could be screwed together within the window opening during installation, forming the cartwheel frame. Seven bespoke Series 46 fixed-light segments were made for it and glazed with 6mm toughened glass for added rigidity and strength.

A warmer church for the community

Downing Place United Reformed Church was delighted with Selectaglaze's work, especially how well the secondary units blended seamlessly with the stone surrounds. With less heat escaping and draughts all but eliminated, Downing Place URC has already seen a reduction in heating costs, and the church is now a warmer, more comfortable space for the community to gather, dine, and worship. Managing a historic church building? Talk to Selectaglaze about secondary glazing for your project.