Leaking Roof Above Mezzanine
Leaking Roof Above Mezzanine is a cosmetic roofing defect SURE inspectors have documented across 1 inspection report.
Causes
- Internal surface waterproofing has been applied to the internal face of the wall, which is not best practice as it does not address the source of water entry and may conceal ongoing moisture migration
- Sealant joints between wall panels are compromised, including evidence of duct seal applied along the wall (indicative of prior non-compliant patch repairs)
- The capping has not been fixed in accordance with standard metal roofing/cladding installation requirements (including AS 1562.1)
- The capping has not formed an effective pressure seal to the wall/joint, allowing wind-driven rain to enter behind the cladding
- Multiple installation and maintenance failures to the roof-to-wall junction and wall cladding joints
Symptoms to look for
- Water staining and moisture evidence consistent with water penetration from the uppermost wall joint
- Internal surface waterproofing applied to the internal face of the wall
- Evidence of water ingress internally to the rear wall of the warehouse
- Loose and inadequately fixed roof-to-wall capping
- Compromised sealant joints between wall panels
Remedies
- Rectification works should include reinstatement of compliant roof-to-wall capping and pressure seal detailing, replacement of missing and defective fasteners, repair/replacement of damaged capping, and rectification of all compromised panel joints using compliant flashing and sealing methods in accordance with NCC requirements and AS 1562.1.
- The wall system should be rectified externally by addressing the source of water ingress at the upper joint and roof-to-wall junction, ensuring the external envelope provides a durable and compliant weatherproofing outcome.
- Engage a suitably qualified and licensed roofing/cladding contractor to assess and rectify the rear wall and roof-to-wall junction.
- Rectification should include replacement of damaged roof sheeting, compliant repair of all penetrations (including air-conditioning service penetrations), replacement of defective fasteners and sealing washers, reinstatement of compliant flashing and capping details, and renewal of all deteriorated joint sealing systems in accordance with NCC requirements and AS 1562.1.
- Engage a suitably qualified and licensed roofing contractor (metal roofing specialist) to undertake a comprehensive roof assessment and carry out rectification works.
Include this check in your next inspection.
Typically a low-severity finding, but worth documenting before maintenance work. Every SURE inspection includes 12 months of free advice.
Curated entries in Roofing
- Curated 1–4/5Cracked Roof Mortar
Mortar bedding and pointing on tiled roofs cracks over time due to thermal movement and weathering. Cracked mortar at ridge caps, hip ends, and verge flashings allows water to track into the roof cavity, leading to ceiling staining, battens and top-plate decay, and eventual leak damage if left unattended.
- Curated 1–3/5Eave Lining Stains
Staining on eave linings is a visible indicator of past or ongoing water overflow - most commonly from blocked gutters allowing water to back up behind the fascia. We see this in 15.5% of Perth inspection reports, typically as a cosmetic flag that leads back to a maintenance root cause.
- Curated 2–4/5Leaking Gutters
Gutters that leak at joints, end caps, or through rust holes deposit water against fascias, eave linings, and wall cladding rather than routing it to downpipes and stormwater. Persistent wetting creates conducive conditions for fungal decay, borer activity, and termite attack at the roof perimeter - some of the most expensive structural repairs on a Perth home.
- Curated 2–4/5Cracked or Broken Concrete Roof Tiles
Cracked, chipped, or broken concrete roof tiles allowing water ingress to the roof space. Common defect in Perth and Sydney homes with concrete tile roofs, accelerated by thermal cycling and foot traffic during maintenance.
- Curated 2–4/5Deteriorated Ridge Capping Mortar
Crumbling or cracked mortar bedding on ridge capping tiles allowing water entry along the roof ridge line. Extremely common in Perth homes due to intense sun exposure and thermal cycling.
More from Roofing
- Cracked Roof Mortar1–4/5
- Eave Lining Stains1–3/5
- Leaking Gutters2–4/5
- Surface Rust on Guttering1–4/5
- Moss Build-up on Roof Tiles1–3/5
- Antenna Mounted in Roof Valley1–4/5