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Precast Concrete Double Tees
Long-span prestressed floor, roof and deck members for parking structures and large buildings.
Overview
What are precast concrete double tees?
A double tee is a prestressed precast concrete member with a wide flat deck, called the flange, supported by two deep ribs, called stems. The shape gives it a high strength-to-weight ratio, so one double tee can span a long distance and carry heavy loads while using relatively little concrete.
Precast concrete double tees are cast in our plants under controlled conditions, then trucked to site and set by crane. Our load tables for the Arizona plant, for example, cover double tees from 24 to 50 inches deep in 8, 10 and 12 foot widths. Contact your nearest plant for the sizes it produces.
Because each member covers a large area in one lift, a crew can erect a parking deck or roof quickly, with fewer columns and beams than most other systems need.
Where it is made
Made at these Coreslab plants
Each plant confirms what it makes and the services it offers. Choose a location to see its full capabilities. Links open in a new tab.
- Conway, Arkansas (opens in a new tab)
- Indianapolis, Indiana (opens in a new tab)
- Los Angeles, California (opens in a new tab)
- Marshall, Missouri (opens in a new tab)
- Miami, Florida (opens in a new tab)
- Oklahoma City, Oklahoma (opens in a new tab)
- Phoenix, Arizona (opens in a new tab)10DT24, 12DT28, 12DT32, 10DT36, Specialty forms available
- Tampa, Florida (opens in a new tab)12' x 30", FDOT 10' x 37"
Do not see your nearest plant? Contact us and we will point you to the right location.
Applications
Where double tees are used
Parking structures
Long spans that open up parking bays and drive aisles
Durable decks that handle vehicle loads and weather
Pairs with precast columns, beams and spandrel walls
Commercial and industrial
Roofs and floors for warehouses, retail and offices
Wide open floor plans with few interior supports
Fast enclosure to protect the interior from weather
Transportation
Short-span bridge and deck applications
Standard shapes with published load tables
See our Tampa bridge tee load tables in the library
Resources
Design data and guides
Start with our precast parking structure design guide, then see joints in precast parking structures and the maintenance manual for parking structures. Load tables for each plant are in our resource library, and the Precast/Prestressed Concrete Institute publishes the industry design standards our plants follow.
Explore our parking structure projects or the other precast concrete products we manufacture.
Process
From design to delivery
Precast concrete double tees start with engineering. Our team works with the design team to confirm spans, loads, bearing and connections. The members are then cast in a plant on prestressing beds, cured under controlled conditions and checked by our quality staff before they ship.
Our plants follow the quality programs of the Precast/Prestressed Concrete Institute, so every double tee meets the same dimensions and strength requirements.
Members are trucked to site in the order they will be erected. A crew sets each double tee on its supports and connects it to the structure, and the joints between members are finished. Coreslab provides delivery, installation, finishing and detailing, so one team can carry precast concrete double tees from the plant to a finished deck.
Questions
Precast double tees: common questions
Why are double tees common in parking structures?
Their long spans open up parking bays and reduce the number of columns and beams. Each member also covers a large area in one lift, so a deck goes up quickly.
Do double tees need a topping?
Some parking decks use a cast-in-place topping, and others use untopped double tees with sealed joints. The right choice depends on the design, the climate and the owner's maintenance plan.
How are double tees connected?
Double tees are connected to the supporting beams or walls with steel connections cast into the members and joined on site. Our guide to precast concrete connections explains the common types.
What sizes do you make?
Sizes vary by plant. Our load tables show the depths and widths each plant produces, and our team can confirm availability for your project.
Contact us
Planning a project with double tees?
Share your spans and loads and our team will recommend the right size and plant.
Get in touch