A
fire retardant panel door and door frame that prevents the spread of fire through the door during a fire. The
fire retardant panel door has at least one door panel and stiles and rails. The door panel includes an interior center composite section formed by a first plurality of
layers of
intumescent materials and a first plurality of
layers of fire resistant materials disposed between and laminated to a pair of outer sections formed of wood for enclosing the interior center composite section to form a composite laminated door panel. Each of the stiles includes a first center core formed of wood enclosed by a second plurality of
layers of
intumescent materials and a second plurality of layers of fire resistant materials; and the second layers of
intumescent and fire resistant materials are enclosed by a first applique layer formed of wood to form a composite laminated
stile. Each of the rails includes a second center core formed of wood enclosed by a third plurality of layers of intumescent materials and a third plurality of layers of fire resistant materials; and the third layers of intumescent and fire resistant materials are enclosed by a second applique layer formed of wood to form a composite laminated rail. The first, second, and third plurality of layers of intumescent materials are activated to expand upon
exposure to heat and / or fire to prevent the heat and / or fire from passing through at least one door panel, the stiles and the rails of the panel door during a fire for at least 90 minutes. At least one door panel is connected to the panel door by
tongue and groove joints; and the
tongue and groove joints have a fourth plurality of layers of intumescent materials and a fourth plurality of layers of fire resistant materials in the
tongue and groove joints; and wherein the fourth plurality of layers of fire resistant materials in the tongue and groove joints are activated to expand upon
exposure to heat and / or fire to seal the joints in order to prevent the heat and / or fire from passing through the panel door during a fire for at least 90 minutes.