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Concord engineers propose switch to galvanized guardrail for longer life and lower cost
Summary
Town engineers told the Public Works Commission they plan to move from weathering-steel beams and timber posts to galvanized steel beams and posts for most guardrail replacements, citing faster deterioration of weathering steel in this climate and Federal/State practice.
Assistant Town Engineer Justin Richardson and Town Engineer Steve Dukerne briefed the Public Works Commission on March 12 on a proposed change to the town's guardrail specification: move to galvanized steel beams and galvanized posts instead of the current preference for weathering steel with timber posts.
The engineers said many existing guardrail sections are in poor condition and that weathering steel corrodes faster in Concord's wet climate, shortening life expectancy compared with galvanized systems. "We would like to use galvanized steel for the beam as well as the posts," Justin Richardson said, adding that galvanized systems have longer service lives and are generally less expensive over the life cycle.
Why it matters: The town has about 6.35 miles of guardrail in its inventory and replacement needs far outpace current funding. Engineers showed photos of failing joints and rotted timber posts and said the Federal Highway Administration and Massachusetts Highway guidelines increasingly favor galvanized materials in wet, salty or frequently raining environments. The presenters said the timber post installations tend to rot faster and can damage sensitive underground infrastructure when posts are installed.
Commission response and caveats: Commissioners broadly supported the change for safety and lifecycle-cost reasons but raised aesthetics and historic-district concerns. Several commissioners said safety should be the priority; others asked staff to identify how many guardrail miles sit within Concord's historic district or near the Minute Man National Historical Park and whether powder-coating or wood-faced options might be applied selectively in sensitive areas. Engineers said powder-coating would significantly increase cost, and they plan to map guardrail locations against historic and park zoning to identify exceptions.
No vote was required: Staff presented the change as an operational standard update and will return with a formal design-standard revision and a map showing guardrail locations in historic or park-sensitive areas. Engineering said the current design standard already allows galvanized beams and that the additional change concerns the post type and some end-treatment specifications.
Ending: The commission asked staff to return with a standards update and a location map showing historic-district or National Park-adjacent segments so the commission can consider targeted aesthetic treatments while proceeding townwide with the safety-driven switch where appropriate.
