When your roof begins to expose problems, rather than stripping it off and starting again, overlaying the existing one can be a more economical option.
Usually, the main benefit of a roof overlay system is that it is quicker and cheaper to install. Use of the building will be disrupted for a shorter period of time, if at all.
A roof overlay system could be worth considering for any type of existing roof. On pitched roofs, overlaying old sheets with new ones is common, though sheet metals and composite panels are other options.
A common motive for a flat roof overlay system is to create a surface safe for footfall or roof installations (HVAC, solar panels, telecoms.) However, overlaying roofing systems are contingent on your building’s capacity to support the weight of two roofs.
Other Overlay System factors to consider
The leading issues when overlaying roofing systems are the importance of adequate seals and flashings, not forgetting the eventual long-term replacement cost.
Fitting a roof overlay system is a job for experienced professionals. The existing roof needs to be fundamentally sound or adequately repaired before fitting the overlay. Access to flashing or broken panels becomes a bigger project once there is another layer on top. The second layer must also have competent flashing, especially around services that penetrate the roof such as vents and flues. These often require refitting or replacing.
In areas that suffer a lot of icy weather, both condensation and ice build-up between the two roofs are a potential problem. Experienced installers like Alpha Roofing & Cladding will identify the potentially problematic areas that other builders will miss, so always seek out professionals for overlaying roofing systems.
An overlay roof may last 20 years but remember that you now have two roofs to remove or repair.
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