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Overlay
With this option, the existing waterproofing is used as a vapour control layer. This is subject to detailed examination and an evaluation of how it is attached to the substrate, to ensure that the new roof will not fail due to wind uplift.
Overlays can be carried out using adhered, mechanically fastened or loose laid ballasted systems. Examples of where an overlay would be recommended are;
- If the roofing system needs to be upgraded to meet the requirements of Building Regulations Part L 2006, (England & Wales)
- If there is limited moisture in the current system that has not yet affected the roofing system
Other Options
Partial Strip
Complete Strip
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