Which deck material would not be appropriate for an asphalt shingle roof?

Which deck material would not be appropriate for an asphalt shingle roof?

• A. 1" x 6" spaced
• B. 1" x 6" solid
• C. plywood
• D. solid wood planking

Answer: (A)

Asphalt shingles need a solid, continuous deck to nail into and to provide a uniform surface for proper sealing and wind resistance. A deck built from 1x6 boards with gaps between them creates voids and an uneven surface, so shingles can’t seat or fasten securely, and moisture can seep through the gaps. The underlayment can’t reliably bridge those gaps, which increases the risk of leaks and wind uplift. Solid options like a continuous 1x6, plywood, or solid wood planking give a continuous, smooth backing that shingles can be nailed to and sealed against effectively.

Asphalt shingles need a solid, continuous deck to nail into and to provide a uniform surface for proper sealing and wind resistance. A deck built from 1x6 boards with gaps between them creates voids and an uneven surface, so shingles can’t seat or fasten securely, and moisture can seep through the gaps. The underlayment can’t reliably bridge those gaps, which increases the risk of leaks and wind uplift. Solid options like a continuous 1x6, plywood, or solid wood planking give a continuous, smooth backing that shingles can be nailed to and sealed against effectively.