Asphalt shingles – ridges or peaks formed in the roof surface
Listed under: timber and wood-based, plywood, Roof, cladding, framing, roof space, roof cladding, asphalt shingles
Cause
Movement of the underlay
Repair
- the only satisfactory solution is to replace the roof, laying new shingles over a suitable (plywood) substrate; ensure that roof space ventilation is provided. If the old asphalt shingle roof has met minimum Building Code durability provisions (it has lasted at least 15 years) a building consent is not required; if not, a consent must be obtained before reroofing.
Cause
Timber sub-structure shrinkage
Repair
- the only satisfactory solution is to replace the roof, laying new shingles over a suitable (plywood) substrate; ensure that roof space ventilation is provided. If the old asphalt shingle roof has met minimum Building Code durability provisions (it has lasted at least 15 years) a building consent is not required; if not, a consent must be obtained before reroofing.
Cause
Inadequate ventilation of the roof space
Repair
- the only satisfactory solution is to replace the roof, laying new shingles over a suitable (plywood) substrate; ensure that roof space ventilation is provided. If the old asphalt shingle roof has met minimum Building Code durability provisions (it has lasted at least 15 years) a building consent is not required; if not, a consent must be obtained before reroofing.
Cause
Use of sarking (planks) instead of sheet plywood
Repair
- the only satisfactory solution is to replace the roof, laying new shingles over a suitable (plywood) substrate; ensure that roof space ventilation is provided. If the old asphalt shingle roof has met minimum Building Code durability provisions (it has lasted at least 15 years) a building consent is not required; if not, a consent must be obtained before reroofing.