Gypsum Roof Deck Thickness

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 roof deck thickness.

Flexural strength can be assumed to be 33ksi unless a new single ply system is contemplated that requires a higher pull out strength. Tested in accordance with astm e84 its surface burning characteristics are flame spread 0 and smoke developed 0. Local building code will require a minimum thickness or type of gypsum wallboard in some situations. The bulb tees which are very strong vertically but quite flexible horizontally provide the long span strength.

Gypsum wallboard also called drywall is much quicker to install than plaster and the finished effect is a smoother wall. 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. For thicker boards like securock 1 2 gypsum fiber two scores will be necessary. The gypsum concrete which spans tee to tee encases the tees and.

Gypsum concrete roof deck systems consist of a form board wire. 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 gypsum roof deck system is supported by bulb tees generally spaced from 24 to 32 on center. When it s not regulated industry standards will help you determine the best panel thickness for your project.

No securock roof boards will cut with ordinary utility knifes using a score an snap method. 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. For 5 8 securock gypsum fiber a tool such as a circular saw will be necessary.

Special galvanized wire mesh draped over the bulb tees distribute vertical loads to the bulb tee system and resist diaphragm loads. Astm c1396 type x 16 mm 5 8 inch thick by 600 mm 24 inches wide by main purlin span. Each plank weighs approximately 135 lbs. I have generally seen the tees spaced about 30 to 36 on center.

Formboards placed between the bulb tees contain the fast setting poured gypsum roof deck. Note gypsum planks also come in other sizes. 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. According to fields corp the compressive strength of the gypsum is 500 psi.