Abstract: A building deck structure having sheet metal structural shapes of a box section as sub-purlins, the upper face of the box section having open slots for engaging sheet metal clips which are secured in the box section when the axis of the clip and the box section are about 90.degree. to each other, the clip engaging and holding a formboard-insulation assembly adjacent the top face of the box section and providing a bearing surface for deck supporting shapes for attachment of sheet polymeric structural weather surface to provide uplift resistance to the composite structure. The deck structure of this invention is extremely versatile providing a very economical insulating deck structure which is particularly suited to solar energy absorption and skylights over large areas. The combination structure of this invention permits the use of thinner formboard and lightweight plastic structural weather surface, providing lighter weight insulated and solar energy absorbing decks than previously available.

Abstract: A sheet metal structural shape for use as a purlin or sub-purlin in deck construction which is symmetrical about a vertical bisecting plane having a central vertical web, two legs projecting downwardly from the bottom of said web at an angle of about 45.degree. to about 75.degree. to the horizontal, each leg having a substantially horizontal flange projecting outwardly at its lower extremity, and a stiffening member at the upper edge of the web. Poured concrete insulated deck structures utilizing a series of the metal structural shapes with gypsum formboard resting on the horizontal flanges and extending between adjacent structural shapes, rigid synthetic polymer foam having an underside adjacent the upper side of the gypsum formboard and having holes vertically therethrough, the holes having an area of more than about 5 percent of the area of the underside of the foam, and poured concrete adjacent the upper side of the foam and around the stiffener to prevent uplift.

Abstract: A fireproof insulated roofing sandwich type assembly having incombustible rigid gypsum formboard beneath and toward the interior of a building from a layer of synthetic polymer foam placed above to the exterior of the building from the rigid formboard and a waterproof wearing surface to the exterior of the synthetic polymer foam. The roofing assemblies of this invention provide Class 1 and hourly fire ratings to precast wood fiber cement-bonded boards. The roofing assembly of this invention is also suitable for installation over steel roof decks.

Abstract: An insulated decking structure and method using a sheet metal structural shape as a purlin or sub-purlin which is symmetrical about a vertical bisecting plane and having a central vertical web, two legs projecting downwardly from the bottom of said web at an angle of about 45.degree. to 75.degree. to the horizontal, each leg having a substantially horizontal flange projecting outwardly at its lower extremity, and a stiffening member at the upper edge of the web.