Petrin Corporation has got you covered. The company fabricates, distributes, and installs industrial insulation. Other services include asbestos and lead abatement, scaffolding erection, marine insulation, sand blasting, and power washing, as well as the application of specialty coatings for fireproofing, noise abatement, and tank linings. The company also supplies and installs removable covers for underground piping, exhaust systems, energy conservation, and protection against freezing. Founded in 1972, Petrin Corporation serves the chemical, marine, oil, petrochemical, power, sugar, and pulp and paper industries.

Marshfield just adores portals. Marshfield DoorSystems is a leading maker of commercial architectural wood doors in the US. The company sells its door and accessory products to the commercial construction industry nationwide. Marshfield DoorSystems offers customers more than 3 million possible made-to-order combinations of doors. The company's history dates back to Axel Hatteberg's establishment of Hatteberg Veneer Company in 1890. Before it was bought by Marshfield DoorSystems in 2000, the company was Weyerhaeuser's door division. Private equity firm Wind Point Partners and Marshfield DoorSystems' management own the manufacturer.

Ryan Companies US is a commercial real estate development and property management company that offers design/build construction, architectural, and engineering services and facilities management services for office, industrial, retail, hospitality, health care, multifamily residential, public sector, mission-critical, and mixed-use projects nationwide. Its real estate management division oversees more than 10 million sq. ft. of office, industrial, and retail space. Clients have included Ford, Heinz, Isle of Capri, John Deere, Target, and Verizon . Ryan Companies has nearly 10 offices throughout the US.

Toxic mold and environmental air quality are just two of the concerns of Environmental Health & Engineering. The engineering and health and safety services firm offers consulting services geared towards creating healthier work environments in buildings ranging from large office complexes to suburban schools. Its services range from studies of the effects of pollutant exposure to human health, to risk assessments, to support the commissioning of research laboratories, to advice on federal compliance requirements. In 2009 it was contracted by the Consumer Product Safety Commission to study air quality in homes built using Chinese-made drywall. The group was founded in 1988 by Harvard lecturer Jack McCarthy.

Founded in 1929 by Leon F. Driscoll, the company provides construction management, general construction, and design/build services for commercial projects. It has expertise in a wide range of sectors, including corporate, health care, education, sports/entertainment, and residential markets. L.F. Driscoll specializes in construction management at-risk contracts, or projects in which the job is completed within a guaranteed maximum price. The company serves clients throughout Delaware, Maryland, New Jersey, and Pennsylvania. International construction group The Structure Tone Organization is buying L.F. Driscoll.

Mapledean Developments Limited develops real estate and builds homes in the South Hampshire area in and around Southampton, Winchester, the Meon Valley, and Bishop's Waltham. Mapledean offers homes at Vears Lane, Colden Common for about 370,000 as well as one- and two-bedroom apartments in Bishops Waltham that range in price from 125,000 to more than 167,500. The company actively seeks development sites from single plots to larger schemes. Mapledean also assists customers with plot development. Mapledean Developments was established in 1991 by directors Jeff Adams and Nigel Freemantle.

Workman Commercial is always on the job, particularly if the job has anything to do with commercial construction projects in the Lone Star State. Paul Workman established the family-owned enterprise in 1971 and incorporated the company in 1991. The commercial builder focuses on health care, office, recreational, and retail projects (including more than 80 store locations for Walgreen Co.) throughout Texas. It also builds government and religious facilities. CEO Paul Workman owns a majority stake in the company, which has offices in the Austin, Dallas/Fort Worth, and Houston metro areas.

A. G. Spanos Companies bridges many operations -- from building, managing, and selling multifamily housing units to constructing master-planned communities, as well as developing land and building commercial space. With divisions and operations in about 10 states, the firm has built about 2 million sq. ft. of office space properties, 120,000-plus apartment homes, and more than 400 developments. Other operations include mixed-use development and property management. Alex Spanos also owns the NFL's San Diego Chargers. He operates the companies with his sons Dean (president and CEO) and Michael Spanos (EVP).

Fiberesin Industries designs and manufactures custom engineered products for original equipment manufacturers. Using wood composites, paper, specialty plastics, resins, and laminates, the company produces a variety of components and subassemblies that clients use to make office furniture, cabinetry, medical products, doors, windows, and squash and racquetball courts. Fiberesin Industries' materials are meant to help enhance the durability, impact resistance, vapor resistance, structural integrity, performance, and appearance of clients' finished products. The company closed its Rodman Industries affiliate, which made particleboard, in 2006. Fiberesin Industries was founded in 1946.

Lochinvar knows that being in hot water doesn't always mean trouble. The family-owned company makes commercial and residential hot water generators, pool heaters, water heaters, storage tanks, boilers, and related parts and accessories. The company also offers high-efficiency products. Lochinvar distributes its products throughout the US and Canada, and exports to Europe, Australia, the Pacific Rim, and the Middle East. Walter Vallett Sr. founded the predecessor to Lochinvar in 1919.

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