A residential roof in South Florida requires wind resistance for 150 mph winds. What is the minimum requirement for asphalt shingle attachment?
Correct Answer
B) 6 nails per shingle plus sealant
In high wind zones like South Florida, asphalt shingles typically require 6 nails per shingle plus sealant to meet wind resistance requirements for 150 mph winds. This enhanced attachment method prevents wind uplift.
Why This Is the Correct Answer
Option B is correct because South Florida is designated as a High Velocity Hurricane Zone (HVHZ) where 150 mph wind resistance requires enhanced attachment methods. The Florida Building Code mandates 6 nails per shingle in high wind areas, positioned according to manufacturer specifications. Additionally, sealant strips or manual sealing is required to create a wind-resistant seal between shingle courses. This combination of increased mechanical fastening and sealing provides the necessary uplift resistance for extreme wind conditions.
Why the Other Options Are Wrong
Option A: 4 nails per shingle plus sealant
While 4 nails plus sealant provides some wind resistance improvement, it does not meet the Florida Building Code requirements for 150 mph winds, which specifically mandate 6 nails per shingle in high wind zones.
Option D: 4 nails per shingle
4 nails per shingle is the standard attachment for normal wind zones (typically up to 110 mph), but is insufficient for 150 mph wind resistance required in South Florida's HVHZ areas.
Memory Technique
Think 'South Florida SIX-pack' - in hurricane country, you need 6 nails plus the 'seal' (sealant) to keep your roof from 'popping' like a can.
Reference Hint
Florida Building Code Chapter 15 - Roof Assemblies and Rooftop Structures, specifically sections on wind resistance and HVHZ requirements
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