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Commercial Roofing: What Insulation Do I Need?

Under Approved Document L of the Building Regulations 2006 for England and Wales, where more than 25% of a roof area on an existing building is being refurbished or replaced, it is a requirement that the insulation should be upgraded to meet the current requirement.

If such an upgrade is not technically feasible or would not achieve a simple payback of 15 years or less, the roof should be upgraded to the best standard that is technically and functionally feasible. In order to establish exactly what is required (and local interpretations of these regulations seem to vary) we recommend liaison with the appropriate local authority, before undertaking the work to ensure there is no future problem with selling the property if a suitable completion certificate cannot be obtained for the renovation works.

The introduction of insulation as part of a flat roof system (Liquid / Felt / Asphalt) provides many benefits. As well as saving money by reducing heating bills and improving the environment within the building, insulation also reduces the condensation risk which will enhance the performance and the life expectancy of the roof coverings.

Insulation is usually incorporated so that it sits on top of the roof structure to form a ‘warm’ or ‘inverted’ roof. In both cases the insulation helps to maintain the roof structure at a regular temperature which reduces the amount of movement and therefore the stress inflicted on the roofing membranes. This has the effect of increasing the life of the new waterproofing and thus reducing the cost over the long term.

If you want more information on Roofing Insulation? With over 40 years’ experience in the commercial roofing market, Maguire Brothers are more than happy to provide free advice.