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Specific material planning profile

Durable hardwood

A broad category rather than one performance class; species, source, density, movement, fasteners, weathering, and replacement availability must be identified.

Material category
Exterior timber & wood finishes
Common exterior uses
Decking, screens, gates, benches, stairs, handrails, cladding, and exterior millwork.
What is scored
Specification attention for this named material type—not quality, beauty, durability, or a particular product.
Illustrative Durable hardwood sample cropped from the exterior timber & wood finishes comparison board
Illustrative Durable hardwood study—not a named product, quarry, mill, approved finish, test specimen, or installed project.

How the five-point scale works

Higher means more confirmation—not better material.

The Registry uses this scale to show how much project-specific specification attention a factor deserves for Durable hardwood. It is an editorial planning framework, not a laboratory result or product certification. No factors are averaged into an overall grade.

Levels are assigned from two questions: how consequential an unresolved factor could be, and how specific the evidence must be before commitment. They do not predict service life or failure.

  1. 1Limited

    Confirm the standard submittal and installation requirements.

  2. 2Secondary

    Review the factor, but it is unlikely to control the decision by itself.

  3. 3Material

    Give the factor explicit project-specific specification attention.

  4. 4High

    Resolve the factor before approval because it can materially affect the result.

  5. 5Critical

    Require source-, product-, exposure-, or assembly-specific confirmation before commitment.

Specification-attention profile

What deserves attention for Durable hardwood.

Every score below belongs to the named factor for Durable hardwood. It does not describe the other examples in exterior timber & wood finishes.

  1. 5/ 5
    Critical attention

    Species and sourcing

    Registry rationale

    Durability, density, movement, availability, and responsible sourcing vary by species and supply chain.

  2. 5/ 5
    Critical attention

    Movement and detailing

    Registry rationale

    Moisture change, board geometry, ventilation, spacing, and restraint affect checking and distortion.

  3. 5/ 5
    Critical attention

    Fasteners and fabrication

    Registry rationale

    High density can affect drilling, screws, plugs, adhesives, cutting, and edge distances.

  4. 4/ 5
    High attention

    Finish and weathering

    Registry rationale

    Maintaining original color can require a different service commitment than allowing natural weathering.

Before approval

Verify the actual selection.

  • Botanical species, grade, certification, source, and replacement supply
  • Moisture condition, spacing, ventilation, and movement details
  • Fastening, predrilling, plugging, and fabrication procedure
  • Approved appearance sample and maintenance commitment

Owner questions

Ask the project team.

  1. Which species is actually specified, and how is sourcing documented?
  2. What movement and checking are acceptable?
  3. Can future replacement boards match the original supply and dimensions?

Evidence and limits

Open supporting sources

These sources support the broader material-system principles. The five-point values are contractor-informed Registry editorial judgments under the published rubric; the sources do not assign those numbers. Current manufacturer literature, project specifications, source-specific test data, and local requirements must govern the actual selection.

Read the Registry methodology →
USDA Forest Products Laboratory · Wood HandbookSupports: Wood properties, moisture, durability, finishes, fasteners, and use conditions across species and assemblies.USDA FPL · Finishes for exterior woodSupports: Exterior wood-finish selection, exposure, preparation, weathering, and maintenance principles.

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