Roof-to-wall transitions are one of the most failure-prone areas in the building envelope. This article details how to properly terminate roof membranes at vertical walls to preserve waterproofing, air barrier continuity, and wind uplift resistance.
Common Failure Points at Terminations
Water infiltration often occurs at the base of walls, roof edge transitions, or where roofing terminates into EIFS, masonry, or metal panels. Improper priming, reverse laps, lack of backing support, and mechanical damage from cladding fasteners are typical causes.
Termination Detailing Techniques
- Mechanically secure the roof membrane with termination bars, then apply compatible sealant
- Install continuous counterflashing above termination bar to deflect runoff
- Overlap roof membrane with vertical wall air barrier using membrane-compatible primer and flashing tape
- Ensure positive drainage and slope away from wall base using tapered insulation
Membrane Compatibility and Sequencing
Confirm chemical compatibility between roof membrane (TPO, EPDM, PVC, mod bit) and the wall WRB/air barrier. Use termination bar fasteners that do not deform insulation or compress foam backers. Stagger joints and reinforce corners with pre-molded patches or field-fabricated layers.
Inspection and Long-Term Durability
Inspect for sealant continuity, membrane adhesion, and counterflashing securement. Check that termination bar fasteners are spaced per manufacturer guidelines and that no voids exist behind membranes. Reinspect during annual maintenance and after any high-wind or storm events.
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