Glass Tabletops & Surfaces

For a glass dining tabletop, the thickness depends on the unsupported span between supports, not the overall size. A 6-foot table with two supports at the ends has a 6-foot span; the same table with a center pedestal has a 3-foot span on each side. The load capacity scales dramatically with thickness — doubling the thickness gives 8x the bending stiffness.

Guidelines we use, based on ASTM E1300 and IGMA recommendations for residential furniture: For a span up to 24", 3/8" annealed glass is sufficient for dining loads (40 psf live load). For a span 24-36", 1/2" is required. For 36-48", 3/4" is required. For spans over 48", we go to 3/4" tempered or 1" annealed, and over 60" we recommend a center support rather than just upsizing the glass.

Tempered glass at the same thickness has 4x the breakage strength but the same stiffness — so a 1/2" tempered top won't sag less than a 1/2" annealed top, but it's much safer if it does break (and we require tempered for any top installed in a residential location where breakage could cause injury, per ANSI Z97.1 and CPSC 16 CFR 1201).

Coffee tables and side tables have less stringent load requirements but the same span analysis applies. A 1/4" or 5/16" top is fine for most coffee tables up to 36" with proper edge support. Larger or pedestal-base coffee tables go to 3/8" or 1/2".

Flat polish: the simplest finish. The cut edge is ground smooth and polished to a clear satin finish. Visible cut marks are removed but the edge is square. Standard for most utilitarian tops, desk protectors, and budget projects. Adds about 15-20% to base glass cost.

Pencil polish (also called bullnose): the edge is rounded to a soft semi-circle profile, like the eraser end of a pencil. Smooth, comfortable to touch, visually softer than a flat edge. The most popular finish for residential dining and coffee table tops. Adds about 35-50% to base glass cost.

Beveled edge: the edge is ground at an angle (typically 1/2" wide at 22.5 degrees) before final polishing. Creates a prismatic light-catching effect at the perimeter. Common on traditional dining tables and conference tables. Adds about 50-75% to base glass cost.

Ogee edge: a complex S-curve profile that requires multiple-pass grinding on a CNC edger. Very high-end finish, common on traditional and formal furniture. Adds about 100-150% to base glass cost — but on a focal-point dining table it's worth the difference.

Mitered edge: two pieces of glass joined at a 45-degree mitered corner to create the appearance of a thicker top with a hollow interior. Used for floating-look conference tables and contemporary side tables. Specialty work, priced per job.

Hand-polished edges are the gold standard but most modern glass shops (including ours) use CNC edge machines that produce equally smooth results at a fraction of the labor. We hand-finish only for unusual profiles or for restoration work matching original hand-polished antique tops.

For a rectangular or simple round top sitting on a known base, we measure on the phone or from photos — width, depth, corner radius if any, edge finish, thickness. The customer signs off on a sketch before fabrication.

For an irregular shape — a kidney-shaped coffee table, a custom side table on a sculptural base, a dining table with rounded corners of unknown radius — we template on site. The standard approach is to lay heavy kraft paper or cardboard on the base, trace the perimeter, cut it out, verify it fits the base exactly, and bring the template back to the shop for layout.

For high-end or precision work — large conference tables with mitered corners, custom shapes for designer furniture — we use digital templating. A Faro laser or photogrammetry rig captures the base geometry to sub-millimeter accuracy and the CAD file goes directly to the CNC cutter. Adds about $200-400 to the project but eliminates fit issues on a $3,000-8,000 top.

Templating on-site visits are typically $75-150 depending on travel — credited against the order. We schedule these in batches when multiple jobs are in the same area.

Annealed glass is standard. Lower cost, smooth and clear, can be cut and edge-worked at any thickness. Breaks into sharp shards if struck — not appropriate for high-risk locations or per code for certain installations.

Tempered glass is heat-treated for 4x the breakage strength of annealed. Required by ANSI Z97.1 for any glass tabletop installed in a residential location where breakage could cause injury — which in practice means any dining table top or coffee table top accessible to children or in a high-traffic area. Has to be edge-worked before tempering — once tempered, the glass cannot be re-cut or re-polished.

Low-iron (Starphire, Optiwhite) glass has the green tint of standard glass removed for true clarity. Particularly noticeable on thick tops where the edge view shows the color — standard 3/4" glass has a distinctly green edge, low-iron 3/4" glass has a clear edge. Premium pricing (2-3x standard glass cost) but the visual difference is dramatic.

We default to tempered low-iron for dining tabletops over $1,000 in cost — the cost difference is small relative to the project and the result is dramatically better.

Most glass tops sit loose on the base, held in place by friction or by silicone bumpers (clear EPDM or PVC discs adhered to the underside at the contact points). The bumpers prevent the glass from sliding, dampen vibration, and isolate the glass from any wood movement in the base.

Permanent installations — restaurant tables, conference tables on wood credenzas — get a discreet silicone or rubber gasket at each contact point. Never use rigid construction adhesive — wood and glass have very different thermal expansion rates and the glass will eventually crack.

Care is straightforward: glass cleaner (ammonia-based for non-tinted glass, ammonia-free for tinted or coated glass) and a microfiber cloth. Don't use abrasive cleaners. Don't slide hot pans across the surface — thermal shock can crack annealed glass. Use trivets and coasters.

When a glass top breaks: clean up the shards (tempered breaks into small dull pebbles, annealed into large sharp shards), measure the existing base, and call us. We refabricate to the original template in 1-2 weeks for standard sizes and edge finishes.