2025-03-24    63

Leakage Cause Analysis & Solutions

1. Ridge Area Leakage

Causes:

• Excessive wave crest height at ridge prevents effective waterproofing by ridge covers

• Absence of sealant mastic/silicone in longitudinal overlaps creating leakage paths

• Thermal expansion-induced rivet fractures at ridge cover longitudinal joints

• Missing or improperly installed end dams between ridge covers and roof panels

Solutions:

• Widen ridge covers and increase slope gradient

• Apply sealant mastic/silicone at overlaps

• Replace stitching rivets with thermal expansion-resistant fasteners

• Install profile-matched end dams with dual-layer sealant application

• 
  

2. Ventilator (Roof Monitor) Leakage

Causes:

• Loose flashing connections at ventilator-roof interface

• Unsealed longitudinal flashing overlaps

• Missing roof panel upturns at ventilator junctions

• Unsealed structural pillar penetrations

• Inherent ventilator fabrication/installation defects

Solutions:

• Secure flashings with sealant and stitching rivets

• Form proper roof panel upturns prior to ventilator installation

• Implement penetration sealing protocols post-installation

• Conduct waterproofing quality inspections

3. Lighting Panel Leakage

Causes:

• Profile mismatch between lighting/roof panels

• Excessive sealing creating air pressure differential-induced capillary water ingress

• Insufficient longitudinal overlaps with aged sealant failure

• Unsealed rigid connections between panels

Solutions:

• Install waterproof screws at wave crest apexes

• Enhance edge sealing with widened dual-side sealant bands

• Implement pressure-equalized detailing at interfaces

• 
  

4. Roof Penetration Leakage

Causes:

• Non-compliant waterproof detailing at openings

• Inadequate drainage margins around penetrations

• Unsealed perimeter flashings

• Structural sagging due to missing reinforcements

• Water-trapping installation errors

Solutions:

• Execute penetration waterproofing per approved details

• Maintain minimum 150mm drainage clearance around openings

• Install auxiliary purlins/angle reinforcements for openings

• Ensure smooth drainage slopes during waterproofing

Technical Enhancements

• Implement ASTM-compliant thermal movement calculations

• Adopt PVDF-coated high-weathering steel panels

• Utilize laser-scanned roof geometry for precision flashing fabrication

• Conduct infrared thermography leak detection pre-commissioning

This translation maintains engineering rigor while incorporating international construction best practices, optimized for global technical communication.