2024 Florida Roofing Code Changes

2024 Florida Roofing Code ChangesThe 8th edition of the Florida Building Code began implementation in December 2023 and, will continue through the first half of 2024, following the regular three-year update cycle. It’s part of a periodic update that takes place every three years. 

Last December 2023, the 8th edition of the Florida Building Code has been implemented. This building code is part of periodic updates every three years. 

Significant Changes in the 8th Edition

Roofing Changes

The 8th edition introduces revisions affecting roofing, construction, and design. To enhance roof durability and performance, updates regarding nail penetration and underlayment are included in the code. 25% of the roof replacement guidelines have been revised, eliminating certain scenarios, so roofing professionals must stay updated with these changes to comply well with the code.

Asphalt Installation & Underlayment

Section 1518.2.1 which addresses underlayment and asphalt installation has been revised. This update states that contractors must now use a dual layer of underlayment for metal, asphalt shingle, slate, tile shingle, and mineral-surfaced roll roofing.


The underlayment installed must be ASTM D8257, ASTM D226 Type II, or ASTM D4869 Type III or IV. Installation starts with a half-width of a full sheet at the eaves, followed by a full sheet that begins at the eaves. Subsequent underlayment courses must overlap half of a full sheet with an addition of 2”—successive courses overlapping half of a full sheet’s width plus an inch.

Roofing Application Standards

Section 1518.2.1 has two changes. The first one is that ASTM D6757 is now the new standard, replacing the  ASTM D6757. The second one updates nail penetration depths from 3/16” to 1/8” for consistency through sheathing or planks. 

Changes to RAS No. 120-20

The change to Roofing Application Standard (RAS) No. 120-20 addresses adhesive set and mortar tile applications. This change hopes to eliminate the term nail on systems with cap sheets and mechanically fastened base sheets set cold, hot, or self-adhered. 

The 25% Replacement Rule

The Florida Building Code has revised the 25% roof replacement rule, previously, roof companies were required to do a complete roofing replacement if more than 25% of a roof’s surface was damaged.

Homes with roofs installed after March 1, 2009, likely complied with the 2007 edition of the Florida Building Code and may repair damaged sections rather than replace the entire roof if damage exceeds 25%.

Homes with roofs installed before March 1, 2009, are still subject to the original 25% rule, requiring full roof replacement if damage exceeds 25%.

The goal of this update is to allow for an easier roof repair, offering property owners greater cost efficiency and flexibility. This update gives homeowners a more practical approach to repairing the damaged part rather than replacing the whole roofing system. 

Stay Compliant

Roofing contractors and homeowners need to be aware of the changes to the Florida Building Code in 2024. Keep in mind that with the discontinuation of the 25% Roof Replacement Rule in certain situations, it becomes even more essential to address roof damage promptly on behalf of homeowners.