Exhibit 21.1
| Registrant’s Subsidiaries |
| Antigua Heavy Constructors, Ltd. |
| Bahamas Construction and Development, Ltd. |
| Bouwbedrijf Boven Winden, N.V. |
| Devcon Construction & Materials Corp. |
| Devcon/Matrix Utility Resources, LLC |
| Devcon Security Holdings, Inc. |
| Devcon Security Services Corp. |
| Devcon Management Corp. |
| DevMat Bahamas Ltd. |
| M21 Industries, Inc. |
| Mutual Central Alarm Services, Inc. |
| Proar Construction Materials Company, N.V. |
| Puerto Rico Crushing Company, Inc. |
| St. Maarten Masonry Products |
| Stat-Land Burglar Alarm System & Devices, Inc. |
| V.I. Cement and Building Products, Inc. |
| V.I. Excavation Equipment Rental, LLC |