Maintaining My Home

where the problem is extremely minor with no risk of leaks, watching to see whether it gets worse may be an appropriate first response

if the problem is serious or getting worse, and the membrane was installed in recent years, call the installer back. Roofs 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

note that under E2/AS1 since July 2005, 10 g, 50 mm stainless screws must be used to fix the substrate (17 mm H3 plywood ) to joists. Any contractor using nails after July 2005 could have some liability for repairs required unless the territorial authority approved the use of nails, which is unlikely

installation and/or repair of membrane roofs is typically not a DIY job. 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

if there is a habitable space beneath the deck, then work on the membrane will be restricted building work under the Building Act and anyone engaged to carry out this work must be a licensed building practitioner or be supervised by an LBP

it may be that the nails should be replaced with countersunk screws, or that the substrate itself needs to be replaced. In these cases, the requirements and recommendations of the membrane manufacturer should be followed