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Distinctive Doors—Specialist Suppliers of Domestic Doors
Opening Times: Mon–Thurs: 8am–5pm; Fri: 8am–4pm; Sat: 8am–12:30pm
Distinctive Doors, Units 14 & 15 Chambers Way,
Newton Chambers Road
Chapeltown,
Sheffield,
South Yorkshire S35 2PH
Email: sales@distinctivedoors.co.uk
Tel: 0114 220 2250 | Fax: 0114 220 2254
U Value
U-VALUE AND WHAT IT MEANS TO YOUR PROJECT
The following table is set out in Building Regulations Document L1B.
| Fitting | (a) Standard for new fittings in extensions | (b) Standard for replacement fittings in an existing dwelling |
Window, roof window and roof light |
U-Value = 1.8W/m²K or Window Energy Rating = Band D; or Centre-pane U-Value = 1.2W/m²K |
U-Value = 2.0W/m²K or Window Energy Rating = Band E; or Centre-pane U-value = 1.2W/m²K |
Doors with more than 50% of their internal face area glazed |
2.2W/m²K or centre-pane U-value = 1.2W/m²K |
2.2W/m²K or centre-pane U-value = 1.2W/m²K |
Other doors |
3.0W/m²K |
3.0W/m²K |
The following is general advice given by Jeld Wen:
What does it mean to our customers?
There are now different requirements for Replacement, Extension and New Build frames and doorsets.
Understanding that there IS a difference. We have to know the project type to give the best quotation & price compliant product.
Part L 2006 Windows
In simple terms:
Replacement windows; no change from 2002
Maximum U-Value = 2.0 W/m²K or an Energy Rated window E or better (where A is best). A centre pane (glass only) U-Value of 1.0
Extensions (ex. conservatories) to existing buildings
Maximum U-Value = 1.8 W/m²K or an Energy Rated window D or better (where A is best). A centre pane (glass only) U-Value of 1.1.
New build: Determined by Building Design
U-Value (range) = from 1.1 up to 2.2 W/m²K (weighted average).
Summary
Is it a replacement? – Maximum U-Value of 2.0
Is it an extension to an existing building? – Maximum U-Value of 1.8
Is it a new build? – The customer must provide the U-Value
Part L 2006 Doors
Replacements & Doors in extensions (to existing dwellings);
Maximum U-Value = 3.0 W/m²K where glazed area of door & frame is less than 50%
Maximum U-Value = 2.2 W/m²K where glazed area of door & frame is greater than 50%
New build: Determined by Building Design
U-Value (range) = from 1.1 up to 2.2 W/m²K (weighted average)
Summary
Is it a replacement? Has the door & frame a glazed area more than 50% glass?
YES = Maximum U-Value of 2.2
NO = Maximum U-Value of 3.0
Is it an extension to an existing building? – Same as above
Is it a new build? – The customer must provide the U-Value
