What type of material is typically used for the door between an attached garage and a dwelling unit?

The typical choice for the door between an attached garage and a dwelling unit is solid wood. This type of door provides several advantages, including good insulation properties and resistance to fire. In many building codes, there are specific requirements for fire-rated doors in these locations to help prevent the spread of fire from an attached garage to the living space. Solid wood doors can meet these fire resistance standards effectively.

While steel and hollow metal doors are also options for their strength and durability, they may not provide the same level of insulation and aesthetic appeal that a solid wood door can offer in residential settings. Fiberglass doors, although lightweight and resistant to moisture and warping, may not typically be specified for this critical boundary where fire safety is a concern. Thus, solid wood doors represent the standard choice due to their balance of safety, insulation, and aesthetics for this particular application.