What type of door should be placed between an attached garage and a dwelling unit?

A solid wood door is the appropriate choice for placement between an attached garage and a dwelling unit due to its superior fire-resistance properties. Building codes typically require that any door leading from a garage to the living space of a home be fire-rated. Solid wood doors can provide a higher level of protection against the spread of smoke and flames than other types of doors, which is crucial in mitigating fire risks.

While hollow core doors are often lighter and less expensive, they do not offer the same fire resistance and structural integrity as solid wood doors. Steel doors are another excellent option for fire safety; however, the question specifically points to solid wood as the correct answer. Fiberglass doors can be insulated and provide good energy efficiency, but they generally do not meet the same fire-resistance ratings needed for this application either. Therefore, the choice of a solid wood door aligns with safety standards and fire prevention measures critical to the design and construction of homes.