When Glass Gets Installed, A Builder's Guide to Commercial Glazing Schedules

Glass is one of the last things to go into a commercial building, which means it sits directly between you and a certificate of occupancy. When it slips, everything behind it slips. We are Marvin and Susan of Stafford Glass Co., and after 35 years glazing commercial projects across Northern Virginia, here is how glass actually fits into a construction schedule and what keeps it off your critical path.

Where Glazing Falls in the Sequence

Commercial glazing is a late trade, and that is not an accident. The openings have to exist before anything can be measured. On a typical build the sequence runs framing, then exterior sheathing and weather barrier, then the storefront or curtain wall framing system goes in, then field measurement, then fabrication, then glass install. Interior partitions follow a similar pattern later in the build, after the walls are up and the floors are close to final. That means glass depends on four or five trades ahead of it finishing accurately and on time. Every day those trades slip is a day the glass cannot be measured, and measurement is what starts the clock on fabrication.

The Two Timelines That Actually Matter

There are two numbers a builder needs from a glazing contractor, and they are different. Lead time is how long the glass takes to fabricate after field measurement. For standard clear tempered storefront glass that is usually one to two weeks. Insulated units, laminated security glass, low-E coatings, and anything oversized or custom shaped run two to four weeks, sometimes longer depending on the supplier. Install duration is how long the crew is actually on site, and that is usually the smaller number, often one to three days for a storefront and one to two days for a run of interior partitions. Builders plan around install duration because it is the visible part. Lead time is what kills schedules, because it starts the day we measure, not the day you call.

What Actually Causes Glazing Delays

In our experience five things cause almost all of it. Openings that are not square or not the dimension on the drawing, which means the glass we fabricate to plan will not fit what was built. Field measurement scheduled too late, because the fabrication clock does not start until someone measures. Late specification changes, since a switch from clear to low-E or from annealed to tempered restarts the order. Substrate or anchoring problems discovered at install, where the framing cannot carry the load or the anchors were never blocked for. And access, when the site is not ready for a glass crew and a lift on the day we are scheduled. None of these are glass problems. All of them are coordination problems, which is why the glazier needs to be in the conversation earlier than most builders put them there.

How to Keep Glass Off Your Critical Path

Bring the glazier in at drawings, not at framing. We will flag opening sizes that are going to be a problem and specifications that carry long lead times while there is still time to change them. Field verify early and field verify for real, because we will not fabricate from drawings alone on a commercial job and neither should anyone else. Lock the glass specification before the order goes in, since a change after that resets the lead time to zero. Block and anchor for the glass during framing rather than discovering the problem on install day. And give the crew a realistic access window, because a glass crew that cannot get a lift to the opening is a crew standing around on your clock.

What Working With Us Looks Like

We field verify every commercial opening in person before anything is cut. You get a written schedule with the measurement date, the fabrication window, and the install date, not a range. Our custom glass fabrication is done in house, which means when a measurement comes back unusual we catch it at the bench instead of three weeks later when the piece arrives wrong. We coordinate directly with your superintendent and the trades on either side of us. And if something on our end slips, you hear it from us the day we know, not the week it was supposed to install.

Glass does not have to be the thing that holds up your closing. It usually only becomes that when it gets brought into the schedule too late to plan around. If you are building in Fredericksburg or anywhere in Northern Virginia and you want a glazing partner who works to your schedule rather than around it, we would be glad to talk. Request a free consultation and we will look at your drawings.