General Contractor License Materials and Methods of Construction

Question 1

What is the standard compressive strength (f'c) of normal-weight concrete used in residential foundations?

Accepted Answer

3,000 psi

Answer

3,000 psi is the most commonly specified compressive strength for residential foundations, providing adequate load capacity for typical structural demands.

Question 2

Which lumber grade designation indicates the highest structural quality for dimensional framing lumber?

Accepted Answer

Select Structural

Answer

Select Structural is the highest grade for dimensional lumber, offering the best combination of strength, stiffness, and appearance with minimal defects.

Question 3

What does the designation 'W8x31' refer to in structural steel?

Accepted Answer

A wide-flange beam 8 inches deep weighing 31 pounds per linear foot

Answer

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.

Question 4

Which mortar type is recommended for load-bearing exterior masonry walls in moderate climates?

Accepted Answer

Type N

Answer

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.

Question 5

What is the primary purpose of a vapor retarder installed in a wall assembly?

Accepted Answer

To limit moisture migration into the building envelope

Answer

Vapor retarders control moisture diffusion through wall assemblies, preventing condensation within the envelope that could lead to mold and structural damage.

General Contractor License Practice Test

General Contractor License Practice Test

General Contractor License Materials and Methods of Construction