CRC Materials & Equipment Knowledge 3

Question 1

What ASTM standard governs the testing and classification of exterior-grade plywood used in residential construction?

Accepted Answer

APA PS 1

Answer

APA PS 1 is the US Product Standard for construction and industrial plywood, governing grades, dimensions, and performance requirements.

Question 2

Which type of nail is most appropriate for fastening treated lumber in contact with the ground or concrete?

Accepted Answer

Hot-dipped galvanized or stainless steel nails

Answer

Hot-dipped galvanized or stainless steel nails are required for pressure-treated lumber because the treatment chemicals corrode lesser-coated fasteners.

Question 3

What is the typical R-value of a standard 2x6 wall cavity filled with fiberglass batt insulation?

Accepted Answer

R-19

Answer

A 2x6 stud wall cavity (5.5 inches deep) filled with standard fiberglass batt insulation achieves approximately R-19.

Question 4

Which copper pipe type has the thinnest wall and is typically used for interior water distribution in residential construction?

Accepted Answer

Type M

Answer

Type M copper has the thinnest wall of the three pressure-rated types and is commonly used for interior residential water supply lines.

Question 5

What is the standard slope (pitch) recommended for residential drainage of a concrete patio or sidewalk away from the foundation?

Accepted Answer

1/4 inch per foot

Answer

Concrete flatwork adjacent to a building should slope a minimum of 1/4 inch per foot (2%) away from the structure for proper drainage.

(CRC) Certified Residential Contractor Practice Test

(CRC) Certified Residential Contractor Practice Test

CRC Materials & Equipment Knowledge 3