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Largo Concrete Inc.

Company Profile

Largo Concrete contractors specializing in multi-level, cast-in-place structures and we are proud to self-perform the entire scope of work. Building on decades of product specific experience we also offer structural design-assist and turnkey design-build parking structure services. Largo Concrete, Inc. was formed in 1989 by post-tensioning and concrete veterans Harold (Hal) Long and Mark Carnathan. Hal is an accomplished student athlete having twice won the Big Eight conference championship in the mile and breaking the American record in the four mile relay while at the University of Kansas. He became one of the original inductees into the Post-Tensioning Institute’s Hall of Fame for his contributions to the industry prior to forming Largo Concrete. Hal is credited with the invention of the anchor which holds single strand post-tensioned cables to the slab edge, a device which is still used around the world. The Spanish translation of Hal’s last name, “Largo,” is the name of the company. Mark Carnathan was introduced to Hal by an engineer who knew both of them. Mark had substantial experience in concrete, having worked for multiple specialty subcontractors before starting Largo Construction, a general contracting firm, with Hal. After a few years, the two realized that their extensive experience in concrete construction would be better applied as a specialty subcontractor and Largo Concrete was born.


Member since 2022

Location (View all locations)

2741 Walnut Ave Fl 1
Tustin, California 92780-7037
(714) 731-3600

Primary Contact

Dave Tennis
(714) 731-3600


Contracting: Tilt-Up Sub, Contracting: Design/Build, Contracting: General, Contracting: Concrete Sub

Logo for Largo Concrete Inc.

Representative Work

Tilt-Up Today Magazine  /  Members in the News


Recognition (Professional)

Recognition (Project)

Displaying 0 of 0 award-winning projects.


While physical office locations are presented below for this company, it is important to understand that many tilt-up professionals work regionally, nationally, even globally. Listed here are this company's areas of operation/licensure.

US States and Territories: Arizona, California, Hawaii, Nevada, Texas, Washington


Largo Concrete Inc.

2741 Walnut Ave Fl 1
Tustin, California 92780-7037

Phone: (714) 731-3600

Largo Concrete Inc

591 Camino De La Reina Ste 620
San Diego, California, 92108-3108

Phone: (619) 356-2142

Largo Concrete Inc.

891 W Hamilton Ave
Campbell, California, 95008-0402

Phone: (408) 874-2500

Largo Concrete Inc.

2850 W Horizon Ridge Pkwy Ste 200
Henderson, Nevada, 89052-4395

Phone: (702) 754-6622

Largo Concrete Inc.

1524 S Interstate 35 Ste 202
Austin, Texas, 78704-2671

Phone: (512) 765-9364


TCA's Tilt-Up Academy Private Classrooms offer a dedicated selection of continuing education offerings curated for your organization. Access is streamlined for company employees and reports are submitted to employers for goal tracking. For more information on this program, contact the TCA at (319) 360-8738 or email mbloomquist@tilt-up.org.