Frameless vs semi-frameless glass pool fence.

How each system is actually built

• Frameless — 12mm tempered panels anchored only at the deck via 316 stainless spigots (typically 2 per panel) or a continuous base shoe. Panels cantilever up. No vertical posts.
• Semi-frameless — 10mm tempered panels sitting between slim vertical posts (1½"–2" powder-coated aluminum or 316 stainless), post-fixed into the deck or surface-mounted with base plates.
• Both use the same tempered safety glass spec — ANSI Z97.1 / 16 CFR 1201 Cat II — so panel strength is identical per mm of thickness.
• Both use self-closing, self-latching gates with the latch release ≥54" above grade to meet Arizona / ISPSC code.

Installed cost in Arizona (2026 pricing)

• Frameless: $225–$260 per square foot installed
• Semi-frameless: $165–$210 per square foot installed
• 60' pool perimeter × 5' tall = 300 sq ft — frameless ~$67k–$78k · semi-frameless ~$50k–$63k
• Gate hardware is priced separately either way — expect $1,200–$2,400 per gate depending on hinge/latch spec
• Optional hydrophobic or ceramic coatings quoted per linear foot as a separate line item — not bundled into the base per-sqft price on either system

Deck engineering — the part most quotes skip

• Frameless spigots require a minimum 5" thick, 4,000 psi concrete deck with correct edge distance from the panel to the pool coping. On existing decks, we core-drill and epoxy; on new pours, we set anchor sleeves before the pour.
• Frameless base shoe (continuous track) needs an even more precise deck plane — anywhere the finished concrete varies more than ⅛" over 4', the shoe has to be shimmed, which shows.
• Semi-frameless posts spread the wind load across multiple anchor points, so a 4" deck at 3,500 psi is enough for most residential runs. Thinner or older decks can usually take semi-frameless without a rebuild.
• If your deck is stamped concrete, travertine over sand-set, or older pool decking with cracking, semi-frameless is often the only glass option that doesn't require tearing out and repouring.

Wind, monsoons, and the anchor question

The glass isn't what fails in a monsoon — the anchor is. Frameless puts every pound of wind load into 2 spigots per panel, which is why the deck spec is non-negotiable. Semi-frameless distributes that load across posts, so the failure envelope is wider and more forgiving of substrate imperfections. On sites we engineer for Peoria/Anthem foothills where funneled wind matters, we spec closer post spacing on semi-frameless or thicker (½"/12mm) glass on frameless — either works, they're different engineering paths to the same load rating.

View — the reason people choose glass in the first place

• Frameless: uninterrupted. From inside the house, the eye reads pool → deck → mountain as one plane. No visual break.
• Semi-frameless: a rhythm of vertical posts every 4'–6'. Much less than wrought iron, but the eye still catches them, especially at low sun angles.
• From outside the pool: frameless disappears; semi-frameless still reads as 'a fence' at a glance
• Photographs of the yard: frameless is invisible in the shot; semi-frameless posts show up in every angle

Calcium, hard water, and Arizona-specific hardware wear

• Phoenix tap water is hard — 12–17 grains, high silica — so any hardware sitting at splash height will spot
• Frameless spigots and base shoe are 316 stainless. They pit sooner than most people expect if they never get rinsed, and calcium spotting shows on the polished finish within a season.
• Semi-frameless posts are usually powder-coated aluminum, which hides calcium better and doesn't pit — the powder coat itself lasts 15–20 years in Arizona sun before it starts fading on south/west exposures
• Both benefit from hydrophobic or ceramic coating on the glass; the coating is more critical on frameless because there's more exposed glass surface with no post to break the sheeting pattern
• Real-world maintenance: frameless wants a rinse + squeegee at least monthly; semi-frameless tolerates a lazier cadence

Code, safety, and inspection notes

• Both meet ARS §36-1681 and the locally-adopted ISPSC pool barrier code at 5' overall height
• Under-panel gap: 4" max over hard mow strip or concrete, 2" max over turf or pavers without a continuous hard edge — semi-frameless posts make this easier to hit consistently because you can shim the panel independently of the deck plane
• Self-closing hinges and self-latching gates with latch release ≥54" off the ground — same requirement, same hardware selection on both systems
• Tempered safety glass is more impact-resistant than most homeowners assume — a picket iron fence is easier to climb than any glass panel of either system
• Neither system replaces an alarm, cover, or supervision — code is a floor, not a ceiling

When semi-frameless is honestly the right call

• Existing pool deck that isn't thick enough or clean enough for frameless anchor spec
• Long straight run along a side yard or return wall where the view doesn't matter
• Budget forces glass on part of the perimeter and iron/aluminum on the rest — semi-frameless matches better with mixed metal hardware
• HOA has approved semi-frameless in the neighborhood but hasn't blessed frameless yet

When frameless is worth every dollar

• Pool faces a mountain, golf course, city lights, or a designed landscape you paid for
• Long-term hold — you want to install it once and stop thinking about it
• The rest of the yard is finished to the same level: pavers, lighting, kitchen, landscape — semi-frameless posts read as the weak link visually
• Resale in a market that rewards finished outdoor space — Scottsdale, Paradise Valley, DC Ranch, Silverleaf, Desert Mountain, Estancia