Materials & Equipment Knowledge Flashcards

What is the minimum compressive strength of concrete typically specified for residential foundations in most US building codes?

Answer: 2,500 psi

Residential foundation concrete is typically specified at a minimum of 2,500 psi compressive strength per most US building codes.

Which type of lumber grade stamp marking indicates the moisture content of the wood at the time of surfacing?

Answer: KD-19

KD-19 stamped on lumber means it was kiln-dried to a maximum moisture content of 19% at the time of surfacing.

What is the standard width of a residential interior door rough opening when the door unit is 32 inches wide?

Answer: 34 inches

A 32-inch door typically requires a 34-inch rough opening to allow for the frame, shimming, and installation clearance.

Which insulation material has the highest R-value per inch of thickness?

Answer: Closed-cell spray foam

Closed-cell spray polyurethane foam provides approximately R-6 to R-7 per inch, the highest of common residential insulation materials.

What does the term 'vapor retarder' Class I refer to in residential construction?

Answer: A material with a perm rating of 0.1 or less

Class I vapor retarders have a perm rating of 0.1 or less, making them the most effective at resisting moisture vapor transmission.

Which type of roofing underlayment is required directly beneath metal roofing panels on a residential structure?

Answer: Synthetic non-perforated underlayment

A non-perforated synthetic underlayment or appropriate felt is required under metal roofing panels to prevent moisture infiltration and reduce condensation.

What is the purpose of a weep screed at the base of an exterior stucco application?

Answer: To allow moisture trapped behind the stucco to drain out

A weep screed is installed at the base of stucco systems to allow any water that infiltrates behind the stucco to drain out and not accumulate.