Lift motor room in central Wellington.
The rubber membrane has lifted off and there are some rips in the rubber, the edge cap flashing has been half replaced on the inside, but rusty on the outside. At this point the only thing stopping the rubber blowing away altogether is the mechanical attachment of the edge flashings.
Quite an old roof, the rubber was laid on building paper nailed to the timber boards, this practise is no longer acceptable as the building paper is does not have the strength to resist wind uplift on its own.
The system we installed comprised;
Index Rollbase fleece backed base sheet mechanically fixed with LH stainless nails at 300mm centres, with heat welded laps.
Viking Bituclad 3mm torchon underlay dressed around the edges and over the waterchecks.
Same underlay torched to the rollbase, at right angles for increased cross laminated strength.
Viking Bituclad 4mm Grey Mineral Cap sheet torched to underlay.
Welted drip edges formed over the waterchecks and back onto the roof,
You may see some ropes in the images, these are safety lines for attachment of a full body safety harness worn by the applicator during the work.
hover cursor over image for text, click on them for larger version
There was still some ponding on the roof, about half the depth once the drain had been refixed, but without a total rebuild of the deck……
With 3 layers of membrane with a total thickness of 9mm, this roof should see out another 15+years.