Manthorpe’s revolutionary loft door sets new standards for airtightness

Manthorpe, the Derbyshire based manufacturer of plastic building products, has announced the launch of a new loft door to replace its best-selling GL250-03.

The new GL 250 has many innovative features that improve the ease of installation and the products’ insulation values; in fact, in tests conducted by the BRE the new door outperformed all major competitor doors that were tested and was the only door to meet and exceed the requirements of British standards and current building regulations. There is virtually no air leakage at all. All variants of the GL250 are fully insulated and available with a range of insulation levels including the GL250-015 which provides insulation level of 0.15W/m²K.

The new GL 250 is now available through all good builders merchants and distributors. You can also see it in action on the website – visit or call 01773 514200 to see sample.