MHIC Building Codes and Standards 5

Question 1

Under the International Residential Code (IRC), what is the minimum required width for a main hallway in a new residential construction?

Accepted Answer

36 inches

Answer

The IRC requires a minimum hallway width of 36 inches for main corridors in residential construction. This ensures adequate passage space for occupants and emergency egress.

Question 2

A homeowner wants to add a bedroom in the basement. According to IRC egress requirements, what is the minimum net clear opening area required for an egress window in that bedroom?

Accepted Answer

5.7 square feet

Answer

The IRC requires egress windows to have a minimum net clear opening of 5.7 square feet (with an exception of 5.0 sq ft at grade floor). This ensures occupants can escape or be rescued in an emergency.

Question 3

When installing a deck attached to a house in Maryland, which document typically governs the ledger board connection requirements?

Accepted Answer

IRC Section R507 and local amendments

Answer

Attached deck construction, including ledger board connections, is governed by IRC Section R507 (Decks) along with any local Maryland amendments. The ledger connection is critical to prevent deck collapse and must meet specific fastener, flashing, and spacing requirements.

Question 4

A contractor is framing a load-bearing wall and needs to install a header over a 6-foot door opening. Under the IRC, what is the primary factor in determining the minimum required header size?

Accepted Answer

The load the header must carry based on span and tributary area

Answer

Header sizing is determined by the structural load the header must support, which depends on the span of the opening and the tributary area of roof, floor, or wall loads above. The IRC provides span tables that account for these loads to ensure structural adequacy.

Question 5

In Maryland, which agency is primarily responsible for adopting and enforcing the statewide building code for residential construction?

Accepted Answer

Maryland Department of Labor (through the Division of Labor and Industry)

Answer

The Maryland Department of Labor, through its Division of Labor and Industry, administers the Maryland Building Performance Standards and adopts the state building code, which is based on the IRC with Maryland-specific amendments.

(MHIC) Maryland Home Improvement Contractor Practice Test

(MHIC) Maryland Home Improvement Contractor Practice Test

MHIC Building Codes and Standards 5