Steel roof and valley leaks often happen because these areas are naturally prone to water exposure and movement. Valleys collect the water runoff from two sections of the roof, making them vulnerable to leaks if the metal flashing wears down, gets bent, or isn’t properly sealed. Steel roofing can also leak around fasteners or seams where the protective coating might have been compromised, allowing rust or gaps to form. Over time, debris buildup in valleys can trap water or cause damage to the protective coatings, increasing the risk of leaks. Simple diagnostics you can do from the ground include checking for rust stains under the gutters or visible corrosion and looking for any missing or loose fasteners on the roof edges or valleys. Inside the attic, look for water stains or light coming through the seams. These observations can help you identify if the leak source might be the valley or the steel panels themselves.
For safe DIY checks, it’s important to avoid walking on the steel roof if you’re not confident, as it can be slippery and dent easily; instead, use binoculars for a close-up visual inspection. Cleaning out valleys gently to remove leaves and debris can help prevent leaks, as can applying a roofing-approved sealant around fastener heads if you spot minor issues. However, steel roofs require careful handling to maintain their manufacturer warranty, so extensive repairs or replacements should be left to a professional. When you call a roofer, ask if they have experience working with steel roofing and valleys, and whether they will inspect and reseal or replace valley flashing as part of the leak repair. Also, inquire if their work includes a warranty that won’t void your existing roof manufacturer’s coverage. This ensures you get a lasting fix without risking future issues.