Contractors Hacquoil and Cook used Knauf Insulation’s Polyfoam® Insulation to insulate the new roof of the prestigious St Brelade’s Bay Hotel on the island of Jersey. A combination of Polyfoam® Pitched Roofboard and Polyfoam® Raftersqueeze has been used in the steel-framed, pitched roof that adds five, two-bedroom penthouse suites to the hotel’s accommodation.
The new roof is primarily of steel-framed construction with timber infill rafters and dormers and a tiled outer skin. The original design specified two layers of Knauf Insulation’s Polyfoam® Pitched Roofboard – the first to be installed across the outer surface of the roof, the second between the rafters.
Specifically designed for pitched roof construction, Polyfoam® Pitched Roofboard is a rigid, high strength, extruded polystyrene board. Its strength, combined with rebated, shiplap edges on all four sides, means that joints between individual boards do not have to coincide with supporting timbers making it ideal for over-rafter, pitched roof insulation. ‘Cutting-out-the-cutting’ makes installation very quick – the boards are laid across the rafters, secured to them with spiral-type fixings and, that’s it!
But Hacquoil & Cook realised that a new product from Knauf – Polyfoam® Raftersqueeze – was the ideal product for the second, inter-rafter layer and recommended its use. Although made from the same extruded polystyrene as Polyfoam® Pitched Roofboard, deep grooves running parallel to the long edges of the board allow it to be compressed – ‘squeezed’ – across its width. This overcomes the common problems caused by irregularities in the timber: no fiddly, time consuming trimming, no gaps and instant retention. “It really wasn’t a difficult decision to make!” commented Dean Hacquoil, Hacquoil & Cook’s Managing Director, “Raftersqueeze was clearly designed for exactly this situation so it made sense to use it. It’s roughly cut to size and just push-fitted into place – its ‘compressibility’ does the rest by forming itself to match the contours of the timber.”
And, despite the miserable weather, the installation team commented on another feature of the product: even in mid-winter, its light-orange colour significantly reduced the amount of surface-glare usually associated with foil-faced insulation boards!
Knauf’s Foam Market Development Manager, Mark Thompson, was delighted to hear of the success saying, “Yes, it is a user-friendly solution and it’s great to hear that our products have saved time and effort on site! It demonstrates the benefits of the Polyfoam® Insulation range and shows how choosing the most appropriate thermal insulation can bring real savings for installers.”
But it’ll be a year before guests at the hotel feel the benefit of sleeping under two layers of Polyfoam® Insulation! With winter drawing to an end, building work has stopped for the summer season: the structure is complete; fitting-out will start later this year in time for a grand opening in the spring of 2005.
Knauf Insulation have published a comprehensive brochure – the Knauf Polyfoam Guide – along with a series of product specific datasheets that contain a wealth of information and make essential reading. Advice is also available from the Knauf Insulation Technical Advisory Service on 01744 693885.
For more details about Knauf Insulation products, or to obtain copies of their literature, please visit www.knaufinsulation.co.uk or call 08700 668 660 quoting ID: PU09304.
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