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Weather Testing / Thermal Efficiencies of our Doors

Posted on 11th June 2019

The average rainfall in the UK is between 700mm a year in East Anglia
and 3,000mm a year in the Scottish Highlands. So we’ve designed
our doors to be fully protected against extreme weather conditions.
Our doors are tested in a pressurised chamber to simulate
gusting winds starting at 63 miles an hour and up to 80 miles an hour
– that’s stronger than a hurricane. Then they are tested further by
spraying two litres of water every minute directly at the door in their
test chamber – that’s a serious amount of rain. So even when it’s cats
and dogs out there, your door will keep you snug and dry.

All of our doors exceed the current Building Regulations for energy efficiency, which came into force in October 2010, covering front doors for the first time. Under the legislation, all new doors sold and fitted in England and Wales must have a U-value of 1.8W/m2K (1.6W/m2K in Scotland) or less. The door’s U-value is a measure of its energy efficiency, and the lower the U-value, the more energy efficient the door.

Many manufacturers of doors made of timber, aluminium or PVC panels may struggle to meet the 1.8W/m2K requirement and many do not provide proof, although there are likely to be further energy efficiency revisions in upcoming legislation in 2016.

GRP – the longest product lifespan


Door type Expected life Maintenance
Softwood Door 25 Years Paint, 5 Years
Hardwood Door 35 Years Paint, 5 Years
Steel Composite Door 30 Years Wipe Clean
PVC Composite Door 25 Years Wipe Clean
GRP Composite Door 35 Years Wipe Clean
PVC Panel Door 20 Years Wipe Clean

Information from HAPM (Housing Association Provident Mutual) and BRE (Building Research Establishment)

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Honest Windows & Doors Ltd
27 Chapelstead

Company Registration Number: 11653002

Call us on 01942 660558

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