Commercial roofing in Pasadena Hills, FL

Florida requires a new low-slope roof to have at least a one-fourth unit in 12 slope, which is about 2 percent. That floor covers built-up, modified bitumen, single-ply, spray foam and liquid-applied systems. Ask bidders to state the design slope on the drawings, and ask who will check ponding water after heavy rain.

Pasco County drew a federal disaster declaration after Hurricane Hermine in 2016, when the Anclote River reached major flood stage. Heavy rain is a known local event, so drainage on a flat roof deserves a written answer. The code treats positive drainage as clearing the roof within 48 hours of rain, and it requires secondary overflow drains or scuppers where a parapet could trap water.

• Which membrane standard the bidder will use, such as ASTM D4637 for EPDM or ASTM D6878 for TPO
• Whether the design slope and drain sizing appear on the proposal
• Whether an existing roof will be recovered or torn off to the deck
• Which party will file the permit application and sign the owner's paperwork

Florida's 25 percent rule limits repairs or replacement to 25 percent of the roof area in any 12-month period unless the entire roof system is replaced. A property manager planning phased work should count the areas repaired each year against that limit, and should confirm the arithmetic with the county.

Rooftop equipment such as HVAC units is not forced to meet current code during reroofing unless it is replaced or moved and is not compliant. Note any equipment on the roof in the scope so the bidder can price around it.