Reading a glazing spec well means reading four documents, not one. The elevations and window schedule get you the framing and the glass, the part every bidder prices the same careful way. Everything that actually decides whether the bid is complete lives somewhere else: the hardware section, the structural general notes, and whichever trade's section happens to be fighting you over the curtain wall's slab edge.
1. The elevations and window schedule: the part everyone gets right
Aluminum entrances and storefront (framing, doors, glass and in-system hardware), curtain wall complete (system, anchors, glass, spandrels, in-system flashings, delegated engineering), aluminum windows by type and performance class, interior glazing, and window film. All of it reads straight off the elevations and the schedule, and every serious bidder prices it the same way. The one line worth double-checking even here: each window performance class carries its own cost, not just its own product code, so don't let a schedule with six similar-looking types collapse into one number.
2. The hardware section: where the entrance splits in two
Door hardware on an aluminum entrance is split between glazing and Division 8 more often than either bidder expects, and it's rarely split the same way twice — extract the ownership item by item rather than assuming last job's pattern holds. Automatic operators are usually the specialty-doors trade's where they're split out, but the door prep and power coordination for those operators still land here; find exactly where that line is drawn instead of treating the whole assembly as excluded.
3. The structural general notes: what actually prices the wall
Wind loads, deflection limits and thermal performance values pulled from the building's energy model price a curtain wall far more than the glass type printed next to the elevation does. Delegated design is a real cost, not a formality tacked onto the submittal. The same document usually settles glass railings and guards too: structural glass guard systems carry their own engineering duty, often shared with the misc metals trade rather than sitting entirely inside glazing, so extract who carries the engineering separately from who supplies and installs the glass and hardware. An unassigned engineering line on a structural glass system is not a small number to discover late.
4. Everyone else's section, read for your name in it
Safing at curtain wall slab edges is claimed by both sides of that boundary about as often as it's disclaimed by both. Glazing sometimes treats it as system continuity since it touches the anchors and mullions; firestopping sometimes treats it as someone else's wall. Whoever misses it is short real linear footage around the entire building perimeter, at every floor slab. Sloped glazing and skylight curbs carry the same problem with roofing: find the system with the specific detail of who flashes the curb, because both trades have a reasonable argument for why it's the other one's to run, and the drawings rarely settle it alone. And every interface flashing between cladding and glazing needs a named owner — an unassigned interface is where building envelopes actually fail.
What isn't yours, even sitting right in the opening
- HM and wood doors — the doors-and-hardware trade's scope. Glass installed in those doors follows whatever the documents actually state, not this trade by default just because it's glass.
- Panel and cladding systems — the cladding trade's scope, up to the interface flashing named above.
Costs that don't live on the window schedule
- Field testing and mockups. ASTM E1105 field water testing, performance mockups, and who pays when one fails and the system needs remediation and a retest.
- Glass lead times and substitutions. Coated glass and IGU lead times, bird-friendly frit on some institutional work, and how tightly the spec restricts substitutions once a submittal is underway.
- Warranty terms. IGU seal and finish warranties, and the gap between a whole-system warranty and a component warranty when different manufacturers supply different parts of the same wall.
Who you're sharing the wall with
| Trade | What to reconcile before you price |
|---|---|
| Cladding trade | Interface flashings and air barrier continuity at every jamb, head and sill — the boundary that fails first if it's left unassigned. |
| Specialty doors trade | Operator mounting and power coordination on auto-operated entrances. |
| Electrical trade | Power for operators and motorized shades within glazing systems. |
| General contractor | Hoisting and access, enclosure milestones, and protection of finished glazing during adjacent trade work. |
The read that actually matters
Elevations and schedule first, for the product. Then hardware section, structural general notes and whichever adjacent trade section touches your perimeter, for the split. Skip any of the four and the number is confidently wrong instead of honestly incomplete.