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Roof Insulation and Warmroof
As listed on page 7, energy saving by roof and wall insulation is rated highly in the domestic energy sector and most people are familiar with laying rolls of insulation wool in the loft as illustrated below:
The Energy Saving Trust suggest that there can be a 15% saving in energy bills by using loft insulation:
An alternative method of roof insulation is to attach the insulation material in between the roof rafters so that the loft stays warm and can be used as additional living space. Such an installation, involving sprayed rigid polyurethane foam, was recently adopted by the author and Warmroof carried out this work.
New regulations demand that a thickness of 125 mm of insulation foam has to be used instead of a thickness of 40 mm previously used and this has meant an improvement in U-value to 0.20 Wm-2K-1 from 0.63 Wm-2K-1 ( measured values of thermal conductivity, Kappa, are 0.025 Wm-1K-1 ). With a composite roof cross-section of - insulation, breathable membrane, air gap and roof tile - the total U-value is close to that given in table 2, page 17 , of 0.14 Wm-2K-1.
Many people worry about condensation when added insulation is used in the home. However, the Warmroof sytem has approval from the BBA ( British Board of AGREMENT ) with regard to fire and condensation risks and the work has a
25 years guarantee which covers both materials and workmanship.
In the present case, the work was done in an entirely satisfactory manner and a photograph shows a final view of the loft interior:
For more details consult the Warmroof site.
Note added 9th May 09, it appears that Warmroof ceased trading on 16 March 09 but, undoubtedly, other firms giving similar service are still in business.
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