Massachusetts Unrestricted Construction Supervisor License Practice Test

Which statement is NOT true regarding masonry chimneys in a one or two family dwelling?

1. Chimneys may support additional loads if designed to do so

2. Must extend a minimum of 3 feet above the highest point where passing through the roof

3. Chimneys may be unlined

4. Walls must be a minimum of 4 inches in thickness

The correct answer is: Chimneys may be unlined

The statement that chimneys may be unlined is not true regarding masonry chimneys in one or two-family dwellings. Typically, masonry chimneys are required to be lined to ensure safety and efficiency in venting flue gases. The lining protects the masonry from the high temperatures and corrosive byproducts of combustion, thereby preventing damage to the chimney structure and reducing the risk of chimney fires or the potential for dangerous gas leakage into living spaces. The requirement for a liner varies depending on the type of fuel being burned and other specific building codes applicable in the jurisdiction, reinforcing the importance of proper chimney construction and design. In contrast, the other statements reflect accepted practices in building codes, such as the requirement for chimneys to support additional loads if they are engineered to do so, extending above the roof's highest point for proper ventilation, and maintaining a minimum wall thickness to ensure structural integrity.