Tear-off, underlayment and roof deck
Irving posts the code’s reroofing section, and under it a replacement removes the existing layers down to the deck. A recover over an existing roof is allowed in listed cases, including a complete standing seam system that carries roof loads directly to the structure, but not over a water-soaked or deteriorated roof, over slate or tile, or where two or more coverings are already in place.
Once the deck is bare, damaged sheathing is replaced and an underlayment suited to metal roofing goes down. Irving does not require an ice barrier, so the membrane is picked for summer heat under copper rather than for ice.
Wind, hail and the Irving code
Irving’s current code, adopted with local amendments from May 1, 2026, sets a design wind speed of 105 mph (3-second gust) with Exposure C, and clip spacing and the details at eaves, rakes and ridges follow that design. Hail is the other local test: NOAA’s storm database holds 196 hail reports for Dallas County from 2016 to 2025, 160 of them between March and June. Copper dents, and we never describe it as hail-proof or impact rated.
A new roof is the right time to add copper gutters and downspouts and to rebuild the copper chimney caps and flashing. If you already have a copper roof that leaks or took hail, see copper roof repair and hail damage.