Commercial Weatherproofing — Penrose
Gutter membrane coating, flashing replacement, and targeted leak remediation for a commercial property in Penrose, Auckland.
Years of deferred maintenance had taken their toll
The building in Penrose had been experiencing persistent leaks. An inspection identified multiple failure points across the roof system — the kind that develop gradually when small issues go unaddressed.
Ponding Water
Standing water across the flat roof surface indicated poor drainage. Pooled water accelerates membrane degradation.
Failed Sealant & Seams
Cracked sealant at roof seams and exposed fasteners had created multiple water entry points.
Corroded Penetrations
Rusted vent penetrations with failed sealant and degraded membrane surrounds.
Edge & Gutter Deterioration
Corroded eave edges, failed protective coatings, and compromised gutter junctions at the perimeter.
Condition on Inspection
The following photographs were included with our quotation to document the defects requiring remediation.
Targeted repairs to restore weathertightness
We recommended addressing each failure point directly. The scope targeted the specific defects identified during inspection.
Gutter Membrane Coating
Silicone liquid membrane coating system applied to both gutters with fiberglass reinforcement at dropper outlets and pipe penetrations. Built up identified ponding areas and detailed membrane into all outlets and transition areas.
Apron Flashing Installation
Two new apron flashings installed at the western roof–wall junction, plus a custom-fabricated corner flashing at the internal wall interface. All junctions prepared and integrated with the existing roofing system to direct water away from the building.
Joint Sealing & Fastener Replacement
Up to 15 parapet and apron flashing lap joints riveted and sealed. Approximately 500 replacement roof screws installed across accessible roof areas to restore mechanical fastening integrity.
Membrane Repair at Parapet
Re-sealed the membrane-to-parapet wall junction where water pooling and separation had created a persistent leak path into the building envelope.
Work in Progress
Weathertight and back in service
All identified defects were remediated to a weathertight standard. The client received photographic documentation of work at each defect location, a marked-up plan showing treated areas, and a maintenance schedule.
Key Result
The roof was brought back to weathertight condition.
The photographs above document the work as it progressed — from the condition found on inspection through to the remediation work carried out by our team. Each defect location was treated, photographed, and recorded.
Site-specific safety plan prepared before work commenced. Service report provided on completion.
Related: East Tāmaki Repairs · Wiri Investigation · Roof Repairs & Maintenance
Does your commercial roof need attention?
We take the same approach to every building — identify the problem first, then fix it properly.