Insulated Flat Roof with Electronic Leak Detection — PVC Membrane
63–67 Pavilion St, Queenscliff, Sydney · Subcontracted full roof waterproofing build-up for Trademark Restoration Services
Prepared roof deck — screed to specified falls, ready for waterproofing
The object
A residential building in Queenscliff, on Sydney’s northern beaches. This flat roof is the next stage of a larger project for Trademark Restoration Services — we previously completed the building’s large, structurally complex rooftop planter box with extensive detailing.
The problem we solved
The roof required a full warm-roof build-up over occupied apartments: reliable waterproofing, thermal insulation for energy performance and building protection, and — critically — the ability to locate any future leak precisely, without destructive investigation.
Our scope of works
Trademark installed the dry screed to correct, standards-compliant falls. Our scope is the full waterproofing build-up: primer and a self-adhesive (peel-and-stick) vapour barrier, thermal insulation over it, then a specialised conductive metal mesh layer with wired contacts for electronic leak detection, and finally an adhered PVC sheet membrane — hot-air welded, with all upstands, penetrations and terminations detailed and sealed.
Special features / difficulty
A layered warm-roof system where each layer must be installed correctly for the next to perform — and a first for us in build-up terms: the integrated conductive mesh for electronic leak detection has to stay continuous and correctly wired beneath the membrane. Multiple penetrations, plant, glazed balustrades and planter interfaces required careful detailing.
The result
In progress. On completion the building gets a fully welded, insulated PVC roof with electronic leak detection built in — so any future defect can be pinpointed with detection equipment instead of exploratory demolition, plus the energy and durability benefits of a properly insulated roof.
