Which statement about decking on a conventional flat roof is true?

Which statement about decking on a conventional flat roof is true?

• A. Decking can be 1x6 sheathing or plywood or both
• B. Decking is always plywood
• C. Decking is always metal
• D. Decking is not used on flat roofs

Answer: (A)

Decking is the structural surface the roof covering sits on. On a conventional flat roof, you’ll typically see either 1x6 wooden deck boards or plywood sheathing, or sometimes both—depending on when the building was built and how the roof was finished. The 1x6 boards provide a planked deck, a traditional method, while plywood offers a uniform, continuous substrate that’s common in modern constructions. Both ways serve the same job: creating a solid base to attach the roofing material and transfer loads to the joists. While metal decking exists in some roof systems, it’s not the standard for a conventional flat-roof setup, and saying decking isn’t used at all isn’t accurate.

Decking is the structural surface the roof covering sits on. On a conventional flat roof, you’ll typically see either 1x6 wooden deck boards or plywood sheathing, or sometimes both—depending on when the building was built and how the roof was finished. The 1x6 boards provide a planked deck, a traditional method, while plywood offers a uniform, continuous substrate that’s common in modern constructions. Both ways serve the same job: creating a solid base to attach the roofing material and transfer loads to the joists. While metal decking exists in some roof systems, it’s not the standard for a conventional flat-roof setup, and saying decking isn’t used at all isn’t accurate.