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Exterior system evidence record

Natural stone exterior systems

Evaluate stone as an assembly: geology, absorption, freeze–thaw exposure, anchorage or bond, joints, drainage, and compatible adjacent materials.

Exposure lensesExposure lensesThe conditions most likely to influence this material system's durability, detailing, or upkeep. They do not grade or approve a product.
  • Freeze–thaw
  • Moisture
  • Deicing salts
  • Movement
Plain-English terms used in this record
Assembly
The complete built system—not only the visible finish. It can include structure, backing, membranes, fasteners, joints, drainage, and adjacent materials.
Substrate
The surface or supporting material underneath the finish, coating, membrane, or adhered product.
Interface
The place where two materials, trades, or systems meet. These transitions often need explicit drainage, movement, and responsibility details.
Mockup
A small sample installation used to approve appearance, workmanship, joints, transitions, or performance before the full installation proceeds.

Research-supported principles

What this means for an owner.

  1. 01

    Stone type alone does not establish exterior suitability; source-specific properties and test data matter.

  2. 02

    Water management behind, beneath, and at transitions is a system decision—not a surface-detail decision.

  3. 03

    Joint geometry, movement accommodation, and compatible mortar or setting materials should be resolved with the assembly.

Project-team questions

Resolve before products are ordered or the work is covered.

  1. What source-specific absorption, density, and durability documentation is available?
  2. Where does bulk water drain, and how are horizontal surfaces protected?
  3. Which movement and dissimilar-material interfaces require deliberate joints or separation?

Federal evidence record

Open sources used

Source credit identifies the research record. It does not imply agency authorship, endorsement, product approval, or a parcel-specific conclusion.

National Park Service · Preservation Brief 1National Park Service · Masonry guidance

Verification boundary

What still belongs to the project team

Confirm the actual product, source, testing, exposure, substrate, fasteners, anchors, coatings, compatible adjoining materials, installation instructions, mockups, warranties, maintenance plan, jurisdictional requirements, and responsible licensed professionals. The Atlas is an evaluation framework—not a specification.

Read the Registry methodology →