09/10/2026
4 rules for leak-resistant metal roof pe*******ons
Every roof pe*******on creates a potential weak point.
For standing seam roofing, four principles make the biggest difference:
1. Keep pe*******ons out of major water paths
Avoid valleys, gutters and areas where runoff concentrates whenever possible.
2. Raise and redirect water
Use formed curbs, boots or flashings that divert water around the pe*******on.
3. Allow the roof to move
Metal roofs expand and contract. Pe*******on details must not lock the panel in a way that creates stress or tears the waterproofing.
4. Treat sealant as secondary protection
The flashing geometry should do the main waterproofing work. Sealant supports the detail — it should not be the detail.
A well-designed pe*******on can remain serviceable for years. A poorly planned one can become the first place a roof starts leaking.
*******on