Melting/slumping of bitumen in torch-on bitumen roofing membrane

Causes

UV exposure

The membrane is at the end of its serviceable life

Listed under: membranes, Roof, cladding, roof cladding

Cause

UV exposure

Repair

  • membrane manufacturers/suppliers typically train and license applicators in the use of their membranes. Repairs or replacements should also be carried out by these trained/approved applicators. Work that is incompatible with the original membrane system may void the warranty and may make the problem worse

  • where the problem is severe and extends over a wide area of roofing, replacing the whole membrane may be a better long-term solution than just a repair

  • application or replacement of roofing membranes is restricted building work and, if done by tradespeople, must be carried out or supervised by a licensed building practitioner with the relevant licence class for that type of roofing

  • if the existing membrane must be replaced, and it has not met minimum Building Code durability provisions applicable (15 years), a building consent will be required

  • carry out regular maintenance as recommended or required by the manufacturer/supplier

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Cause

The membrane is at the end of its serviceable life

Repair

  • the membrane will need replacing – follow the guidance in the first repair above

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