The short answer
Find the Exact Leak Source
Start by going into your attic or crawl space on a dry day. Look for water stains, rust trails, or light coming through the roof. Metal roofs leak most often at fastener heads, seams, or around flashing and vents. Mark the spot with chalk or tape so you can locate it from the outside.
On the roof itself, inspect the area around your mark. Check for loose or missing screws, popped fasteners, or separated seam laps. Also look for punctures or corrosion, especially where the metal meets a chimney or wall. A small hole can be patched, but widespread rust may mean a larger repair.
- Water stains on your ceiling or rafters
- Rust or discoloration around fasteners
- Gaps in the seam or lap joints
- Cracked or missing sealant around flashing
- Punctures from hail, branches, or foot traffic
Temporary Fixes That Hold
For a quick stop, dry the area around the leak with a towel. Apply a generous layer of roofing cement or butyl sealant over the hole or seam. Press a piece of metal flashing or a patch of rubberized tape over the sealant. This can hold for days or weeks, giving you time to plan a permanent repair.
If the leak is around a fastener, remove the old screw, apply a dab of silicone sealant into the hole, and drive a new screw with a rubber washer. For small punctures, a self-tapping screw with a neoprene gasket can seal the gap. These fixes are temporary, not a substitute for proper repair.
When to Replace Panels or Seams
Temporary patches work for minor issues, but a metal roof that is rusted through or has split seams needs new panels. If the metal is thin or brittle, screw holes may not hold a new fastener. In that case, you may need to replace entire sheets or sections. Measure the panel width and length before ordering replacements.
For seam leaks, you can often re-crimp the standing seams with a hand seamer. Apply a bead of sealant along the seam before crimping. If the leak is at a penetration like a vent or pipe, remove the old flashing, clean the area, and install new flashing with a proper sealant. This is detailed work that requires care.
- Rust that flakes or holes larger than a pencil eraser
- Seams that have opened more than a quarter inch
- Fasteners that no longer grip the metal
- Metal that bends or flexes under light pressure
Safety First on a Metal Roof
Walking on a metal roof is slippery, especially when wet or covered with dew. Wear rubber-soled shoes and use a roof ladder or safety harness. Never work on a metal roof during rain, high wind, or after a thunderstorm. If your roof has a steep pitch or you feel unsteady, stay off and hire a professional roofer.
Metal roofs can be sharp at the edges. Wear heavy gloves and long sleeves to avoid cuts. Also be aware of overhead power lines if you use a ladder. If you live in Rockwall, spring storms bring hail and thunderstorms, so check the forecast before climbing up. A fall is the biggest risk, so don't take chances.
When to Call the Pros
If the leak is large, you can't find the source, or the roof is too steep to access safely, call local water damage pros. They have the equipment and experience to locate hidden leaks and perform repairs. They can also address any water damage already done to your insulation, drywall, or framing.
Water damage from a roof leak can spread quickly, leading to mold and rot. The pros can dry out the affected areas and help prevent further damage. If you have insurance, check your policy to see what is covered. Policies vary, and your insurer decides what is covered. Acting quickly can reduce the overall mess.
Talk to someone now
Phones are answered 24/7 for Rockwall and nearby communities.
Call Now (469) 698-4610Frequently asked questions
Can I patch a metal roof leak from the inside?
Yes, you can apply a temporary patch from inside using roofing cement or a rubber patch. This can stop the drip for a while. But it won't fix the source. You still need to address the outside to prevent water from seeping into the roof structure.
How long does a temporary patch last?
A well-applied temporary patch can last several weeks to a few months, depending on weather and the size of the leak. But it's not a permanent solution. Heat and UV will degrade the sealant over time. Plan to do a proper repair or hire a pro before the next storm season.
What if the leak is in a seam that keeps opening?
If a seam keeps opening, the metal may be expanding and contracting with temperature changes. You might need to add a flexible sealant that can move with the metal. Or the seam may be too damaged to hold. In that case, replacing that section of roof is the reliable fix.