MHIC Building Codes and Standards 2

Question 1

Under the International Residential Code (IRC), what is the minimum required ceiling height for habitable rooms in a dwelling?

Accepted Answer

7 feet

Answer

The IRC requires a minimum ceiling height of 7 feet (84 inches) for habitable rooms. While many builders choose 8 or 9 feet for comfort, the code minimum is 7 feet.

Question 2

A homeowner wants to add a bedroom in their basement. Which of the following is a code requirement that specifically applies to basement sleeping rooms but NOT necessarily to other basement rooms?

Accepted Answer

Egress window with minimum net clear opening

Answer

Sleeping rooms (bedrooms) in basements require an egress window with a minimum net clear opening of 5.7 square feet (or 5.0 sq ft at grade level), a minimum opening height of 24 inches, and minimum opening width of 20 inches. This egress requirement is specific to sleeping rooms to allow escape in emergencies.

Question 3

When inspecting a deck attached to a house, which of the following fastener requirements is specified by the IRC to prevent deck ledger failures?

Accepted Answer

Ledger bolts must be staggered in two rows with specific spacing per the IRC ledger bolt table

Answer

The IRC requires deck ledger bolts (typically 1/2-inch lag screws or through-bolts) to be staggered in two rows with spacing determined by the IRC ledger connection table based on joist span and on-center spacing. This prevents the deck from pulling away from the house, which is a common cause of deck collapses.

Question 4

Under Maryland's MHIC regulations and applicable building codes, which type of work on a residential property ALWAYS requires a permit regardless of the project cost?

Accepted Answer

Replacing a water heater

Answer

Water heater replacement always requires a permit because it involves a fuel-burning appliance or electrical connection, plumbing connections, and safety considerations such as proper venting, pressure relief valve installation, and seismic strapping (where applicable). Painting, carpet installation, and door hardware replacement are typically cosmetic and do not require permits.

Question 5

According to the IRC stairway requirements, what is the maximum allowable rise (vertical height) for a single step in an interior staircase?

Accepted Answer

7¾ inches

Answer

The IRC specifies a maximum riser height of 7¾ inches for interior staircases. Additionally, the minimum tread depth is 10 inches. These dimensions are set to reduce the risk of falls on stairs, which are a leading cause of home injuries.

(MHIC) Maryland Home Improvement Contractor Practice Test

(MHIC) Maryland Home Improvement Contractor Practice Test

MHIC Building Codes and Standards 2