Penetrations are weak points in the envelope if not flashed properly. Learn methods to seal around pipes, conduit, and equipment with confidence.
Overview
Penetrations introduce complex shapes into flat membranes, requiring multi-part flashing strategies. Standardized methods help installers avoid reliance on field improvisation. Pre-molded boots and tapes should be combined with sealants and WRB-integrated solutions.
Flashing Components
- Wrap-type boots: Flexible collars pre-sized for conduit and pipes
- Flexible tapes: Bond around base and integrate with WRB
- Liquid flashing: Fills gaps and transitions at irregular or clustered penetrations
🔍 Quick Picks
- Pipe Flashing Boot: Oatey Sure-Vent Flashing Collar
- Conduit Sealing Tape: 3M Flashing Tape
- Liquid Sealing Compound: Tremco ExoAir Liquid Flashing
Inspection Checklist
Ensure boots fit snugly and are properly adhered to the membrane. Use clamps or adhesives as recommended. Inspect for continuity with water and air barriers and test with smoke or spray tests in sensitive applications.
Conclusion
Flash penetrations with a complete system—not just caulk or tape. Use boots, reinforced tapes, and liquid sealants for robust, code-compliant seals at every pipe and wire transition.
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