Essential properties for a roof – Part 2

The South African National Building Regulations (SANS 4.2) states that: Any roof covering and waterproofing system, or part thereof must:

Be capable of being effectively repaired despite aging of the material. Products used in roof coverings and waterproofing systems must preserve their properties satisfactorily with normal maintenance for at least 10 years for systems which can be readily repaired and 20 years for systems that are difficult to replace.

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