In the State of Michigan, every building is classified into one of five construction types, as defined in the Michigan Building Code (adapted from the International Building Code – IBC). These classifications are critical for determining how buildings are constructed and how well they resist fire. They also influence the permitted height, area, and occupancy type of the structure.

This article explores the five types of construction used in Michigan, focusing on the combustibility of materials and the fire-resistance ratings of key structural elements, such as the frame, floor, roof, and walls.

Natural light and ventilation are critical components of healthy and livable residential spaces. To ensure adequate daylight and airflow, the Michigan Residential Code (MRC) sets minimum standards for the size of windows in habitable rooms. These requirements are defined through window-to-room area ratios, primarily found in Section R303 of the MRC.

Energy efficiency is a growing concern among homeowners, especially as energy costs rise and environmental awareness increases. A significant factor that impacts a home’s energy efficiency is air leakage, which contributes to unwanted heat loss in winter and heat gain in summer. Understanding where the most air leakage and energy loss occur in a typical residential house is the first step toward improving comfort, reducing utility bills, and enhancing overall energy performance.