Concrete dobies and form spreaders are cementitious rebar supports used to hold reinforcing steel at the correct height and spacing during concrete placement. By maintaining consistent concrete cover between the reinforcement and the ground, formwork, or surrounding surfaces, these supports help ensure the structural strength, durability, and corrosion protection specified for reinforced concrete.

Because they are made from concrete rather than plastic, dobies share the same physical properties as the surrounding pour and provide a stable, settlement-resistant base for on-grade reinforcement. Most dobies are produced in a standard 4000 PSI mix, with higher-strength custom mixes available on request. They are D.O.T. approved in most states and qualify as a CRSI Class 1 Bar Support.

Concrete dobies are available in several configurations to suit different reinforcement layouts. Plain dobies provide simple, fixed-height support for on-grade work; wire dobies include integrated 16 gauge tie wires for securing the support directly to rebar; dowel dobies are designed to carry two mats of reinforcement when used with bent dowels; and combination dobies use molded grooves to deliver multiple cover heights from a single unit.

Form spreaders are concrete spacers used to maintain the correct distance between form faces and reinforcement in bridge decks, abutments, walls, and other forming applications. Available in a range of lengths and heights, with custom and reinforced options for wider forming widths, they help crews hold spacing accurately while protecting formwork during placement.

Vista Construction Supply offers durable concrete dobies and form spreaders designed to maintain reliable reinforcement placement and consistent concrete cover across on-grade, structural, and infrastructure concrete projects.