Roof system

Claim 2

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of purlins each including an upwardly extending central web, said purlins being mounted in spaced parallel relationship with respect to one another on said rafters, the improvement therein of the upwardly extending central webs of said purlins defining a plurality of openings at various heights therein with the openings of the purlins being in approximate alignment with the openings of the purlins or opposite sides thereof, and a plurality of insulation support straps oriented parallel to one another and perpendicular to said purlines and extending through aligned ones of said openings of said purlins, elongated strips of insulation material of a width approximately equal to the spacing between the central webs of said purlins positioned between the extending parallel to said purlins and resting on said support straps, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material.

Claim 3

The roof structure of claim 1 and further including a plurality of secondary insulation support straps extending across and over said support straps and parallel to said purlins whereby said secondary insulation support straps are supported by said insulation support straps.

Claim 4

The roof structure of claim 1 and wherein said elongated strips of insulation material positioned between said purlins comprises a lower layer of insulation material with a bottom surface comprising a vapor impermeable substance, and an upper layer of insulation material of greater thickness than said lower layer resting on said lower layer.

Claim 5

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including as upwardly extending central web and at least one laterally extending lower flange, the improvement therein of the upwardly extending central webs of said purlins defining openings therein with at least one flat surface, a plurality of support straps oriented parallel to one another and perpendicular to said purlins and extending through said openings, means for urging said straps into engagement with the flat surface of said openings, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material.

Claim 6

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including as upwardly extending central web and at least one laterally extending lower flange, the improvement therein of the upwardly extending central webs of said purlins defining openings therein with at least one flat surface, a plurality of support straps oriented parallel to one another and perpendicular to said purlins and extending through said openings, means for urging said straps into engagement with the flat surface of said openings, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material.

Claim 7

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including an upwardly extending central web and laterally extending upper and lower flanges, the improvement therein of each of said purlins defining a series of openings along its length through its central web with the openings of the purlins being in approximate alignment with the openings of the purlins on opposite sides thereof and including at least one flat surface, a plurality of support straps oriented parallel to one another and extending through the openings of the central webs of said purlins, means for urging the support straps into engagement with the flat surfaces of said openings, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material, said strips of insulation material being of a thickness approximately equal to the height of the space between said support straps and said sheets of roofing material and substantially filling the space between said support straps and said sheets of roofing material.

Claim 8

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including an upwardly extending central web and laterally extending upper and lower flanges, the improvement therein of each of said purlins defining a series of openings along its length through its central web with the openings of the purlins being in approximate alignment with the openings of the purlins on opposite sides thereof and including at least one flat surface, a plurality of support straps oriented parallel to one another and extending through the openings of the central webs of said purlins, means for urging the support straps into engagement with the flat surfaces of said openings, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material, said strips of insulation material being of a thickness approximately equal to the height of the space between said support straps and said sheets of roofing material and substantially filling the space between said support straps and said sheets of roofing material.

Claim 9

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including an upwardly extending central web and at least one laterally extending lower flange, the improvement therein of the upwardly extending central webs of said purlins defining openings therein and a plurality of support straps oriented parallel to one another and perpendicular to said purlins and extending through said openings, fasteners connecting the support straps to the central webs at the openings of said central webs, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material.

Claim 10

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including an upwardly extending central web and at least one laterally extending lower flange, the improvement therein of the upwardly extending central webs of said purlins defining openings therein and a plurality of support straps oriented parallel to one another and perpendicular to said purlins and extending through said openings, fasteners connecting the support straps to the central webs at the openings of said central webs, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material.

Claim 11

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including an upwardly extending central web and oppositely laterally extending upper and lower flanges, the improvement therein of each of said purlins defining groups of openings equally spaced along the length of the purlin through its central web with the openings of the purlins being in approximate alignment with the openings of the purlins on opposite sides thereof, a plurality of support straps oriented parallel to one another and extending through an opening of each group of openings of the central webs of said purlins, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material, said strips of insulation material being of a thickness approximately equal to the height of the space between said support straps and said sheets of roofing material and substantially filling the space between said support straps and said sheets of roofing material.

Claim 12

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including an upwardly extending central web and oppositely laterally extending upper and lower flanges, the improvement therein of each of said purlins defining groups of openings equally spaced along the length of the purlin through its central web with the openings of the purlins being in approximate alignment with the openings of the purlins on opposite sides thereof, a plurality of support straps oriented parallel to one another and extending through an opening of each group of openings of the central webs of said purlins, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material, said strips of insulation material being of a thickness approximately equal to the height of the space between said support straps and said sheets of roofing material and substantially filling the space between said support straps and said sheets of roofing material.

Claim 13

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including an upwardly extending central web and laterally extending upper and lower flanges, the improvement therein of each of said purlins defining groups of openings through its central web, said groups of openings being spaced along the length of the purlins with the openings of each group being variably spaced from the flanges of the purlins with the openings of the purlins being in approximate alignment with the openings of the purlins of opposite sides thereof, a plurality of support straps oriented parallel to one another and extending through the openings of the central webs of said purlins, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material, said strips of insulation material being of a thickness approximately equal to the height of the space between said support straps and said sheets of roofing material and substantially filling the space between said support straps and said sheets of roofing material.

Claim 14

In a roof structure comprising a plurality of spaced rafters oriented parallel to one another, a plurality of approximately equally spaced purlins mounted on said rafters and oriented parallel to one another and perpendicular to said rafters, each of said purlins including an upwardly extending central web and laterally extending upper and lower flanges, the improvement therein of each of said purlins defining groups of openings through its central web, said groups of openings being spaced along the length of the purlins with the openings of each group being variably spaced from the flanges of the purlins with the openings of the purlins being in approximate alignment with the openings of the purlins of opposite sides thereof, a plurality of support straps oriented parallel to one another and extending through the openings of the central webs of said purlins, elongated strips of insulation material of a width sufficient to substantially span the space between the central webs of adjacent ones of said purlins positioned between and extending parallel to said purlins and resting on said support straps and above the lower flanges of said purlins, and sheets of roofing material mounted on said purlins and extending over said strips of insulation material, said strips of insulation material being of a thickness approximately equal to the height of the space between said support straps and said sheets of roofing material and substantially filling the space between said support straps and said sheets of roofing material.

Claim 19

The method of claim 10 and wherein the step of placing elongated strips of insulation material on the insulation support means comprises supporting reels of elongated strips of insulation material on the purlins, and moving the reels along the purlins and paying out the insulation material from the reels down between the purlins as the reels are moved along the purlins.

Claim 20

The method of claim 10 and further including the step of placing insulation material on the upper surfaces of the purlins before the roofing material is applied to the purlins.