Construction Recycling Programs: The Waste Diversion Practice Reducing Disposal and Supporting Sustainability

Construction and demolition (C&D) waste makes up substantial portion of landfill volume — estimated 25-30% of US landfill content. Recycling programs divert C&D waste through source separation (separate dumpsters per material type) or single-stream (mixed dumpster sorted off-site). Metal, concrete, asphalt, wood, drywall, and cardboard commonly recycled. LEED credits, local government mandates, and increasingly favorable economics drive adoption. Understanding C&D recycling helps contractors implement effective programs.

This post covers construction recycling programs.

Why Recycle

Multiple drivers for C&D recycling:

Drivers vary. Local ordinances mandate diversion in many cities (50-75% diversion typical). LEED credits for waste diversion (MR credit). Owner sustainability requirements. Cost savings on metals especially. Avoided landfill tipping fees. Tax credits in some jurisdictions. Marketing and reputation. Resource conservation.

Common Recyclable Materials

Multiple materials recyclable:

Materials commonly recycled. Concrete and masonry crushed for aggregate replacement. Asphalt recycled into new pavement. Metals (steel framing, copper piping, aluminum) substantial value. Clean untreated wood. Drywall in markets with processors. Cardboard from packaging. Plastic packaging. Carpet and ceiling tiles through specific manufacturer takeback programs.

Source Separation vs Single-Stream

Two main approaches:

Source separation has separate dumpsters per material type — concrete, metal, wood, drywall, etc. Higher diversion typically since materials separated cleanly. Requires more space and discipline on site. Single-stream uses single mixed dumpster sorted off-site at recycling facility. Simpler on site but lower diversion typically. Hybrid approaches common — separate metals (high value) plus single-stream rest.

Concrete and Masonry

Concrete dominant by volume:

Concrete and masonry dominant C&D waste by volume. Crushed for aggregate replacement (RCA — Recycled Concrete Aggregate). Used in road bases, fill, drainage layers commonly. Limited use in new structural concrete (specific ACI provisions). Crushing on-site or at processor. Substantial volume diverted from landfills.

Demolition Recycling

Demolition substantial recycling opportunity:

Demolition substantial recycling opportunity. Selective demolition rather than full gut salvages valuable materials. Fixtures, doors, hardware reusable. Architectural elements (mantels, woodwork). Structural steel salvage. Source separation during demolition. Recycling processors handle bulk materials.

Metals Recycling

Metals have positive value:

Metals positive value — contractors typically receive payment for metals scrap. Steel from framing and rebar. Copper piping and wiring. Aluminum from windows and conductors. Generates scrap revenue offsetting disposal costs elsewhere. Theft concerns on site — secure storage. Easy to separate. High-value materials.

LEED Credits

LEED credits incentivize:

LEED v4 Construction and Demolition Waste Management credit awards points for specific diversion thresholds. Documentation by weight and material type. Calculation methodology specific. Salvage and reuse count. Recycling and donation count. Documentation supports credit achievement.

Documentation

Documentation supports compliance:

Documentation supports compliance and credit. Hauling records by load. Tonnage by material type. Recycling facility receipts confirming diversion. Diversion calculations percentage. LEED credit submission documentation. Code compliance for local mandates. Specific format requirements per program.

Bottom Line

Construction recycling programs divert C&D waste from landfills. Drivers include local mandates, LEED credits, owner requirements, and economics. Common materials include concrete, metals, wood, drywall, cardboard. Source separation typically higher diversion than single-stream. Concrete dominant by volume. Demolition substantial recycling opportunity. Metals positive value. LEED credits incentivize. Documentation supports compliance and credits. Field implementation determines success. For contractors on sustainability-focused projects, recycling programs are integral. For all contractors, increasing local mandates make C&D recycling standard practice. Understanding programs supports compliance and competitive position.