Flashing a chimney on a steel roof involves installing metal pieces that direct water away from the chimney and prevent leaks where the chimney meets the roof. The two main types of flashing used are counter flashing and step flashing. Step flashing is attached to the roof and tucked under shingles, creating a layered water barrier along the chimney’s sides, while counter flashing is anchored to the chimney and overlaps the step flashing for added protection. This layered setup helps water flow smoothly down the roof without seeping into gaps. The reason flashing can fail or need repair often comes from poor installation, corrosion of metal parts, or roof movement causing gaps. A quick, safe way for homeowners to check for problems is to look for gaps, rust, or damaged flashing around the chimney, and also check inside the attic for any water stains or moisture near the chimney base.
If you notice any flashing issues or suspect leaks, it’s time to call a professional roofer experienced with metal roofing and chimney details. When discussing the job with your contractor, ask specifically how they’ll seal the flashing to the steel roof to prevent water intrusion and if they plan to use corrosion-resistant metals like aluminum or stainless steel to extend the flashing’s lifespan. Also inquire whether they’ll ensure the flashing details meet local building codes and do not void your roof warranty. Properly installed flashing on a steel roof requires skill to avoid damaging the panels, so trust a roofer with experience in metal roofing to ensure a secure, warranty-safe job that will protect your home from leaks for years.