Structural Systems Evaluation Flashcards

During a home inspection, the inspector notices that the double top plate on a load-bearing wall has a large splice in both plates directly above a door opening. What is the structural concern?

Answer: Splices directly over openings weaken the top plate where load transfer is most critical

Top plate splices must be offset from each other and from openings; splices directly over headers interrupt the load path at a critical transfer point.

An inspector finds that a basement wall has been waterproofed on the interior using a crystalline waterproofing product. From a structural standpoint, what does this NOT address?

Answer: Lateral soil pressure that is causing the wall to bow inward

Interior waterproofing products address moisture intrusion but do nothing to relieve or resist the lateral soil pressure that causes structural wall movement.

When inspecting a home built on expansive soils (clay), an inspector should be especially alert to which structural pattern?

Answer: Differential heaving or settlement causing doors to stick and diagonal cracks at opening corners

Expansive soils swell when wet and shrink when dry, causing differential movement that leads to sticking doors, diagonal cracks at opening corners, and uneven floors.

An inspector observes that the anchor bolts connecting the sill plate to the foundation are spaced 8 feet apart throughout a house in a high-wind zone. What is the concern?

Answer: Inadequate anchor bolt frequency reduces resistance to uplift and lateral forces from wind loads

In high-wind areas, anchor bolts must be spaced closely enough to resist uplift and shear forces; 8-foot spacing is typically inadequate and reduces the connection's structural capacity.

What does the term 'cripple stud' refer to in wood-frame construction?

Answer: A short stud above or below a window or door opening that transfers loads to the header or rough sill

Cripple studs are short vertical framing members above door/window headers and below window rough sills that complete the wall framing around openings.

An inspector observes that a wood deck is attached to the house with only nails through the ledger board into the band joist. Why is this a significant structural deficiency?

Answer: Nails can withdraw under repeated joist uplift forces, and the connection lacks resistance to ledger separation under deck loads

Ledger boards must be attached with through-bolts or approved structural screws because nails lack adequate withdrawal resistance and can pull out under sustained or dynamic deck loads.

When evaluating a post-and-beam structure, an inspector notices that the beam-to-post connection relies solely on gravity (the beam simply rests on top of the post with no mechanical connection). What is the structural limitation?

Answer: The connection provides no resistance to uplift forces from wind or seismic events

A gravity-only connection transfers compressive loads adequately but provides no uplift resistance, making the structure vulnerable to overturning or uplift forces from wind or seismic activity.