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This is not quite a straightforward question to answer, as many factors will affect the decision. However, Kemperol is a hugely versatile waterproofing material with primers suited to different substrates wherever this might offer a superior bond to the standard primer . This means that in the majority of cases there is no reason for the substrate on a leaking roof to be removed − Kemperol forms an immensely strong bond and will create a waterproof membrane that is elastic (so will withstand movement) yet is also permeable to vapour, allowing the roof to breathe. Where existing roof materials are to be covered, it is important to ensure substrate is sound, free from loose material, clean and dry. Even previous repairs and damaged substrates may be covered with confidence, for Kemperol will bridge cracks and tears up to 2mm, whilst anything larger can easily be made good on site using a mix of resin and kin−dried sand − your contractor would be able to advise on this, following an initial site visit. And because Kemperol is a lightweight repair system, it is highly unlikely that the existing supporting structure will need to be strengthened in order to accommodate the additional loading of the Kemperol membrane. |
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