Modern fiber cement siding does not contain asbestos. While older asbestos-cement siding and contemporary products look nearly identical, the key difference lies in their reinforcement materials. Modern versions use cellulose fibers instead of hazardous asbestos.

However, it is important to note that many older homes in the Centennial area may still have original asbestos-containing siding. Because legacy and modern products share a similar Portland cement matrix, visual inspection alone is insufficient to tell them apart. We recommend the following steps for safety:

• Professional Testing: Always have existing siding analyzed in a lab before starting any renovation. Laboratory testing is the only reliable way to confirm the material’s composition.
• Expert Handling: If your siding is found to contain asbestos, it is classified as a Category II nonfriable material. Projects disturbing more than 160 square feet must follow specific federal NESHAP regulations for removal and disposal.
• Modern Safety Precautions: Even with asbestos-free modern siding, professional installation is vital. Cutting these materials with power tools generates respirable crystalline silica dust, which requires specialized dust-collection systems to meet OSHA and NIOSH safety standards.

Whether you need Exterior Work or a complete home transformation, we can guide you through testing, permitting, and safe installation. Let us help you get your project started with our local expertise in Denver and Centennial code requirements.

Please consult a licensed contractor for definitive advice; verify licensure with the Colorado Department of Regulatory Agencies (DORA). Estimates are preliminary and subject to change after site inspection and a full scope review. Project outcomes and timelines may vary based on site conditions, permitting, material availability, and unforeseen issues.

• Is Cement Fiber Siding Asbestos? The Complete Safety Guide