Framing & StructuralQuestion 366 of 700
Why must deck framing lumber in contact with the weather and near the ground be pressure-preservative-treated or naturally durable?
a.To resist decay and insect attack in the exposed, moist environment
b.To make it lighter
c.To improve its color
d.To make painting unnecessary
Explanation
Exterior deck lumber sits in a wet, exposed environment where untreated wood rots and is attacked by insects, so it must be preservative-treated or a naturally durable species to last. Treatment is not about reducing weight, improving color, or eliminating the option to paint or finish.
Law Reference: 2025 CA Residential Code §R507.2Practice all 700 questions free — no signup required.
Related questions on this topic
- Where a deck beam bears on a supporting post, what is the BEST practice for the connection?
- Besides the ledger fasteners, the code requires a lateral load connection between the deck and the house structure. What does this connection primarily prevent?
- On a raised residential deck, guards are required, and the guard infill (balusters/pattern) must be designed so that which object cannot pass through?
- CALCULATION: A stairway must rise a total of 112 inches from finished floor to finished floor. Using the 7-3/4 inch maximum riser height, what is the MINIMUM number of risers required?
- CALCULATION: A stair has 15 risers. Using a 10-inch tread depth, what is the total horizontal run of the flight (number of treads times tread depth)?
- CALCULATION: A roof area of 200 square feet is subject to a net wind uplift pressure of 15 pounds per square foot. What total uplift force must the connections in that area resist?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB General Building (B) Trade Examination · How we review