Insulated roof diaphragms and methods

A method of installing a roof system, the method comprising:

• positioning a roof diaphragm adjacent a roof frame so that the roof diaphragm extends at an angle of inclination equal to or greater than 10 degrees from horizontal, the roof diaphragm comprising a nail board and an insulating panel bonded to the nail board so that respective surfaces of the insulating panel and the nail board mate against one another across the nail board, the insulating panel comprising a foam core and a facer bonded to, and covering, a side of the foam core opposite the nail board;
• connecting the roof diaphragm to the roof frame, comprising driving each of a plurality of nail board fasteners through the nail board, through the insulating panel, and into the roof frame to a depth so that:
• the roof diaphragm is positioned adjacent, and connected to, the roof frame;
• the insulating panel is positioned between the nail board and the roof frame;
• the insulating panel engages the roof frame;
• and
• the roof diaphragm and the roof frame at least partially define an attic space;
• installing a protective layer of sheeting over the roof diaphragm;
• and
• installing a roof cover over the protective layer of sheeting and the roof diaphragm with a plurality of roofing fasteners;
• wherein the roof cover, the protective layer of sheeting, and the roof diaphragm are configured so that the roofing fasteners extend through the roof cover, the protective layer of sheeting, and the nail board, and into the insulating panel;
• wherein the insulating panel, including the foam core and the facer, acts as a thermal envelope resisting heat transfer through the roof diaphragm;
• wherein the facer acts as a radiant barrier;
• wherein the roof frame comprises first and second roof structural members into which respective ones of the nail board fasteners extend;
• wherein the insulating panel is positioned between the nail board and each of the first and second roof structural members so that:
• the facer is engaged with each of the first and second roof structural members along a plane;
• a portion of the facer extends between the first and second roof structural members;
• the portion of the facer is exposed to the attic space and is thus visible within the attic space;
• and
• the nail board does not engage either the first roof structural member or the second roof structural member;
• wherein the plane along which the facer engages each of the first and second roof structural members extends at the angle of inclination;
• wherein the portion of the facer extending between the first and second roof structural members and exposed to the attic space extends at the angle of inclination;
• and
• wherein:
• the nail board defines a first length and a first width;
• the insulating panel defines a second length and a second width;
• the first length is less than the second length;
• and
• the first width is less than the second width.

A roof system, comprising:

• a roof frame;
• a roof diaphragm connected to the roof frame and extending at an angle of inclination equal to or greater than 10 degrees from horizontal, the roof diaphragm comprising:
• a nail board;
• and
• an insulating panel bonded to the nail board so that respective surfaces of the insulating panel and the nail board mate against one another across the nail board;
• wherein the insulating panel includes a foam core;
• wherein the roof diaphragm defines opposing first and second outside surfaces spaced in a parallel relation;
• and
• wherein the nail board defines the first outside surface of the roof diaphragm;
• a plurality of nail board fasteners connecting the roof diaphragm to the roof frame, the nail board fasteners each extending through the nail board, through the insulating panel, and into the roof frame to a depth;
• an attic space at least partially defined by the roof frame and the roof diaphragm;
• and
• a roof cover installed over the roof diaphragm with a plurality of roofing fasteners;
• wherein the roof cover and the roof diaphragm are configured so that the roofing fasteners extend through the roof cover and the nail board, and into the insulating panel;
• wherein the roof frame comprises first and second roof structural members into which respective ones of the nail board fasteners extend;
• wherein the insulating panel is positioned between the nail board and each of the first and second roof structural members so that:
• respective first and second portions of the second outside surface are engaged with the first and second roof structural members along a plane;
• a third portion of the second outside surface extends between the first and second roof structural members;
• the third portion of the second outside surface is exposed to the attic space and is thus visible within the attic space;
• and
• the nail board does not engage either the first roof structural member or the second roof structural member;
• wherein the plane along which the respective first and second portions of the second outside surface of the roof diaphragm engage the first and second roof structural members extends at the angle of inclination;
• wherein the third portion of the second outside surface of the roof diaphragm extending between the first and second roof structural members and exposed to the attic space extends at the angle of inclination;
• wherein the second outside surface of the roof diaphragm is defined by the foam core;
• wherein each of the first and second roof structural members is engaged with the foam core along the plane;
• and
• wherein the third portion of the second outside surface of the roof diaphragm, which extends between the first and second roof structural members and is exposed to the attic space and is thus visible within the attic space, is defined by the foam core.

A method of installing a roof system, the method comprising:

• positioning a roof diaphragm adjacent a roof frame so that the roof diaphragm extends at an angle of inclination equal to or greater than 10 degrees from horizontal, the roof diaphragm comprising a nail board and an insulating panel bonded to the nail board so that respective surfaces of the insulating panel and the nail board mate against one another across the nail board, wherein the insulating panel includes a foam core;
• wherein the roof diaphragm defines opposing first and second outside surfaces spaced in a parallel relation;
• and
• wherein the nail board defines the first outside surface of the roof diaphragm;
• connecting the roof diaphragm to the roof frame, comprising driving each of a plurality of nail board fasteners through the nail board, through the insulating panel, and into the roof frame to a depth so that:
• the roof diaphragm is positioned adjacent, and connected to, the roof frame;
• and
• the roof diaphragm and the roof frame at least partially define an attic space;
• and
• installing a roof cover over the roof diaphragm with a plurality of roofing fasteners, the roof cover and the roof diaphragm being configured so that the roofing fasteners extend through the roof cover and the nail board, and into the insulating panel;
• wherein the roof frame comprises first and second roof structural members into which respective ones of the nail board fasteners extend;
• wherein the insulating panel is positioned between the nail board and each of the first and second roof structural members so that:
• respective first and second portions of the second outside surface are engaged with the first and second roof structural members along a plane;
• a third portion of the second outside surface extends between the first and second roof structural members;
• the third portion of the second outside surface is exposed to the attic space and is thus visible within the attic space;
• and
• the nail board does not engage either the first roof structural member or the second roof structural member;
• wherein the plane along which the respective first and second portions of the second outside surface of the roof diaphragm engage the first and second roof structural members extends at the angle of inclination;
• wherein the third portion of the second outside surface of the roof diaphragm extending between the first and second roof structural members and exposed to the attic space extends at the angle of inclination;
• wherein the second outside surface of the roof diaphragm is defined by the foam core;
• wherein each of the first and second roof structural members is engaged with the foam core along the plane;
• and
• wherein the third portion of the second outside surface of the roof diaphragm, which extends between the first and second roof structural members and is exposed to the attic space and is thus visible within the attic space, is defined by the foam core.