A pre-assembled floor and ceiling panel for use in a building, the panel comprising: a plurality of joists; a corrugated form deck disposed above and attached to the plurality of joists; a ceiling substrate disposed below and attached to the plurality of joists; and an in-floor radiant heat member disposed between the corrugated form deck and the ceiling substrate, characterized in that: one or more joists of the plurality of joists define a plurality of apertures (564, 566) that extend transversely through the one or more joists; the in-floor radiant heat member extends transversely through one or more apertures of the plurality of apertures of the one or more joists, and wherein the in-floor radiant heat member extends transversely through an aperture of the plurality of apertures that is formed in an outer joist so as to extend in use into an adjacent floor and ceiling panel; the plurality of apertures (564, 566) includes a first set of apertures aligned along a centerline of the joists and spaced along a length of the joists; the plurality of apertures (564, 566) includes a second set of apertures offset from a centerline of the joists and spaced along the length of the joists between adjacent apertures of the first set of apertures; the first set of apertures includes oval-shaped apertures; the second set of apertures includes circular-shaped apertures; the first set of apertures is larger in size than the second set of apertures; and the in-floor radiant heat member extends through an aperture of the second set of apertures that is spaced from an underside of the corrugated form deck by less than one-third of a height of the joist, and the dimension of the aperture matches a dimension of the radiant heat member. a plurality of joists; a corrugated form deck disposed above and attached to the plurality of joists; a ceiling substrate disposed below and attached to the plurality of joists; and an in-floor radiant heat member disposed between the corrugated form deck and the ceiling substrate, characterized in that: one or more joists of the plurality of joists define a plurality of apertures (564, 566) that extend transversely through the one or more joists; the in-floor radiant heat member extends transversely through one or more apertures of the plurality of apertures of the one or more joists, and wherein the in-floor radiant heat member extends transversely through an aperture of the plurality of apertures that is formed in an outer joist so as to extend in use into an adjacent floor and ceiling panel; the plurality of apertures (564, 566) includes a first set of apertures aligned along a centerline of the joists and spaced along a length of the joists; the plurality of apertures (564, 566) includes a second set of apertures offset from a centerline of the joists and spaced along the length of the joists between adjacent apertures of the first set of apertures; the first set of apertures includes oval-shaped apertures; the second set of apertures includes circular-shaped apertures; the first set of apertures is larger in size than the second set of apertures; and the in-floor radiant heat member extends through an aperture of the second set of apertures that is spaced from an underside of the corrugated form deck by less than one-third of a height of the joist, and the dimension of the aperture matches a dimension of the radiant heat member. one or more joists of the plurality of joists define a plurality of apertures (564, 566) that extend transversely through the one or more joists; the in-floor radiant heat member extends transversely through one or more apertures of the plurality of apertures of the one or more joists, and wherein the in-floor radiant heat member extends transversely through an aperture of the plurality of apertures that is formed in an outer joist so as to extend in use into an adjacent floor and ceiling panel; the plurality of apertures (564, 566) includes a first set of apertures aligned along a centerline of the joists and spaced along a length of the joists; the plurality of apertures (564, 566) includes a second set of apertures offset from a centerline of the joists and spaced along the length of the joists between adjacent apertures of the first set of apertures; the first set of apertures includes oval-shaped apertures; the second set of apertures includes circular-shaped apertures; the first set of apertures is larger in size than the second set of apertures; and the in-floor radiant heat member extends through an aperture of the second set of apertures that is spaced from an underside of the corrugated form deck by less than one-third of a height of the joist, and the dimension of the aperture matches a dimension of the radiant heat member.