Commercial roofing in Casselberry, FL

Water covers 7.2 percent of Casselberry's total land area, about 0.5 of 7.5 square miles, which is a lower share than the county's 10.4 percent. Commercial roofs here still need drainage that clears water within 48 hours of rain, since positive drainage is defined that way in the code.

New low-slope roofs need a minimum design slope of one-fourth unit in 12, which is 2 percent, for built-up, modified bitumen, single-ply, spray foam and liquid-applied systems. Ask any bidder to show the slope in the plan set, and to show where secondary overflow drains or scuppers sit where a parapet could trap water.

• Confirm the design slope is shown in the bid drawings.
• Confirm overflow drains or scuppers are shown where parapets can trap water.
• Ask how the bidder handles existing ponding before work starts.

Florida law separates roofing work from general contracting. A general building contractor working in Casselberry must subcontract roofing unless that contractor holds its own roofing certificate or registration. Ask each bidder to name the state license under which the roofing work will be done.

Check each bid for product approval. A product may not be advertised as wind-borne debris protection unless it is approved under Florida law. You can search the Florida Building Commission's product approval database by FL number, manufacturer or code version.