Why Architects Are Specifying Reclaimed Materials

The AIA 2030 Commitment and Embodied Carbon

The American Institute of Architects' 2030 Commitment is an influential framework for firms working to reduce the carbon impact of their buildings. Discussion has widened from operational energy to embodied carbon, the greenhouse gas emissions associated with manufacturing, transporting, and installing building materials.

Reclaimed lumber has a clear place in that discussion. Reusing a beam avoids cutting and milling a new one, and the carbon stored in the wood stays stored while it remains in use. Reclaimed material still has a footprint of its own, from removal, cleaning, re-milling, and transport, and whole-building life cycle assessment is the place to work out how it compares on a given project.

Distance matters too. A beam salvaged nearby and delivered to a job site in Edina has far less to travel than timber shipped from the Pacific Northwest, but not all reclaimed wood is local, so ask where it came from.

How Architects Evaluate Reclaimed Lumber

Specifying reclaimed lumber is not the same as specifying a manufactured product with predictable, factory-controlled properties. Key criteria include structural condition, species identification, dimensional consistency, moisture content, contaminant testing (particularly for lead paint and chemical treatments), and aesthetic character.

Structural use is the most demanding case. Old timber may have no grade stamp, and past use can leave hidden damage, so grading or evaluation by a qualified lumber grader or licensed structural engineer is usually needed. Check with the project's engineer and your local building official on what will be accepted. Many projects avoid the issue by using reclaimed wood in non-structural roles.

Dimensional consistency is another critical factor. Reclaimed lumber often comes in non-standard sizes: full-dimension sawn stock, odd widths, or hand-hewn timbers with natural taper. It is best to work with these dimensions rather than against them. Our dimensional lumber guide explains how sizes compare to modern nominal dimensions.

MasterFormat Considerations for Reclaimed Wood

Within the Construction Specifications Institute (CSI) MasterFormat framework, reclaimed lumber touches several divisions. Most commonly it falls under Division 06 (Wood, Plastics, and Composites), including rough carpentry, finish carpentry, and architectural woodwork. Reclaimed wood flooring typically goes under Division 09 (Finishes). Confirm section numbers against the edition your office uses.

The specification language differs from standard wood specifications in several ways. A reclaimed lumber specification needs to describe acceptable character marks, define tolerances for dimensional variation, outline testing for contaminants, and state what information about the material is expected. Some firms use a separate section for reclaimed wood so that these requirements stay apart from standard framing specifications.

Because reclaimed lumber is inherently variable, the specification should define acceptable ranges rather than single-point targets. For example, rather than specifying "8-inch width," a reclaimed lumber spec might read "7-3/4 to 8-1/4 inch face width, measured after milling."

Questions to Raise with Suppliers

A workable specification depends on what suppliers can actually deliver. Four topics deserve an early conversation.

Timing is usually the biggest concern. Reclaimed lumber availability depends on what is coming out of buildings, and it cannot be ramped up like mill production. Raise the subject during design development rather than at the last minute, and allow time for any milling. A partner supplier can tell you what is realistic.

Quantity matters because running short mid-installation can stop a job, and a later batch may not match. Find out whether the full quantity can be identified before you commit, and allow a higher waste factor than you would for new lumber, because some pieces will not make the grade after milling.

Quality does not mean uniformity. It means predictability within a defined range. Agree what a character level looks like, using samples, before the order is placed.

Records vary a lot by supplier and source. If your project needs information on origin, species, or testing, say so at the outset and ask what is available.

Green Building Standards

Reclaimed materials can be relevant to green building programs, including LEED, which addresses sourcing, reuse, life-cycle impact, and construction waste among its concerns. The details differ by rating system and version, so check the current LEED reference guide with your project team.

For a general overview, read our guide to LEED and reclaimed materials.

Reclaimed Wood as a Design Material

Beyond any metric, architects choose reclaimed wood for how it looks and feels. Exposed original timbers are a defining feature of adaptive reuse in the Minneapolis Warehouse District, and new work can draw on the same qualities.

The material also brings a sense of place. Wood with a known local history can connect a new building to the region's milling and farming past, if the story is true and can be supported.

Contrast is often what makes it work. Set against clean modern surfaces, an old timber or a weathered board shows its texture and age to best effect.

Biophilic Design and Natural Materials

Biophilic design, the practice of bringing natural elements into built environments to support human well-being, has become a familiar idea in architecture, and natural wood is one of its most obvious materials.

Reclaimed wood suits this approach. It shows its biological origin in grain patterns, growth rings, and color variation, and it adds the patina of time. The weathered surface of a barn board or the smooth wear of a factory floor plank is hard to imitate.

In offices and public buildings around Minneapolis, reclaimed wood can serve design and reuse goals at once. Where the WELL Building Standard or similar programs are in play, choose finishes with care.

Client Interest in Authentic Design

Architects respond to client priorities, and many clients want materials with authentic character and a credible environmental rationale.

In the commercial sector, some companies have sustainability goals that shape material choices. Reclaimed lumber can be part of the answer, provided that its benefits are stated honestly and backed up.

In the residential sector, homeowners often arrive at design meetings with images of reclaimed wood interiors. It helps to be able to explain which species suit which uses, what finish is appropriate, and what the material will look like with its variation. Browse our reclaimed lumber page for an overview.

How to Write Specifications for Reclaimed Lumber

Writing a specification for reclaimed lumber takes more nuance than specifying a standard manufactured product, but it is straightforward once you understand the variables. The familiar three-part format works well as a starting point.

Part 1 — General: Define the scope of reclaimed wood use in the project. State the quality requirements, including species verification, structural evaluation where it applies, moisture content (typically 6-8% for interior applications in Minnesota's climate), and any contaminant testing. List what must be submitted, such as samples and information about the material.

Part 2 — Products: Describe the acceptable material characteristics. Specify species or a list of acceptable species, dimensions with tolerances, acceptable character marks, and finish requirements. State any source requirements that genuinely matter to the project, keeping in mind that each restriction narrows the supply.

Part 3 — Execution: Describe installation requirements, including acclimation in the conditioned space until moisture readings are stable, fastening methods, expansion gaps, and protection during construction. Specify any field finishing and the final inspection criteria.

Check your draft against what the market can realistically deliver. A short conversation with a supplier during the specification phase can prevent change orders later.

The Role of Material Samples and Mockups

Because reclaimed lumber is inherently variable, samples and mockups matter more than they do for manufactured products. A tiered approach builds confidence at each stage.

During schematic design, small hand samples help the architect and client understand species color, grain character, and the range of variation to expect. Ask for several pieces that span the range, not just the best one. During design development, longer samples show how the material looks at a more realistic scale, including how nail holes and other marks are distributed. Finish them with the specified finish so color and sheen can be evaluated.

For significant installations, such as a feature wall, a large floor area, or exposed timbers, a field mockup is well worth considering. A small section installed on-site with the specified method and finish then becomes the standard against which the full installation is judged. This adds time and cost, but it greatly reduces disputes. When you send a request, mention that you need samples and a partner supplier can tell you what is possible.

Looking Ahead

Interest in embodied carbon is likely to keep reuse on the agenda. Requirements and tools are moving quickly, so check what currently applies to your project and your jurisdiction with your local building official.

Digital modeling and life cycle assessment tools are also making it easier to weigh material choices early in design, though reclaimed products can be harder to model than manufactured ones with published data.

The larger question is no longer whether reclaimed materials belong in architectural specifications, but how to specify them well.