Gypsum Board Roof Decking

Gypsum or lightweight concrete deck.

Gypsum board roof decking.

These include office complexes schools public buildings shopping malls and warehouses located throughout the united states. Gypsum concrete roof deck system. The gypsum roof deck system is supported by bulb tees generally spaced from 24 to 32 on center. 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.

This system provides fire resistance seismic and wind load diaphragm values in addition to an economical roofing membrane substrate. Gypsum deck from underneath. 5 8 densdeck roof boards can replace any generic type x gypsum board in. 5 8 15 9 mm gypsum board underlayment roof covering combustible panel sheathing felt install 5 8 in.

Apply the gypsum board perpendicular to and on top of roof trusses or rafters prior to the installation of combus tible roof sheathing. Gypsum or lightweight concrete deck. Keydeck mesh is made up of 2 hexagonal mesh composed of woven 19 gauge galvanized wires with an additional 16 gauge galvanized longitudinal wire placed at every 3 interval of its width. Formboards placed between the bulb tees contain the fast.

Shown to withstand delamination deterioration warping and job site damage far more effectively than paper faced gypsum board and other conventional roofing products such as wood fiberboard and perlite certified by ul for use as a fire barrier over combustible and noncombustible decks in accordance with the ansi ul 790 and ulc s114 test standard. Click on an image to enlarge. Bulb tees are high strength lightweight steel sections. 15 9 mm type x gypsum board over the en tire roof area.

Keydeck woven wire mesh is commonly used in repair of poured gypsum roof decks. Densdeck roof boards are fm tested and approved as the only 1 2 gypsum product to meet the calorimeter requirements for conventionally insulated decks. Introduced as a roof deck substrate in the 1940 s. Securock brand gypsum fiber roof board s dense concentration of gypsum and cellulose fibers provides exceptional panel and bond strength low surface absorption and superior wind uplift performance with no face layer to delaminate.

The bulb tees which are very strong vertically but quite flexible horizontally provide the long span strength. Gypsum concrete roof deck systems have been installed since the early 1950 s in all types of commercial markets. The gypsum concrete which spans tee to tee encases the tees and. Examples of gypsum roof decks.

Old bald asphalt roof over wet fiberboard over asphalt felts and the white. All gypsum board end joints should occur. The sustainable design has earned independent certification from scientific certification systems.