Architect’s Guide to Specifying Stone Decking: Systems, Details & Submittals

Stone decking specifications should begin with the assembly, not the finish. Establish whether rain may pass through the deck or whether the space below must remain dry. Then confirm the support structure, substrate, drainage, waterproofing responsibility, perimeter conditions, intended use, and evidence needed for approval.

Tanzite offers two distinct starting points: Appalachian board-style stone decking for suitable rain-through framed decks, and Rainier free-floating stone flooring for suitable waterproof assemblies. Neither collection resolves an unsuitable structure or an uncoordinated building-envelope detail. The architect’s task is to define the required performance and interfaces, request current product documentation, and coordinate the project-specific design before finalizing specification language.

Key Takeaway

Specify the water-management strategy first. Appalachian allows rain to drain between boards; it does not waterproof the area below. Rainier is the relevant Tanzite stone-flooring path for suitable waterproof projects, but the complete substrate, membrane, drainage, protection, edge, and transition design still needs to be established.

Use the current collection-specific instructions, approved project drawings, local requirements, and qualified design professionals to resolve details. This guide is a specification workflow, not an engineered assembly or code approval.

Appalachian vs. Rainier: Choose the Assembly Before the Finish 

The collection comparison is a useful first screen. It should lead to a documented system decision, rather than a generic callout for “stone decking.”

Confirm the proposed collection and product version with Tanzite before issuing drawings. The installation-guide hub links to the collection-specific resources; a detail developed for one collection should not be carried over to the other by assumption.

Establish Project Use and Design Conditions 

Record the intended occupancy and exposure before evaluating stone deck details. A residential deck above landscaping, a restaurant terrace above occupied rooms, and a wind-exposed rooftop may have different structural, waterproofing, access, maintenance, and approval needs.

The project brief should identify the space below; anticipated furniture, planters, grills, and equipment; wet-use and cleaning conditions; pedestrian circulation; and whether accessible routes apply. Note the exposure of entrances and edges, the expected drainage destination, and the party responsible for each adjacent system.

Clarify whether the work is new construction or an overlay. On an existing deck, determine what can actually be inspected. Concealed deterioration, movement, unsafe guards, or failed waterproofing should be assessed before a new walking surface is specified. NADRA’s deck-safety resources provide inspection context, including structural elements, connections, stairs, and railings.

Structural Support, Loads, and Existing Conditions 

The structural designer should evaluate the complete proposed assembly, including the finish, fastening or support components, subfloor, protection materials, guards, furnishings, planters, occupants, and construction staging. Consider movement and deflection as well as load capacity. No surface selection establishes that an existing frame, balcony, or roof can support the proposed use.

Request confirmation that the actual support conditions match the selected collection’s current instructions. Identify who will assess framing or subfloor condition, attachment points, changes in finished elevation, and any repairs. Where the existing structure cannot be verified, state the required investigation and approval process in the project documents.

Drainage, membranes, and waterproofing responsibilities

For Appalachian, show where rain passes through and how water drains safely from below the boards. If the space underneath must remain dry, a separately designed water-management solution would be required; do not describe Appalachian itself as waterproofing.

For Rainier, identify the designer and installer responsible for the substrate, waterproof membrane where applicable, drainage, protection, and testing. Obtain written compatibility input from the relevant product and waterproofing manufacturers for the proposed interfaces. Specify how water reaches drains or exits, how those locations remain accessible, and when concealed work must be inspected before the finish is placed.

As an analogy for rooftop assembly coordination, the Concrete Masonry & Hardscapes Association’s roof-deck guidance discusses structure, drainage, membrane compatibility, and wind for concrete paving systems. It is not an approval or installation guide for Tanzite.

Edges, Thresholds, Walls, Drains, Railings, Stairs, and Transitions 

A plan showing only the field surface leaves the highest-risk interfaces unresolved. Develop enlarged drawings and assign responsibility for at least these conditions:

• Perimeter and walls: Termination, restraint, movement, flashing, and any required inspection access.

• Doors and thresholds: Finished height, drainage direction, weatherproofing continuity, and the transition to the interior floor.

• Drains and penetrations: Access for cleaning and inspection, plus coordination with the membrane designer.

• Guards and railings: Attachment to the approved structure without an unreviewed penetration or conflict with the finish.

• Stairs and changes in level: Finish transitions, nosings where applicable, edge visibility, and coordinated dimensions.

• Adjacent materials: Changes to paving, cladding, siding, or another deck surface.

The drawings should distinguish the structural deck, waterproofing, protection components, and finished walking surface. A typical detail is useful only after its assumptions match the project. Arrange a mockup when several trades meet at a critical threshold, drain, guard base, or exposed edge.

Performance Evidence: Request It Rather Than Assume

Translate project needs into requests for current documented evidence. Depending on the application, that may include dimensions and tolerances, product weight, weathering or freeze-thaw data, wet-use information, relevant fire-performance documentation, and the proposed fastening or support-system information.

For each report offered, record the test method, tested product and version, test conditions, date, result, and relevance to the proposed assembly. A result for one product, finish, substrate, or laboratory condition should not be generalized to every project condition. If evidence is unavailable, leave the claim unverified and resolve whether the product remains suitable for the application.

Review Tanzite’s literature and ask a representative for current project-specific documentation. Do not infer the existence of a CAD detail, BIM object, certification, environmental declaration, or approved specification section from a marketing page.

Accessibility and walking surfaces where applicable

Where an accessible route is required, coordinate firmness, stability, slip resistance, openings, changes in level, and transitions with the applicable standards and authority. Request relevant walking-surface information for the proposed finish and installation condition. The U.S. Access Board’s floor and ground surfaces guide explains that its standards do not set one minimum coefficient of friction; a reported number must be understood in the context of its test method. A single slip result does not establish accessibility compliance.

Product Data, Samples, Mockups, and Closeout Submittals 

A stone deck board specification should identify what must be reviewed at design, construction, and closeout stages. CSI’s standards overview describes MasterFormat as a way to organize coordinated project documentation. The design team should select the appropriate location within its own specification set; this article does not assign a Tanzite section number.

Review current warranty information in writing, including exclusions and installation conditions. For appearance decisions, order physical samples and review them under the project’s expected light and weather exposure.

Architect’s Stone Decking Specification Checklist 

Use the checklist to close open decisions before issuing the final specification. Record the responsible discipline and drawing or submittal reference for each item.

For construction sequencing, the contractor installation guide can supplement the manufacturer’s current manuals. An early project estimate may help scope materials, but the project team must price the full structure, waterproofing, interfaces, labor, and access requirements.

Common Specification Errors

Avoid naming “stone decking” without identifying the collection and assembly. Do not assign waterproofing responsibility to the finish contractor by implication, or use a rain-through board detail over space that must remain dry.

Other avoidable errors include copying a generic span or load into the specification; treating a laboratory result as a universal performance claim; omitting guard, threshold, or drain details; and requiring documentation that has not been confirmed available. Review substitutions against the complete assembly, not appearance alone. Final decisions remain subject to local code, approved plans, the licensed project professionals, the waterproofing designer and manufacturer, and Tanzite’s current collection-specific instructions.

Need Product Documentation for a Stone Deck Specification?

Share the project type, substrate, whether the space below must stay dry, and the key edge and drainage conditions. Tanzite can help identify the appropriate collection and provide current product and installation resources for your design team to review. Final assembly design and project specification remain the responsibility of the qualified project professionals.

Compare Appalachian & Rainier · View Installation Guides · Talk to a Tanzite Representative

FAQs

Which Tanzite collection should an architect specify for a rain-through framed deck?

Start with Appalachian if the framing is suitable and water can safely drain below. Confirm the current board, fastener, support, and edge requirements against the Appalachian manual and the approved project design.

Can Appalachian keep an occupied space below the deck dry?

No. Appalachian is a rain-through board system; water passes between its boards. Protecting occupied space below requires a separately designed and coordinated waterproofing and drainage assembly.

Does Rainier replace the waterproof membrane on a rooftop or balcony?

Do not assume so. Rainier is the relevant Tanzite stone-flooring path for suitable waterproof assemblies, while the project still needs an appropriate substrate, waterproofing plan, drainage, protection, edges, and transitions.

What test evidence should a specifier request?

Request current evidence tied to the proposed product and use. Review the test method, product version, conditions, date, result, and relevance to the project before writing a performance requirement or accepting a claim.

Can stone decking be specified over an existing deck?

Possibly, after a qualified review of structure, condition, loads, movement, drainage, and the selected collection’s support requirements. A new surface does not correct rot, failed waterproofing, or unsafe railings.

What should the closeout package contain?

Request the approved product and finish record, applicable installation and care instructions, written warranty and exclusions, relevant inspection or testing records, and as-built information showing concealed drainage and waterproofing interfaces where applicable.