In louvers, where should the panel ideally be centered relative to the roofing material?

• A. On the left edge of the roofing material
• B. Centered on the decking material
• C. Centered on the roof sheathing
• D. Centered on the roofing material

Answer: (D)

Centering the louver panel on the roofing material ensures the opening lines up with the outer roof surface, so weatherproofing and venting match the roof plane. This placement provides even edge exposure for proper water shedding around the cut and minimizes gaps that could leak. Centering on decking or sheathing would place the panel away from the roof’s weather surface, increasing the risk of leaks and improper venting. Aligning with the roofing material also gives a stable support plane, helping the panel stay true under wind and fireground conditions.