NEBT Northeast Bulb Tee Post-Tensioned Design Guidelines 2278kb PDF File This report covers design detailing and construction specifications for post-tensioning and splicing of the New England Bulb Tee NEBT girder. The wire mesh is laid over top of the form board and subpurlins Gypsum concrete is placed at a minimum of 2 inches above the formboard either fiberglas formboard or sheetrock formboard Various subpurlins were used in the system They include bulb tees and truss tees Both provide the spanning characteristics required for the design.
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The New England bulb Tee has been specifically designed and approved for use throughout New England.
. Provide 16 mm 58-inch minimum bearing for gypsum planks. The gypsum concrete which spans tee to tee encases the tees and prevents them from rotating or deforming horizontally when. Galvanize or factory coat sub-purlins with manufacturers standard primer.
Formboards placed between the bulb tees contain the fast-setting poured gypsum roof deck. Gypsum Roof Deck Panels. Nov 11 1975 0183 32 insulating and fireproof poured gypsum roof deck substitutes for bulb tees in roof deck one-half to abut 112 inch to accommodate.
It was produced by several manufacturers such as United States Gypsum Co Bestwall Company and Georgia-Paciic Corp. The rabbeted edges of TECTUM tile rest on the steel tee flanges of the 218 bulb-tees. Splicing of the girders allows for longer span lengths and the elimination of intermediate bridge piers.
Standard deck widths vary from 4 to 8 wide and 6 thick however there are many possibilities for. Every two feet or so you should see the bottom flange of the bulb tee running perpendicular to the open web joists. In decades past poured gypsum enjoyed a signiicant niche of the roof deck market place.
They also anchor deck against uplift forces restrict deck movement due to temp changes and provide lateral bracing for roof structure. For enhanced thermal resistance molded expanded polystyrene EPS boards may be incorporated into lightweight insulating concrete. According to present deck construction practice utilizing bulb tee or truss tee subpurlins with the concomitant spacing of 32 inches it has not been practical to provide gypsum slabs of less than 2.
Aug 12 2018 gypsum decks incorporated the placement of bulb tees generally spaced 24 to 32 inches on center a fiberglass formboard galvanized wire mesh and fast. Venting of these deck types is an important consideration. FLOOR FRAMING With a large variety of structural steel floor-framing systems available designers frequently investigate.
Bulb Tees are high strength lightweight steel sections. Bulb Tees also make excellent bond beams for anchoring structural members providing a continuous steel strip for attachment and reinforcement. Excess water not consumed during the hydration process can.
Contact Us for More. Understand the installation procedures and attributes of roof deck systems and how they improve in place insulation fire protection and acoustical performance. Decked bulb tee girders are a versatile long span girder that incorporates the benefits of both an I girder and a precast slab 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. What you see from the bottom appears to be like a drywall material. After Years of Roof Leaks a Laboratory That Produces Know More.
Been utilized in the construction industry for many decades. Provide 16 mm 58-inch minimum bearing for gypsum planks. Feb 28 2016 - 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.
In roof decks the irst widespread use of SCA was the poured gypsum roof deck on bulb tees that began over 70 years ago. We can install gypsum repair patches including USG Securock Keydeck Mesh and 218 Bulb Tees. Building deck construction Know More.
These girders are typically used for vehicle bridges and can range in length from as small as 40 up to 160. The longitudinal deck panel edge was seated atop the horizontal leg of the bulb-tee The roof decking incorporates 12-inch gypsum formboard loose. Mule-Hides PYRO XL Roof Deck Panel is designed for primary use as roof deck sheathing.
Use of gypsum roof deck. Poured gypsum concrete is typically used in conjunction with steel bulb tees formboards and galvanized reinforcing mesh Fig. We placed new bulb tees laid gypsum form panels in the bulb tees and then poured the new gypsum deck.
Chicken wire is draped over the bulb of the bulb tee then the gypsum concrete is poured over the top. It has a gypsum form board on the bottom sitting on the flange of a bulb tee. Gypsum concrete roof decks are lightweight set rapidly 30minutes and.
Next came lightweight insulating concrete LWIC over galvanized form deck which fol-lowed some years. Drainage slopes can be readily built into the roof deck by varying the thickness of gypsum. New England Bulb Tees OSCO Construction Group.
The gypsum roof deck system is supported by bulb tees. TECTUM Roof Deck Tile is used with 218 bulb-tee steel subpurlins to increase the span and diaphragm capacity of the deck. Open web truss-tees hot-rolled bulb-tees or folded sheet metal tees as required by design loads spans and fire ratings.
This was a common deck type in. When used on low-slope applications this is an excellent substrate for an. Some types may also be cast atop concrete decks.
The bulb tees which are very strong vertically but quite flexible horizontally provide the long span strength. In addition to providing systems for new construction we can help our clients with gypsum repair for roof deck systems. Special galvanized wire mesh draped over the bulb tees distribute vertical loads to the bulb tee system and resist diaphragm loads.
The clear long spans along with life cycle costing. Open web truss-tees hot-rolled bulb-tees or folded sheet metal tees as required by design loads spans and fire ratings. The gypsum roof deck system is supported by bulb tees generally spaced from 24 to 32 on center.
For this system to get price. Lightweight insulating concrete may be cast over steel decks or bulb-tee and formboard systems. Nov 17 2014 - Gypsum concrete construction -Bulb tees are used as structural sub purlin.
Gypsum concrete Wire Mesh Formboard Bulb or Truss Tee History Gypsum cast over formboards and structurally supported by bulb tees or truss tees was introduced as a roof deck substrate in the 1940s. USG Securock Gypsum-Concrete Patch The USG Securock Gypsum-Concrete Patch is mill formulated and composed of specially calcined gypsum and wood chips or. This system provides fire resistance seismic and wind load diaphragm values in addition to an economical roofing membrane substrate.
DensDeck Roof Boards can replace any generic type X gypsum board in any roof assembly in the UL Fire Resistance Directory under the prefix. The space between the tile and bulb-tees are filled with gypsum grout for excellent anchorage and wind uplift resistance. These girders are designed with a universal form configuration available in 5 sizes depending on the loads spans required and site conditions.
DensDeck Roof Boards can replace any generic type X gypsum board. Many of the benefits of these girders come from the versatility of the deck. Galvanize or factory coat sub-purlins with manufacturers standard primer.
They are fastened to primary framing and provide support for form boards that receive gypsum concrete.
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