You discover that the roof sheathing was installed with 3/8" OSB instead of the specified 1/2" OSB. The roofing contractor is ready to install asphalt shingles. What should you do?
Correct Answer
A) Remove and replace with proper 1/2" sheathing
The sheathing must meet structural requirements and building code specifications. Using undersized sheathing compromises structural integrity and code compliance, requiring removal and replacement with proper materials.
Why This Is the Correct Answer
Option C is correct because roof sheathing thickness is a critical structural specification that directly affects the roof's ability to carry loads and resist wind uplift. Building codes specify minimum sheathing thickness based on rafter spacing and expected loads, and using 3/8" instead of 1/2" creates a 25% reduction in thickness that compromises structural integrity. The only compliant solution is complete removal and replacement with the properly specified material to ensure code compliance and structural safety.
Why the Other Options Are Wrong
Option B: Allow installation since 3/8" is close enough
Adding furring strips does not address the fundamental structural deficiency of undersized sheathing. Furring strips are for creating air gaps or leveling surfaces, not for compensating for inadequate structural thickness.
Option C: Install additional furring strips over existing sheathing
This approach violates building codes and professional standards. A 1/8" difference in sheathing thickness represents a significant structural deficiency that cannot be overlooked, as it affects load-bearing capacity and wind resistance.
Option D: Add a second layer of 1/8" sheathing
Adding a thin layer of additional sheathing creates potential moisture trapping between layers and does not properly address the structural requirements. This approach also violates proper installation methods and could create delamination issues.
Memory Technique
Think 'STRUCTURAL = SPECIFIC' - structural components must meet exact specifications, no substitutions or shortcuts allowed.
Reference Hint
Florida Building Code - Residential, Chapter 8 (Roof-Ceiling Construction) and IRC Table R503.2.1.1 for roof sheathing requirements
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