Whether a re-roof needs an engineer depends on the building and the jurisdiction, but in South Florida, many do. The Florida Building Code's existing-building provisions, roof-to-wall connection requirements, and the roofing product's own approval frequently call for signed and sealed engineering.
This guide explains the common triggers. It is general information, not a determination for your building. We confirm what your specific project requires before starting.
Roof-to-wall connections and re-nailing
On many older homes, a re-roof triggers a requirement to verify and, where needed, strengthen the connection between the roof and the walls, and to re-nail the roof deck to current standards. Demonstrating that these resist uplift generally requires an engineered form or sealed detail.
Attachment and uplift
Roof-zone uplift pressures depend on the roof's shape, slope, and your wind zone, computed per ASCE 7-22. The fastening and attachment must be shown to resist those pressures and match the roofing product's approval, which is where a sealed uplift table and attachment schedule come in.
Secondary water barrier
The Florida Building Code requires a secondary water barrier on many re-roofs to limit water intrusion if the primary covering is lost. The applicable requirement is noted on the sealed set.
Questions
Does every re-roof in Florida need an engineer?
No. Some re-roofs are permitted without sealed engineering, while many, especially older homes and those in the HVHZ, require engineered connection, re-nailing, or attachment work. The requirement depends on the building and jurisdiction.
How do I know if mine does?
The building department and the roofing product's approval determine it. Send us the address and scope and we'll confirm whether your re-roof needs a sealed package before you commit.