Commercial roofing in Sanford, FL

Minimum design slope for new built-up, modified bitumen, single-ply, foam and liquid-applied roofs is one-fourth unit in 12. Where a parapet traps water, the code calls for secondary overflow drains or scuppers. Ask any bidder where the overflow sits and how drainage will be confirmed within 48 hours of rain.

Seminole County's rainfall normals show 54.03 inches a year at Sanford, with 24.49 inches falling in June through August. Ponding on a flat roof therefore gets tested every summer. Many of the county's units were built before 1980 (29.1 percent), so some older buildings may carry roofs that have been covered more than once.

A recover over the old roof is barred where the old roof has two or more coverings or is water soaked. A full tear-off to the deck is required there. Downtown Sanford was rebuilt in brick after an 1887 fire, and a bidder should check any roof deck on older masonry buildings before pricing.

• Name the system and its ASTM standard, such as D6878 for TPO or D4637 for EPDM.
• State the edge-metal wind test, ANSI/SPRI ES-1 or RAS 111.
• Say who pulls the permit, and who records the Notice of Commencement.
• List what happens to rooftop equipment that is replaced or moved during re-roofing.
• Check the roofing contractor's license on the state lookup before signing.

Neighbors in Winter Springs and Oviedo use re-roof affidavits, and Seminole County lists solar re-installation rules for re-roofs. Ask the City of Sanford Building Division whether it requires a similar form, because its page does not say.