NHIE Fireplaces, Chimneys and Solid-Fuel Burning Appliances

Question 1

Under the common 3-2-10 rule, how high must a masonry chimney extend?

Accepted Answer

At least 3 feet above the roof penetration and 2 feet higher than any part of the building within 10 feet

Answer

The IRC 3-2-10 rule says a chimney must extend at least 3 feet above the point where it passes through the roof. It must also be at least 2 feet higher than any part of the building within 10 feet horizontally. This gives proper draft and keeps sparks away from the roof.

Question 2

A masonry fireplace has an opening of less than 6 square feet. What is the minimum hearth extension in front of the opening?

Accepted Answer

16 inches

Answer

For openings under 6 square feet, the hearth extension must reach at least 16 inches in front of the opening and 8 inches past each side. For openings of 6 square feet or more, it must reach 20 inches in front and 12 inches past each side.

Question 3

What is the minimum air-space clearance between combustible framing and a masonry chimney located entirely inside the house?

Accepted Answer

2 inches

Answer

The IRC requires 2 inches of clearance between combustibles and masonry chimneys located inside the building. Chimneys on the exterior of the building need only 1 inch. Framing that touches the masonry is a fire hazard and should be reported.

Question 4

When is a cricket (saddle) required on the uphill side of a chimney?

Accepted Answer

When the chimney is wider than 30 inches measured perpendicular to the roof slope

Answer

The IRC requires a cricket when the chimney is more than 30 inches wide parallel to the ridge, that is, across the slope. The cricket sends water around the chimney so it doesn't pond behind it and leak through the flashing.

Question 5

During an inspection you see the brick faces flaking and breaking off near the top of a masonry chimney. What is the most likely cause?

Accepted Answer

Water getting into the masonry followed by freeze-thaw cycles (spalling)

Answer

Spalling happens when water soaks into brick or mortar, freezes, and expands, breaking off the surface. A missing or damaged chimney cap or crown, or poor flashing, is often the source of the water. It should be reported and repair recommended.

(NHIE) National Home Inspector Examination Practice Test

(NHIE) National Home Inspector Examination Practice Test

NHIE Fireplaces, Chimneys and Solid-Fuel Burning Appliances