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Building Regulations Approved Document Part L Exceptions
Building Regulations Approved Document L (ADL) Part L2B: Conservation of fuel and power (Existing Buildings other than Dwellings) requires minimum U-values to be achieved. The regulations state that when refurbishing a flat roof, a check on the insulation within that roof must be made to ensure that it meets the requirements of Approved Document L 2006.
These requirements are that:
- A roof that already has insulation installed must achieve a U-value of 0.35 W/m²K
- A roof with no insulation must have insulation installed to achieve a U-value of 0.25 W/m²K
- A new build property / extension must have insulation to achieve a U-value of 0.20 W/m²K
- A roof repair that accounts for more than 25% of the individual roof area must comply with the new requirements
There are some exemptions, unheated parts of the home including garages and porches, some listed buildings, or where the payback period (cost of insulation versus savings made) exceeds 15 years to achieve. Any exemptions should be confirmed (we would strongly recommend that this is received in writing) by the Local Authority Building Control. Please contact your Local Authority Building Control office for further details and verification of the above information.
© 2006 Sarnafil Ltd. Legal Disclaimer
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