Which type of door construction includes wood filler pieces for added strength and may be fire-rated?

The type of door construction that includes wood filler pieces for added strength and may be fire-rated is solid core. Solid core doors are manufactured with a solid core material, which is typically made of wood or a composite material, and includes wood filler inserts. This construction method provides enhanced durability and strength, making these doors suitable for high-traffic areas and applications where fire resistance is needed.

Solid core doors can be designed to meet specific fire rating standards, thus providing added protection against the spread of fire and smoke. They are often used in commercial buildings, institutional settings, and residential environments where both security and fire safety are priorities. This combination of structural integrity and fire resistance sets solid core doors apart from other types of door constructions, allowing for both robust performance and compliance with building safety codes.

In contrast, hollow core doors typically lack solid filler materials, making them lighter but less robust, while flush doors are generally flat and do not have the structural reinforcement found in solid core models. Panel doors feature a more decorative design with multiple raised or recessed panels and may not necessarily offer the same level of strength as solid core doors.