Writing Shower Specifications for Commercial Projects: A Spec Writer Guide

Shower enclosure specifications for commercial projects must be clear enough to be bid accurately, enforceable enough to ensure the installed product matches the design intent, and flexible enough to accommodate competitive bidding from multiple manufacturers. This guide provides a framework for writing specifications that achieve all three goals.

In commercial construction, the specification is the contractual document that defines what will be installed. A vague specification invites low bids that cut corners; an overly restrictive specification eliminates competition and increases cost. The best specifications define performance requirements clearly while leaving room for manufacturers to propose equivalent products.

A well-written specification prevents the most common commercial shower problems: mismatched finishes between phases of a project, hardware that does not meet the duty cycle of a commercial environment, glass that does not comply with the applicable safety standard, and warranty gaps that leave the building owner without recourse.

The specification writer's role is to translate the architect's design intent into technical requirements that can be manufactured, installed, inspected, and warranted. This requires knowledge of both the design objectives and the manufacturing reality.

Commercial specifications typically follow CSI (Construction Specifications Institute) MasterFormat division and section numbering. Shower enclosures fall under Division 08 (Openings), Section 08 81 00 (Glazed Entrances and Storefronts) or more specifically 08 85 00 (Glazed Curtain Walls) depending on the enclosure configuration. Learn more in our Shower Enclosures guide.

For most commercial shower projects, Section 08 81 00 is the appropriate home, with subsections covering the glass, hardware, seals, installation, and finishes. The specification should be organized in this sequence:

Part 1 — General: scope, applicable standards, submittal requirements, warranty

Part 2 — Products: glass, hardware, seals, frames, finishes

Part 3 — Execution: installation, inspection, cleaning, protection

Scope: Define clearly what the specification covers. Example: 'This section covers the design, manufacture, supply, and installation of tempered safety glass shower enclosures for guest room bathrooms in a 200-room hotel.'. Learn more in our Tempered Safety Glass guide.

Applicable standards: List every standard that the product and installation must comply with. For US commercial projects, the minimum is ANSI Z97.1 (safety glazing) and ASTM C1048 (tempered glass). For hospitality, add EN 14428 (enclosure performance) if the project follows European standards. Learn more in our Tempered Glass guide.

Submittal requirements: Specify what the manufacturer must submit for review before production. Typical submittals include product data sheets, glass certificates, hardware specifications, finish samples, and shop drawings. Set a review timeline (typically 10 business days) and define the consequences of late submittal.

Warranty: Specify the minimum warranty period and what it must cover. For commercial hospitality, a 5-year warranty on hardware and a 10-year warranty on glass are minimum expectations. Define what constitutes a warranty claim and the response timeline.

Glass specification: Specify the glass type (tempered safety glass), thickness (minimum 8 mm for frameless, minimum 6 mm for framed), standard (ANSI Z97.1 or EN 12600), and any special requirements (low-iron for extra clarity, factory coating for water repellency). Learn more in our Tempered Safety Glass guide.

Hardware specification: Specify the material (304 or 316 stainless steel for corrosion resistance), finish (chrome, PVD, or powder coat with specific color code), mechanism type (soft-close for pivot, concealed roller for sliding), and load rating (hinges must be rated for the specified glass weight with a safety factor of at least 2:1). Learn more in our Soft-Close guide.

Seal specification: Specify the seal type (magnetic, vinyl, or bulb), material (PVC or silicone), and performance rating (water containment at minimum 2 bar pressure).

Finish specification: Use specific manufacturer finish names or industry-standard color codes. Do not specify 'brushed nickel' without a reference sample — brush patterns vary significantly between manufacturers.

Configuration: Provide dimensions, panel layouts, door swing directions, and opening widths on the drawings. Include clearance dimensions for adjacent fixtures.

Installation: Specify that installation must follow the manufacturer's instructions and comply with applicable building codes. Require experienced installers and specify any special tools or techniques required.

Inspection: Define the inspection points: pre-installation (verify components match submittals), during installation (check alignment and sealing), and post-installation (verify operation and water containment).

Protection: Specify that installed enclosures must be protected from construction damage during the remainder of the project. Protective film on glass, cardboard on hardware, and restricted access during adjacent trades.

Cleaning: Specify the final cleaning requirements before owner acceptance, including removal of all protective films, cleaning of glass and hardware, and verification of drain performance.

Specifying a specific manufacturer by name: This limits competition and may violate public procurement rules. Instead, specify performance requirements and reference manufacturer names as 'or approved equal.'

Omitting the safety standard: Every shower enclosure must comply with the applicable safety glazing standard. Omitting this requirement from the specification leaves the manufacturer free to install non-compliant glass.

Vague finish specifications: 'Chrome finish' is insufficient. Specify 'chrome plating per ASTM B456, SC2 classification, minimum 0.25 micrometer thickness' or reference a specific manufacturer's finish with an approved-equal clause.

Ignoring maintenance access: Specify that hardware must be accessible for maintenance without removing the glass panels. This prevents designs that look elegant but require panel removal for roller adjustment or seal replacement.

Missing drainage specification: The shower drainage system is often specified in a separate plumbing section, but the enclosure specification should reference the drainage requirements to ensure coordination.

For a complete checklist of specification requirements, see our specification writing guide. Complete spec checklist

Before issuing a shower enclosure specification for bidding, verify that it includes:

1. Applicable standards listed and current (not superseded editions)

2. Glass type, thickness, and safety standard specified

3. Hardware material, finish, and load rating specified

4. Configuration dimensions on drawings

5. Seal type and performance specified

6. Warranty period and coverage defined

7. Submittal requirements and review timeline stated

8. Installation requirements referenced

9. Inspection points defined

10. Protection and cleaning requirements included