Flashing, Trim, and Accessories
Ridge cap, eave trim, rake trim, valley flashing, transition details, endlap sealant placement, and closure strip installation for metal panel roofing systems.
- Install ridge caps with proper overlap, sealant, and foam closure strips
- Detail eave trim and rake trim with correct fastener patterns and sealant placement
- Flash open and closed valleys on metal roofs using W-valley and panel trim methods
- Apply closure strips at ridge, eave, and transition locations to prevent wind-driven rain entry
Lección 1
Ridge Caps and Eave Trim
Ridge Cap Installation
The ridge cap is the formed metal piece that covers the peak of the roof where two opposing panel slopes meet. It is both a weather seal and a ventilation component (if vented ridge is specified). Ridge caps are typically formed from the same material and finish as the roof panels and are available in widths of 10-14 inches (measuring from the centerline to each edge).
Ridge cap sections are overlapped a minimum of 6 inches and installed with the lap facing away from the prevailing wind direction. Butyl sealant tape is placed at the overlap to prevent water infiltration.
Foam closure strips are critical at the ridge. These are pre-formed foam pieces that match the panel profile (the rib pattern). They fill the gap between the panel surface and the ridge cap, preventing wind-driven rain, insects, and debris from entering the building. Two types exist:
- Outside closures match the outside profile of the panel (ribs up). Used at the ridge under the ridge cap.
- Inside closures match the inside profile (ribs down). Used at the eave inside the panel.
Eave Trim
Eave trim (drip edge) is installed before the panels and provides a clean termination at the eave. The trim directs water into the gutter and prevents wind-driven rain from backing up under the panels.
Eave trim is fastened to the eave purlin or fascia board at 12 inches on center with panel-matching screws. The roof panels extend over the eave trim by 1-2 inches to ensure water drips off the panel onto the trim rather than running back under the panel.
Inside closure strips are placed at the eave, under the panel, to seal the gap between the panel profile and the eave trim. Without closures, wind-driven rain can enter the building at the eave.
Ridge caps overlap a minimum of 6 inches with butyl sealant at laps. Foam closure strips must match the panel profile - outside closures at the ridge, inside closures at the eave. These small components prevent the majority of wind-driven rain leaks.