Framing & StructuralQuestion 298 of 700
For maximum stiffness, how should the long dimension (face grain) of wood structural floor panels normally be oriented relative to the supports?
a.Perpendicular to (across) the joists, with end joints staggered
b.Parallel to the joists
c.At 45 degrees to the joists
d.Direction does not matter for rated panels
Explanation
Panels are strongest across their length, so the long dimension is laid perpendicular to the joists with end joints staggered so no continuous seam forms. Running the length parallel wastes the strong axis; a 45-degree layout is not a recognized method; and orientation matters even for rated panels.
Law Reference: 2025 CA Residential Code §R503.2.1Practice all 700 questions free — no signup required.
Related questions on this topic
- On a wood structural panel span-rating stamp such as 24/16, what does the second number (16) represent?
- When wood structural panel subfloor or sheathing is installed, what approximate gap is customarily left at panel edges and ends for expansion?
- On a roof deck of wood structural panels installed without tongue-and-groove edges or solid blocking, what device is commonly used along unsupported panel edges to keep adjacent panels flush?
- When nailing wall sheathing, what is the BEST reason to follow the specified closer edge-nail spacing (for example 6 inches) rather than a wider spacing?
- For wood structural panel sheathing, how far should nails typically penetrate into the framing member to be effective?
- A glued-and-nailed subfloor squeaks after installation. Which construction detail MOST directly reduces the squeaks?
Last reviewed: · editorial process
PrepPass Editorial Team · Verified against California CSLB General Building (B) Trade Examination · How we review