CLC Foundations & Concrete Formwork

Question 1

How deep should a footing generally be placed relative to the local frost line?

Accepted Answer

Below the frost line

Answer

Footings must bear on undisturbed soil below the frost line so freezing and heaving ground does not move the foundation.

Question 2

How many cubic yards of concrete are needed for a footing 2 ft wide, 1 ft deep, and 54 ft long?

Accepted Answer

4.0 cu yd

Answer

Volume = 2 × 1 × 54 = 108 cu ft. Divide by 27 cu ft per cubic yard to get 4.0 cu yd.

Question 3

Why do wall forms need heavier ties and bracing toward the bottom?

Accepted Answer

Lateral pressure from fresh concrete increases with depth

Answer

Fresh concrete acts like a fluid, so hydrostatic pressure on the form increases with depth. Ties and walers are spaced closer toward the base to prevent blowouts.

Question 4

Under typical residential code, what is the usual maximum spacing for 1/2" anchor bolts along a sill plate?

Accepted Answer

6 ft on center

Answer

The IRC generally requires 1/2" anchor bolts at a maximum of 6 ft on center, with a bolt within 12 inches of each plate end.

Question 5

What is the main purpose of applying a form release agent before placing concrete?

Accepted Answer

To keep the concrete from bonding to the forms so they strip cleanly

Answer

A release agent prevents the concrete from sticking to the form face. This allows clean stripping, protects the surface finish, and extends the life of reusable forms.

(CLC) Certified Lead Carpenter Practice Test

(CLC) Certified Lead Carpenter Practice Test

CLC Foundations & Concrete Formwork