Materials and Methods of Construction Flashcards
7 cards from real General Contractor License practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Materials and Methods of Construction flashcards as text
What is the standard compressive strength (f'c) of normal-weight concrete used in residential foundations?
Answer: 3,000 psi
3,000 psi is the most commonly specified compressive strength for residential foundations, providing adequate load capacity for typical structural demands.
Which lumber grade designation indicates the highest structural quality for dimensional framing lumber?
Answer: Select Structural
Select Structural is the highest grade for dimensional lumber, offering the best combination of strength, stiffness, and appearance with minimal defects.
What does the designation 'W8x31' refer to in structural steel?
Answer: A wide-flange beam 8 inches deep weighing 31 pounds per linear foot
The W designation indicates a wide-flange shape; the first number is the nominal depth in inches, and the second is the weight per linear foot in pounds.
Which mortar type is recommended for load-bearing exterior masonry walls in moderate climates?
Answer: Type N
Type N mortar (1 part portland cement, 1 part lime, 6 parts sand) provides medium strength and good workability, making it ideal for above-grade exterior load-bearing walls.
What is the primary purpose of a vapor retarder installed in a wall assembly?
Answer: To limit moisture migration into the building envelope
Vapor retarders control moisture diffusion through wall assemblies, preventing condensation within the envelope that could lead to mold and structural damage.
What is the minimum rebar cover required for concrete in direct contact with the earth (cast against earth)?
Answer: 3 inches
ACI 318 requires a minimum of 3 inches of concrete cover for reinforcement cast against and permanently exposed to earth, protecting steel from corrosion.
Which roofing underlayment is classified as a self-adhering membrane often used in ice and water shield applications?
Answer: Rubberized asphalt membrane
Rubberized asphalt (SBS-modified) self-adhering membranes bond directly to the deck and self-seal around fasteners, providing superior protection in ice dam and leak-prone areas.