| Business | Phone |
| F V Vleck Co 2300 Sinclair Ln, Baltimore 21213 | (410) 276-8500 |
| Insulation Specialites Inc 7609 Energy Pkwy # 302, Baltimore 21226 | (410) 439-3758 |
| V & P Insulation Co Baltimore 21212 | (410) 433-2709 |
| Summit Insulation Corp 3309 Benson Ave, Baltimore 21227 | (410) 644-8000 |