Glass Railings in Greater Seattle

Glass railings are the one product on this list that is structural and life-safety code-governed at the same time as being architectural. A shower door that’s off by a sixteenth is a callback; a guardrail that’s under-anchored is a fall. The visual goal is an uninterrupted sightline, glass instead of pickets and light instead of a wall. The build itself is governed by panel thickness, glass type, anchorage, and the load the system has to survive. We do interior stair railings and exterior balcony and deck railings, in standoff/frameless, base-shoe, and framed post-and-clip configurations, and we detail every one to pass inspection in its jurisdiction.

Height and where a guard is required

The first thing that gets decided is height and whether a guard is even required. Building codes require a guard wherever a walking surface is roughly 30 inches or more above what’s below it. Residential one- and two-family work generally follows the IRC at a 36-inch minimum guard height; commercial, multifamily, and public work follows the IBC at 42 inches; and stair guards that double as the graspable handrail fall in the 34 to 38 inch band. Some jurisdictions amend these upward even for houses, so the governing number is whatever your local building department has adopted. Tim confirms that against the project before any glass is ordered.

Load and engineered glass

The load requirements are where frameless glass railings get engineered rather than just installed. A guard has to resist a 200-pound concentrated load applied in any direction at the top, plus a 50-pound-per-linear-foot uniform load along the top rail, and the glass infill has to take its own load without the differential deflection between two panels exceeding the glass thickness. In a framed system the posts and rail carry that; in a frameless standoff or base-shoe system the glass panel itself is the structural member, which drives both the thickness and the maximum panel width. This is why we size panels to an engineered system rather than eyeballing them. A frameless run that looks right and isn’t rated is a failed inspection at best.

Tempered vs laminated glass

Glass type is the other code-driven decision, and it’s the one homeowners are most often surprised by. Current codes push toward laminated glass for most guard applications. Laminated means two bonded plies with an interlayer that holds the panel together if it breaks, instead of monolithic tempered that lets go all at once. Washington’s residential code calls for a top rail or handrail on structural glass guards, supported so it stays in place if one panel fails, and its written exception is laminated glass. Building departments can also approve systems the code doesn’t spell out, and frameless tempered railings we’ve installed without a top rail have passed inspection. Which path your project takes depends on whether it’s interior or exterior, residential or commercial, and what the AHJ will sign off on. We spec the glass to that, not to whatever looks cleanest in isolation. Cost, safety and top rails are covered in more depth in the advantages and disadvantages of glass railings.

Interior stair railings

Stair railings are where the templating gets exacting. Each panel runs alongside the stringer with its angles cut to match the tread pitch, so the run is templated tread by tread rather than ordered to a nominal length. Most stair guards pair the glass with a wood or metal handrail at graspable height, and the guard and handrail requirements have to be coordinated so one assembly satisfies both. Standoff and base-shoe systems both work on stairs; which one is right depends on the stringer construction and how minimal the client wants the hardware to look. Multi-flight runs in three-story townhomes and custom homes are a regular part of this work. Floating stairs, handrails, and the choice between standoffs and spigots are covered on our stair glass railings page. We wrote up one finished job in floating staircase glass railings in a Clyde Hill home.

Exterior deck and balcony railings

Outside, the glass goes on standoffs fixed to the edge of the deck or balcony, or into a metal railing that holds the panels between posts or inside a frame. Every exterior rail and fitting we use is stainless steel or powder-coated stainless, chosen for Pacific Northwest rain and salt air near the Sound. Raised decks and balconies typically also need a permit and, often, engineered drawings. We detail to that requirement rather than discovering it at inspection. Mounts, photos and project details are on our deck glass railings and balcony glass railings pages.