Structural Systems Inspection Flashcards

When a double top plate is cut more than 50% of its width for piping, the IRC requires which reinforcement?

Answer: A galvanized steel strap at least 1-1/2 inches wide extending 6 inches each side

IRC R602.6.1 requires a 16-gauge, 1-1/2-inch-wide steel tie fastened across the cut, extending at least 6 inches on each side.

Wood-decay fungi generally need wood moisture content above about what level to grow actively?

Answer: 20%

Decay fungi generally need moisture content above roughly 19–20%, so moisture readings above that level are a warning sign.

Collar ties are typically located in which part of the rafter span?

Answer: Upper third

Collar ties sit in the upper third and help resist uplift and ridge separation, while rafter ties sit in the lower third.

A crawlspace pier has visibly tilted, and the girder above has slid partially off its bearing. How should this be reported?

Answer: As a significant structural defect needing evaluation by a qualified professional

Lost bearing under a girder can lead to partial collapse and calls for prompt professional evaluation.

Heaving and upward cracking of a slab-on-grade in a region with clay soils is most commonly caused by what?

Answer: Expansive soils absorbing moisture

Expansive clay soils swell when wet and shrink when dry, which lifts and cracks slabs and foundations.

Wire ties anchoring anchored masonry veneer to wood framing are generally spaced so that each tie supports no more than about how much wall area?

Answer: 2.67 square feet

IRC Table R703.8.4 limits each tie to about 2.67 square feet of wall area, with maximum spacing of 24 inches horizontally.

Which IRC deflection limit is commonly used for floor joists under live load?

Answer: L/360

Floors are typically held to L/360 under live load to limit bounce and cracking of finishes.