Which statement correctly matches a roofing-related specification?

Which statement correctly matches a roofing-related specification?

• A. Cellular-glass board insulation has an R-value of 3.44.
• B. Pump jack scaffold maximum load is 1000 lbs.
• C. Aluminum zinc coated steel flashing minimum thickness is 0.0200 inches.
• D. Thermoplastic single-ply roof coverings obey ASTM D6755.

Answer: (A)

R-values measure thermal resistance and guide insulation choices in a roofing assembly. Cellular-glass board insulation has a fixed R-value per inch, and a figure around 3.44 is a standard value you’ll see on product data sheets. This means a sheet of cellular glass provides about 3.44 units of resistance for each inch of thickness, which is why the statement matches typical roofing specifications. The other options describe scaffold loads, flashing thickness, or ASTM standards that don’t align as cleanly with a specific roofing specification in the same way, since those details can vary by equipment, application, or product. So the R-value statement best matches a roofing specification.

R-values measure thermal resistance and guide insulation choices in a roofing assembly. Cellular-glass board insulation has a fixed R-value per inch, and a figure around 3.44 is a standard value you’ll see on product data sheets. This means a sheet of cellular glass provides about 3.44 units of resistance for each inch of thickness, which is why the statement matches typical roofing specifications. The other options describe scaffold loads, flashing thickness, or ASTM standards that don’t align as cleanly with a specific roofing specification in the same way, since those details can vary by equipment, application, or product. So the R-value statement best matches a roofing specification.