Waterproof decks – deteriorated patching
Cause
Incompatible patching material was used – for example, rubber membrane was used to patch a bitumen-impregnated membrane
Repair
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problems with waterproof deck membranes should be attended to without delay to avoid the risk of rainwater entering the building
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when damage is found to a deck membrane or repairs to a deck membrane, contact the manufacturer, supplier or installer of the original membrane for their advice
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membrane manufacturers and suppliers typically train and license applicators in the use of their membranes. A warranty may only apply where application or repair is carried out by someone licensed by the supplier. Suppliers typically provide materials for the repair of their membranes
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a deck membrane still under warranty should be repaired by the contractor who carried out the original membrane application or by another applicator approved by the membrane supplier
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installation and/or repair of membranes is typically not a DIY job. If repairs are made that are incompatible with the original membrane, the warranty for the original membrane may be void
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the fact that the waterproof deck has been patched may indicate that it is old or in poor condition. Depending on the circumstances, a better long-term option may be to replace the whole membrane rather than continue patching it
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check the condition of the membrane at least once a year to ensure there is no debris on it, no damage and no breakdown of the membrane surface