Gypsum Board Roof Decking

All gypsum board end joints should occur.

Gypsum board roof decking.

The gypsum roof deck system is supported by bulb tees generally spaced from 24 to 32 on center. Click on an image to enlarge. Tested in accordance with astm e84 its surface burning characteristics are flame spread 0 and smoke developed 0. This system provides fire resistance seismic and wind load diaphragm values in addition to an economical roofing membrane substrate.

Densdeck roof boards are fm tested and approved as the only 1 2 gypsum product to meet the calorimeter requirements for conventionally insulated decks. Gypsum or lightweight concrete deck. 5 8 15 9 mm gypsum board underlayment roof covering combustible panel sheathing felt install 5 8 in. Keydeck woven wire mesh is commonly used in repair of poured gypsum roof decks.

Gypsum concrete roof deck system. Introduced as a roof deck substrate in the 1940 s. Apply the gypsum board perpendicular to and on top of roof trusses or rafters prior to the installation of combus tible roof sheathing. 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.

Examples of gypsum roof decks. 15 9 mm type x gypsum board over the en tire roof area. Old bald asphalt roof over wet fiberboard over asphalt felts and the white. 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.

These include office complexes schools public buildings shopping malls and warehouses located throughout the united states. 5 8 densdeck roof boards can replace any generic type x gypsum board in. Gypsum deck from underneath. 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.

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. Gypsum or lightweight concrete deck. 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.

The bulb tees which are very strong vertically but quite flexible horizontally provide the long span strength. Gypsum or lightweight concrete deck. The top of the metal banded material will look like white sheet rock.