Urban wood

Overview

Urban wood is lumber from trees and structures that have left the urban environment: street and yard trees felled for storm damage, disease or construction, and timber from deconstructed buildings. The USRW Certified Urban Wood standards define it as wood not harvested for its timber value and diverted from the waste stream, from three sources: deconstruction, fresh-cut urban trees and salvaged trees. Furniture makers choose it for the story, local provenance and the unusual figure that old yard trees often show.

Pros

• Local, with a story you can tell the client: this tree stood in your city.
• Large, old and often figured specimens, including burls, crotches and spalting.
• Keeps wood from landfill, mulch or firewood.
• Species range from walnut and oak to elm, cherry and maple, depending on what the city planted.

Cons

• Quality is variable: knots, included metal, rot and ring shake are common.
• Species, drying history and defects are unknown unless the miller documents them.
• Usually cut green; slabs take years to dry and may split or warp.
• Supply is irregular and in small lots; chain of custody is voluntary.

Variants and subspecies

• Fresh-cut urban trees: logs from storm, disease or development removals.
• Salvaged trees: trees removed earlier that can include stored or aged logs.
• Deconstruction timber: lumber from demolished buildings, which overlaps with Reclaimed lumber.
• Slabs and boards: most urban logs are sawn into Live-edge slabs because of size and irregularity; sawn boards are sold as urban lumber.

Working and finishing

Treat every log as a source of hidden metal: nails, fence wire and bolts grown into trunks. A Forest Service study of deconstructed lumber found broken-off nail shanks missed by visual inspection and used a hand-held detector to find them. Run a detector before milling. Expect reaction wood and internal stress, so rough-cut oversized, let boards rest and re-mill. For drying, see Live-edge slabs.

Staining and finishing colour

Behaviour is species-driven: walnut and cherry darken naturally, maple blotches, oak takes dye well. Metal stains (black streaks where iron meets tannins) are common in urban logs. Sap-stain, spalting and old wounds can show through finishes as accents or flaws; test finishes on offcuts from the same board.

Sustainability and handling

The USRW terms define chain of custody as the documented path from urban forest, orchard or deconstruction site to the consumer; look for it if provenance matters. Wood from trees killed by emerald ash borer (EAB) can be milled: APHIS removed its domestic EAB quarantine regulations in 2020 (effective 14 January 2021), though Wikipedia notes EAB spreads by moving firewood and ash bark, so check state and local rules before moving ash. A 2012 Forest Products Laboratory and University of Minnesota publication covers using wood from trees killed by invasive species. Dust is an irritant; use extraction.

Popular projects

Live-edge dining and coffee tables, benches, shelves, mantels, cutting boards and turned bowls from the biggest logs, plus flooring and cabinetry from deconstruction stock.

Buying notes

Buy from urban sawmills, tree-service partnerships and local slab dealers; ask for species, source location, how it was dried and whether the stock was metal-scanned. Kiln-dried rustic walnut slabs from a regional mill were listed at $3 to $10 per board foot, an indicative baseline only. Avoid wet slabs unless you can dry them, and avoid ash from quarantine areas without checking local rules.