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GTI Slab/Beam Bolsters®

GTI Slab/Beam Bolsters®
Made in the USA

All GTI Bar Supports are 100% Made in the USA

GTI provides the strongest Slab and Beam Bolsters available in the market. They are made from composite material and meet or exceed the strength of comparable wire supports. GTI Composite Slab and Beam Bolsters have layout markings every inch to assist in laying out reinforcing and the product size is identified on product. GTI composite material offers continuous corrosion protection, both on the job-site and in concrete providing a great alternative to epoxy, stainless, and galvanized bar supports.

The GTI line of Composite Slab and Beam Bolsters contains points on the bottom of the feet that firmly hold the chair in place. GTI Composite Slab and Beam Bolsters are grey or black in color and show virtually no change in strength in temperatures ranging from 0ºF to 150ºF.

Most GTI Composite Slab and Beam Bolsters easily snap together to eliminate overlapping and the use of tie-wire, saving approximately 8% in material cost and additional labor savings. GTI Composite Slab and Beam Bolsters are available in 5 ft. lengths, and are substantially lighter than wire products, allowing field personnel to handle three to five times more quantity than metal.

1 1/4"209125215125
1 1/2"209150215150
1 3/4"209175215175
2 1/2"209250215250
3 1/2"209350215350
1 1/4"218012218125
1 1/2"218015218150
1 3/4"218017218175
2 1/4"218022218225
2 1/2"218025218250
2 3/4"218027218275
3 1/4"218032218325
3 1/2"218035218350
3 3/4"218037218375
4 1/4"218042218425
4 1/2"218045218450
4 3/4"218047218475
5 1/4"218052218525
5 1/2"218055218550
5 3/4"218057218575

Primary Uses:

  • Bottom Layer Continuous Support – Post-Tensioning, Rebar, or Wire Mesh
  • Elevated Slab Construction
  • Tilt-up Concrete Wall Panels*
  • Side Form Spacer for Walls & Columns


  • From ¾” to 2” (in ¼” increments)
  • From 2-½” to 4” (in ½” increments)


  • Feet that can be stapled
  • Points on legs assure minimal surface contact
  • Manufactured in 5’-0” lengths

Product Applications:

  • DOT Department of Transportation
  • PC Precast
  • PT Post-Tensioned
  • SE Slab – Elevated
  • TU Tilt-Up
  • WC Walls & Column

See Patents for a listing of many of the patents licensed to GTI, including patents that may cover one or more of the products identified on this page.

Notice of exclusive terms and conditions: all sales or purchases by gti respectively incorporate and adopt gti’s standard terms and conditions of sale or purchase and the specific terms (e.g. delivery, price, quantity) of each specific transaction all as set forth in the controlling purchase order.

PROPER CARE AND USAGE: Do not leave GTI Bar Supports in the sun or in bright daylight for prolonged periods of time – composites, plastics, and bags may become brittle; the material used to manufacture GTI Bar Supports is physiologically safe and resistant against all acids and alkaline solutions used in the construction industry; do not apply oils, release agents, or similar products to GTI Bar Supports; under certain conditions small rupture may occur at the surface of concrete in the vicinity of GTI Bar Supports when too much oil or release agent is used on the formed surface – further causes may be poor cleaning of the concrete surface and improper use of primer when painting; GTI Bar Supports have been used world-wide in every climatic condition without complaint.