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Approved Document L 2010 and doors

From 1 October 2010 the new version of the Approved Document L comes into effect. This applies to both new construction and replacement installations.

There will be a requirement for doors with a glass area less than 50% to achieve a U value of 1.8 or lower. The same rule applies to doors with a glass area greater than 50%. Doors with an area greater than 50% glass tend to be a patio sliding door or a pair of double doors (French Doors).

The legislation requires doorsets with a glass area greater than 50% to be registered with a third party certification scheme (such as FENSA or CERTASS) or directly with building control if supplied in a replacement installation (this has not changed from the 2006 regulations).

Unfortunately there appears to be a discontinuity in the legislation. While there is a requirement placed on the U value of doors with glazing less than 50% in the regulations, there is no reference made to any controlling scheme such as FENSA etc. and so no requirement for registration. The doors supplied still have to comply with AD L 2010 with a U value of 1.8 or less (Scotland has a different requirement, U value of 1.6 or less) and evidence of compliance needs to be available to support the claim.

How long the Government will allow this to continue is at present unknown. The Association of Composite Door Manufacturers will lobby for this to be amended as soon as possible to assist both
the homeowner, who replaces their doorset, and reputable manufacturers.

The ACDM suggest that when a consumer places an order, after the 1 October 2010 they request evidence of the doorset that they are purchasing has a manufacturer’s declaration of the U value.



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