CRC Foundation & Structural Systems 3

Question 1

What is the primary purpose of installing perforated drain tile (drainage pipe) around the perimeter of a residential foundation?

Accepted Answer

To collect and redirect groundwater away from the foundation before it can penetrate

Answer

To supply irrigation water to landscaping around the home

Answer

To prevent frost heave by keeping soil at a uniform temperature

Answer

To provide a pathway for radon mitigation from under the slab

Question 2

What is the difference between 'dampproofing' and 'waterproofing' a residential foundation wall?

Accepted Answer

Dampproofing resists soil moisture vapor only, while waterproofing resists liquid water under hydrostatic pressure

Answer

Dampproofing uses a thicker membrane and is used on below-grade walls only

Answer

Waterproofing is applied to the interior and dampproofing to the exterior of the foundation

Answer

They are interchangeable terms for the same treatment under the IRC

Question 3

Which symptom is most characteristic of differential settlement in a residential structure?

Accepted Answer

Diagonal stair-step cracks at the corners of windows and door frames

Answer

Uniform horizontal cracking running the length of interior drywall

Answer

Horizontal cracks along the mid-height of basement concrete block walls

Answer

Vertical cracks in exterior fiber cement siding panels

Question 4

Per the IRC, what is the minimum required height that the top of a foundation wall must extend above the finished grade adjacent to the wall?

Accepted Answer

6 inches

Answer

4 inches

Answer

8 inches

Answer

12 inches

Question 5

What is the purpose of a capillary break (such as sill gasket or roofing felt) installed between a concrete foundation wall and a wood sill plate?

Accepted Answer

To prevent moisture from wicking upward through the concrete into the wood framing

Answer

To provide a flexible joint that accommodates thermal expansion of the sill plate

Answer

To create a structural separation that allows differential settlement

Answer

To serve as a sound-dampening layer between the concrete and framing

Question 6

Which condition most urgently indicates an active foundation drainage failure requiring immediate remediation?

Accepted Answer

Active water flowing through cracks in the foundation wall during rain events

Answer

White mineral deposits (efflorescence) on dry interior basement walls

Answer

Old water stains visible on interior walls well above the floor

Answer

Hairline shrinkage cracks in an interior concrete floor slab

Question 7

What is the primary structural reason for installing steel reinforcing bars (rebar) in residential concrete foundation walls and footings?

Accepted Answer

To increase the tensile strength of concrete, which is weak in tension, preventing cracking under load

Answer

To reduce concrete shrinkage during the curing process

Answer

To improve the moisture resistance of the finished concrete

Answer

To reduce the volume of cement paste required in the mix design