How Mainers can navigate wood’s role in sustainable home construction | Column
Maine Builders Turn to Reclaimed Wood and Certified Sources to Cut Their Carbon Footprint
Maine’s construction scene is shifting toward greener choices, with local builders increasingly turning to reclaimed timber and certified forest products to lower the environmental impact of new homes and renovations. Experts say that buying secondhand, untreated wood not only preserves forests and reduces landfill waste but also sidesteps the chemical risks associated with some pressure‑treated lumber.
Secondhand Timber Keeps Trees Out of the Ground
Across Midcoast Maine, architectural salvage stores and ReStores stock beams, flooring, boards, windows, and doors salvaged from demolished houses and barns. The wood is typically untreated, meaning it contains no added chemicals and can be safely used without the risk of lead paint—unless the original building pre‑dates 1978.
“Using reclaimed material is a win‑win,” said David Conwell, a member of Citizens’ Climate Lobby and former volunteer on Brunswick’s Sustainability Committee. “It keeps trees from being cut and saves space in landfills.”
Certified Forest Products Offer a Safer Alternative to Virgin Lumber
When builders choose new wood, the source matters. Forest‑management certifications such as the Forest Stewardship Council (FSC), Sustainable Forestry Initiative (SFI), and Programme for the Endorsement of Forest Certification (PEFC) guarantee that the timber comes from forests that balance timber harvests with wildlife habitat and biodiversity preservation.
“Certified lumber tells you that the forest is managed responsibly,” Conwell explained. “But you still want to keep the journey short—picking wood locally reduces the carbon associated with shipping.”
The Dark Side of Pressure‑Treating
Pressure‑treated lumber, commonly used for decks and retaining walls, is impregnated with chemicals that deter rot, insects, and mold. While the extended durability of treated wood can be a climate‑friendly feature, the chemicals involved raise environmental concerns.
Until 2004, residential lumber was often treated with chromated copper arsenate (CCA), a known carcinogen. Since then, manufacturers have shifted to copper‑based formulations such as alkaline copper quat (ACQ), copper azole (CA), and micronized copper (MCA). Though these newer chemicals are considered less toxic, they can still leach into soil and groundwater.
“If you’re handling older treated wood, you have to use protective equipment, and burning it is definitely a no‑no,” Conwell cautioned. “Even with newer treatments, the risk of chemical migration into plants and animals means you should treat the wood with care.”
Low‑Carbon Concrete and Wood: A Balanced Approach
While low‑carbon concrete can cut greenhouse‑gas emissions from building projects, it’s not always the most sustainable option for every structure. Solid‑wood construction can be cleaner, especially when built from reclaimed or certified sources.
“Choosing the right materials is the first step in building a climate‑friendly home,” said Conwell. “When you combine local reclaimed wood with certified new timber and mindful use of pressure‑treated products, you’re making a real difference.”
Looking Ahead
Maine’s builders and homeowners are becoming more conscious of where their materials come from and how they affect the planet. By favoring secondhand wood, seeking out FSC, SFI, or PEFC stamps, and treating pressure‑treated lumber responsibly, the state’s construction industry can keep its carbon footprint down while still meeting the demands of modern, resilient homes.
