To attach metal roofing, you start by laying down underlayment, then secure metal panels with special fasteners, and overlap the seams tightly to block water. Metal roofing is a smart choice because according to industry data, metal roofing lasts 40 to 80 years, much longer than asphalt shingles. The installation process takes care and the right tools. A 1,700 square foot metal roof typically costs between $6,800 and $68,000 depending on the type and quality you pick. Let’s walk through how to do this right.
What Materials Do You Need?
Metal roofing comes in several types. According to RubyHome (2025), standing seam metal panels cost $10.00 to $17.05 per square foot, while corrugated metal runs $5.50 to $11.50 per square foot.
You will need underlayment, metal panels, fasteners, flashing, and sealant. Underlayment goes down first as a water barrier. Metal fasteners with rubber washers keep panels in place and stop leaks. Flashing covers edges and valleys where water could seep in.
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How Do You Install the Underlayment?
Start by cleaning your old roof. Remove debris and nails.
Roll out underlayment across the entire roof. This acts like a second shield against water damage. Overlap each row by six inches. Use staples or nails to hold it down loosely. The metal panels will hold the underlayment tight once installed.
What’s the Right Way to Attach Metal Panels?
Begin at the lowest edge of your roof and work upward. Snap a chalk line to keep panels straight. Place the first panel and use special metal roofing fasteners that go through the ribs of the panel into the roof deck.
Each fastener needs a rubber washer to seal around the screw hole. Fasteners should be spaced 24 inches apart along the ribs. Overlap the next panel by one full rib. This overlapping prevents water from running sideways under your panels. According to the National Association of Home Builders, the average U.S. roof size is 2,647 square feet or 26.47 squares, so a typical home job takes time but is doable.
Seal all overlapping seams with roofing sealant. This stops water from sneaking into the gaps.
How Do You Handle Edges and Valleys?
Install flashing along the edges and where panels meet valleys. Use the same fasteners as your panels. Seal all flashing seams with sealant.
At the roof peak, install a ridge cap that covers the tops of both sides. This is critical for stopping water at your highest point. According to This Old House (2025), metal roofing provides excellent weather resilience and fire resistance, making it a solid long-term investment for homeowners.
| Task | Time Per 100 Sq. Ft. |
|---|---|
| Underlayment | 30 minutes |
| Panel installation | 1 hour |
| Flashing and sealing | 45 minutes |
Metal roofing is tough work but worth the effort. Take your time with each seam and fastener. Proper attachment means your roof stays dry for decades.
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Connect with an experienced roofing contractor to discuss your roofing needs and schedule an inspection.