Gypsum Roof Deck Bulb Tee

Special galvanized wire mesh draped over the bulb tees distribute vertical loads to the bulb tee system and resist diaphragm loads.

Gypsum roof deck bulb tee. Gypsum concrete is placed at a minimum of 2 inches above the formboard either fiberglas formboard or sheetrock formboard. Various sub purlins were used in the system. For this system to properly perform it is critical that. Place plank on lower flanges of sub purlins or other framing with ends and edges supported.

Formboards placed between the bulb tees contain the fast setting poured gypsum roof deck. Use minimum 13 mm 1 2 inch fillet welds on alternate sides of sub purlins both sides at end joints to main purlins. They include bulb tees and truss tees. Bulb tees are high strength lightweight steel sections used as structural subpurlins in specialty roof decks such as tectum wood plank poured gypsum decks and span rock gypsum plank decks.

The results of a study of the structural action of a gypsum slab with steel bulb tee subpurlins and steel bar joist purlins in poured in place gypsum concrete roof decks are presented. Present 1966 practice is to design these decks on the assumption that only the steel is effective in supporting the loads to which these decks are subjected. Bulb tees are high strength lightweight steel sections for use as structural subpurlins in specialty roof decks such as tectum wood fiber decks poured gypsum decks and span rock gypsum plank decks. Bulb tees of several shapes and sizes were used depending on the loading conditions under design as well as the span of the tees.

Bulb tees also make excellent bond beam for anchoring structural members providing a continuous strip for attachment and reinforcement. Formboards placed between the bulb tees contain the fast setting poured gypsum roof deck. The gypsum concrete which spans tee to tee encases the tees and prevents them from rotating or deforming horizontally when under load thus creating the structural composite strength. The gypsum roof deck system is supported by bulb tees generally spaced from 24 to 32 on center.

Gypsum deck plank for roof decks. Special galvanized wire mesh draped over the bulb tees distribute vertical loads to the bulb tee system and resist diaphragm loads. However when gypsum decks entered the marketplace roof decks were not used as the normal method of providing diaphragm shear resistance to the building in many parts of the country. Both provide the spanning characteristics required for the design.

The gypsum roof deck system is supported by bulb tees generally spaced from 24 to 32 on center.