The BSI ‘A’ rated Conservation™ box sash timber windows by Mumford & Wood

The BSI ‘A’ rated Conservation™ box sash timber windows by Mumford & Wood

The latest news from Mumford & Wood announces the achievement of a BSI ‘A’ energy rating for the traditional timber Conservation™ box sash window. The company can now claim this consistently high rating across the entire Conservation™ range of products.

This flagship window is designed to directly replace an original box sash in older and period properties, or in new-build projects that are designed to achieve a truly traditional appearance with original features and operational functionality. Added to the latest in timber window technology, which benefits from double glazing, excellent thermal performance and improved security, the Conservation™ box sash is one of Mumford & Wood’s highest specification products and has been tested to meet BS 6375 part 1 and 2.

“The energy rating results are calculated using our standard sections with a high performance glazing system,” says Stuart Judge, Sales & Marketing Director, Mumford & Wood. “It’s a great result and we can now offer the best possible energy saving, period-replica, factory-finished window on the market. The overall frame U-value is 1.4W/m2K which is well within the current Part L Building Regulations.” The Conservation™ box sash also tested to air permeability Class 4 which is considered excellent for this design of window.

The Conservation™ box sash, almost indistinguishable from originals, features traditional weights, heavy duty brass pulley wheels and pre-stretched, durable nylon cords.

The distinctive deep moulded internal profiles are available in a choice of Ovolo, Lambs Tongue and Fine Lambs Tongue glazing bar profiles and are complemented with Mumford & Wood’s standard sealing Sashglide®.

Products in the Mumford & Wood Conservation™ range, which includes the traditional sliding sash, casements, French doorsets and entrance doors, are made from premium quality, clear-grade, engineered timber which achieves outstanding levels of strength, stability and durability.

Please talk to a member of the Mumford & Wood sales team on (01621) 818155, or visit for CAD drawing downloads, technical product information, case studies and applications.

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Mumford & Wood

Mumford & Wood

Mumford & Wood was established in 1954 to produce high quality joinery products using the best quality timber, traditional craftsmanship and an emphasis on attention to detail. It is now the UK's premium brand for bespoke timber sash windows, offering...
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T(01621) 818 155
 01621 818155 Tech Dept.
F(01621) 818175
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 Tower Business Pk, Kelvedon Rd, Tiptree, Essex, CO5 0LX


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