Framing & StructuralQuestion 356 of 700
Why is vinyl siding fastened so that the panels can move slightly (nails not driven tight) rather than pinned firmly?
a.To make installation faster only
b.Because vinyl is structural sheathing
c.To allow for thermal expansion and contraction so panels do not buckle or crack
d.Because vinyl needs no water-resistive barrier
Explanation
Vinyl expands and contracts significantly with temperature, so nails are left slightly loose and centered in slots to let the panels move; pinning them tight causes buckling in heat and cracking in cold. Speed, structural function, and skipping the WRB are not the reasons for loose fastening.
Law Reference: 2025 CA Residential Code §R703.4Practice all 700 questions free — no signup required.
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