Gypsum Roof Deck Thickness

Local building code will require a minimum thickness or type of gypsum wallboard in some situations.

Gypsum roof deck thickness.

Special galvanized wire mesh draped over the bulb tees distribute vertical loads to the bulb tee system and resist diaphragm loads. For thicker boards like securock 1 2 gypsum fiber two scores will be necessary. Edge encased in water resistant paper. For 5 8 securock gypsum fiber a tool such as a circular saw will be necessary.

The gypsum roof deck system is supported by bulb tees generally spaced from 24 to 32 on center. No securock roof boards will cut with ordinary utility knifes using a score an snap method. According to fields corp the compressive strength of the gypsum is 500 psi. Factory laminate from two 25 mm 1 inch thick gypsum panels with top panel edge set back along sub purlin edge not more than 13 mm 1 2 inch.

Densdeck roof boards are easy to. Densdeck roof boards are fm tested and approved as the only 1 2 gypsum product to meet the calorimeter requirements for conventionally insulated decks. I have generally seen the tees spaced about 30 to 36 on center. Each plank weighs approximately 135 lbs.

The poured gypsum roof deck consists of steel bulb tees a form board usually composed of gypsum or fiberglass wire reinforcing mesh and the gypsum concrete. Typcally the poured gypsum deck is about 2 to 3 thick not 1 2 as you previously mentioned and is supported by bulb tees. Gypsum concrete roof deck systems consist of a form board wire. Thickness of a steel roof deck can be determined at a roof hatch where the edge of the deck may be available for measurement with a micrometer.

2 1 gypsum plank roof decking figure 1 2 1 1 gypsum planks are normally 2 inches thick 2 feet wide and 8 feet long and are factory laminated of two gypsum panels. The fiberglass mat faced noncombustible as described and tested in accordance with astm e136 nonstructural gypsum core panels provide superior fire resistance and protection from hail damage and hold up well under normal construction and maintenance foot traffic while stiffening and stabilizing roof decks. Astm c1396 type x 16 mm 5 8 inch thick by 600 mm 24 inches wide by main purlin span. Gypsum wallboard also called drywall is much quicker to install than plaster and the finished effect is a smoother wall.

Formboards placed between the bulb tees contain the fast setting poured gypsum roof deck. Flexural strength can be assumed to be 33ksi unless a new single ply system is contemplated that requires a higher pull out strength. Note gypsum planks also come in other sizes. Tested in accordance with astm e84 its surface burning characteristics are flame spread 0 and smoke developed 0.