The Fifth Fuel

The Fifth Fuel operates as an insulation contractor serving Manassas, Northern Virginia, Metro Maryland, and Washington DC with a 4.9-star rating accumulated across 323 customer reviews. This locally owned contractor specializes in home performance solutions, offering attic insulation, crawl space encapsulation, wall insulation, and comprehensive energy audits designed to improve residential comfort and efficiency throughout the region. The company maintains standard weekday hours from 6 AM to 5 PM, closed on weekends, and can be reached directly at (703) 368-1479 for free estimates.

This contractor distinguishes itself through building science expertise, employing blower door testing with infrared camera technology to diagnose exact locations of energy loss before recommending insulation upgrades. As an ENERGY STAR Partner, the company accesses manufacturer rebate programs and participates in EnerBank financing options, making energy efficiency upgrades more accessible to homeowners. Their service menu includes spray foam insulation, blown-in cellulose, and fiberglass installations, along with air sealing as a foundational step before adding insulation material.

Homeowners who reviewed The Fifth Fuel highlight specific technicians by name, particularly Will T., who Multiple reviewers describe as knowledgeable, responsive, and low-pressure in his consultations. One customer detailed attic insulation removal with foam-sealing of all seams, joints, and vents before installing blown-in cellulose, while another praised the crew for keeping the home spotless during the entire process. A third reviewer noted immediate comfort improvements throughout the home after air sealing and reinsulating both attic and crawl space areas.