The Screen That Passed Every Check Except One
A borrowed light in a hospital corridor, roughly 1,200 by 900, glazed into a labelled hollow metal frame in a one-hour partition. The glass carried the right mark. The frame carried its own label. The schedule, the shop drawing and the delivery note all agreed. The glazier set the lite, found it moved a little in the pocket, packed the void at the jambs with hardwood offcuts, ran a bead of the general-purpose silicone that was already in the van around the perimeter and screwed the stops down until the movement stopped. It looked better than the openings either side of it, and the inspector failed it.
Nothing on that opening was substandard. Everything on it was unlisted. The void the glazier closed up is not manufacturing slack; it is the room the tested assembly needs when the frame on the fire side distorts, when the glass edge is being loaded by a steel section that has already gone soft, and when the hose stream arrives at the end of the burn and hits glass that has spent an hour at furnace temperature. Fill that void with a rigid packer and the glass is loaded in a way no specimen ever was. Fill it with an untested sealant and the products that were in the tested pocket are gone. Either change is the same class of change as swapping the glass, and the assembly no longer describes anything that was ever tested.
The rest of this article follows one opening from the schedule to the annual inspection: which of two fundamentally different ratings the specification is actually asking for, why the frame is the half of the assembly that carries the label, what belongs in the pocket, what the package weighs, how the frame meets the wall, and what has to still be legible on the glass in ten years. The arithmetic on the way is deliberately modest. Nothing here derives a rating, because ratings are not derived.
What a fire-rated glazed opening is made of
- Glazing bead or stop — the only removable part of the assembly, listed by profile and by fastener; a heavier substitute changes the pocket it closes
- Glazing tape or gasket — named in the listing as a product, not as a generic sealant, and priced by the perimeter of every lite on the job Glazing Gasket/Wedge Linear Footage Calculator
- The lite — carries no rating of its own; the mark in its corner records what the whole assembly did in a furnace on one date Structural Glass Panel Weight Calculator
- Setting blocks — hold the lite off the frame so the edge clearance survives being glazed, and their material is part of the listing Window Setting Block Count Calculator
- Labelled frame and glazing pocket — the labelled half of the assembly; the pocket depth and the edge clearance inside it are both figures from the listing Fire-Rated Glazing Typical Edge Clearance Reference
- The rated wall — sets what rating the opening has to reach and how much of that wall the glazing is allowed to occupy Multi-Layer Fire-Rated (Type X) Gypsum Sheet Calculator
Integrity Is Not Insulation
Two products can hold flame back for the same number of minutes and behave completely differently towards the person standing on the cool side. One holds the flame and the hot gas and lets radiated heat through almost unimpeded; a corridor wall glazed that way will ignite a notice board on the far side while the glass is still perfectly intact. The other holds flame, gas and heat, and stays cool enough to stand next to. The European classifications name the difference directly: E is integrity, I is insulation, and EI 60 promises both for an hour where E 60 promises only the first. EW sits between them, with the radiated heat measured at a set distance and held below the classification limit rather than eliminated.
The classifications come from a test and a classification document, not from a product description. BS EN 1364-1 covers non-loadbearing walls, BS EN 1364-3 covers curtain walling as a full configuration, and BS EN 1634-1 covers doors, shutters and openable windows; BS EN 13501-2 is what turns any of those test results into the EI 60 written on a drawing. The insulation criterion is a temperature rise on the unexposed face — commonly quoted as a mean rise of 140 K with 180 K permitted at any single point — measured on the specimen that was built, not on the glass considered alone. AS 1530.4 runs the equivalent tests in Australia and New Zealand, and BS 476-22 remains in circulation in the UK on older buildings and older specifications.
North America draws the same line with different vocabulary, and the vocabulary is where the money goes wrong. Fire-protection-rated glazing is an opening protective, tested by the door and window methods — NFPA 252 or UL 10B and UL 10C for doors, NFPA 257 or UL 9 for windows — and it makes no promise at all about radiant heat. Fire-resistance-rated glazing is tested as a wall, to ASTM E119 or UL 263, including the wall criteria for temperature rise on the unexposed face. The first is a hole in a barrier that has been protected. The second is part of the barrier. They look identical through a frame and they differ in price by a multiple, which is precisely why a submittal comes back with the cheaper one against a specification that needed the other.
That distinction also decides how much of the wall you may glaze. Current code editions cap the proportion of a fire partition or smoke barrier that fire-protection-rated glazing is allowed to occupy, and lift the cap where the glazing is fire-resistance-rated and tested as a wall — which is how an architect gets a fully glazed corridor and why the specification for it is written the expensive way. Read that limit off the edition your jurisdiction has actually adopted. The opening protectives provisions have moved between section numbers across code cycles, and quoting a number from memory is how a compliant screen gets redesigned twice.
One physical detail underneath all of it explains most of the product range. The hose stream that follows the fire exposure in NFPA 257, UL 9 and UL 10C is a thermal shock test wearing a mechanical costume, and ordinary glass does not survive being hit with cold water after an hour in a furnace. Glass-ceramic products survive it by having almost no thermal expansion to shock. Multi-ply intumescent laminates survive it by having already turned into an opaque foamed core that also happens to stop the radiation, which is why those products land on the insulation side of the line and the ceramics generally do not.
| Designation | Where the number comes from | What the cool side gets |
|---|---|---|
| E 30, E 60 — integrity | BS EN 1364 or 1634 test, classified to BS EN 13501-2 | Flame and hot gas held back; radiant heat passes almost freely |
| EW 30, EW 60 — limited radiation | Same tests, radiation measured at a set distance | Radiated heat capped below the classification limit for the period |
| EI 30, EI 60, EI 120 — with insulation | Same tests, temperature rise recorded on the unexposed face | Barrier performance; the surface stays approachable |
| Fire-protection rated | NFPA 252 or UL 10C for doors; NFPA 257 or UL 9 for windows | A protected opening in a barrier, with no radiant heat promise |
| Fire-resistance rated | ASTM E119 or UL 263, tested as a wall | Wall criteria, temperature rise on the unexposed face included |
| Smoke and draught control | UL 1784 air leakage test on the assembly | A leakage limit, which is a separate question from any of the above |
The Frame Is the Half That Carries the Label
A listing pairs one glazing product with one framing system, and the label goes on the frame because the frame is what was anchored, loaded and deflected in the test. Glass that is beyond reproach set into a frame that is merely made of steel gives an unrated opening, and hollow metal gets no free pass on that: the frame has to carry its own label for the rating and the configuration in front of you. On the aluminium side the point is sharper still, because the listed systems are engineered products rather than ordinary storefront sections, and setting rated glass into an unrated extrusion produces an assembly whose frame has lost most of its strength long before the test reaches its peak.
Frames also carry limits the glass schedule never mentions. The listing states a maximum exposed area per lite, and that permitted area shrinks as the rating rises until, on the highest-rated door leaves, it reaches zero and no vision panel is permitted at all. It states maximum overall assembly dimensions, which is a different limit from the per-lite one and the one that gets breached when a two-panel screen is redrawn as three. It states how the frame is anchored and what it is anchored into. An opening that grew 150 mm during coordination has left the listing in a direction that feels harmless and is not, because a larger lite delivers larger reactions into a frame nobody asked about.
Get the listing number itself onto the schedule, per opening, at tender rather than at delivery. Not the manufacturer, not the product family, the specific listed system covering that glass in that frame at that rating. Every downstream argument on this package — the clearance, the tape, the blocks, the beads, the maximum size, the anchorage — is settled by reading that one document, and it is the document that is hardest to obtain in the week the glass is due on site.
The Void Around the Lite Is Part of the Test
Three separate gaps get discussed as though they were one, and the confusion is not academic because the listed detail gives them separately. There is the space between the glass edge and the back of the pocket. There is the amount the stop laps across the face of the glass. There is the space between the glass face and the stop itself. Work out which of the three your detail is naming before comparing it to anything, and be especially careful when the word bite appears, because on site it is used loosely for at least two of them.
The reason a fire-rated pocket is generous has nothing to do with tolerance. Steel and aluminium sections on the fire side of a partition heat unevenly and bow, and the frame stops being the rectangle it was fitted as within minutes. The glass, meanwhile, is being asked to stay in one piece against a frame that is moving. A pocket sized to the listing lets the frame take up that movement without transferring it into the glass edge as a point load, and a lite that has been shimmed rigid at the jambs has no such release. Multi-ply intumescent products add a second reason: their edge seal is a working part of the assembly, and the pocket depth exists partly to keep that seal covered and out of ultraviolet light. Compress it, pierce it or expose it and the product ages differently from the one that was tested.
None of this can be recovered by calculation. There is no thermal-expansion sum that produces a listed edge clearance, and any page that offers one is inventing a formula for a figure that was set by observation in a furnace. What can be done from a drawing is a sanity check: put the glazing category and frame material into the reference below and see whether the shop drawing is anywhere near the range that combination normally sits in. A detail showing a couple of millimetres where the usual figure is closer to fifteen is worth an email while the frames are still in the factory.
Read the answer as a fraction rather than as a precision figure. The common values are quarter, three-eighths, half and five-eighths of an inch expressed in millimetres, so a result near 16 mm is five-eighths of an inch and not a millimetre-accurate requirement. The number that governs your opening is printed in your listing, and on an inspected job it is the listing and the label that get read, not a reference table.
A sanity check on a shop drawing before the frames are made, not a design value: pick the glazing category and the frame material and see whether the detail in front of you sits anywhere near the usual range for that pairing.
The fire-rated glazing product category.
The frame material the glazing is set into.
Typical listed edge clearance
0.37 in
This is a TYPICAL reference figure only, not a calculated or code-compliant value — fire-rated glazing edge clearance is set entirely by the specific tested and listed assembly (UL 9/UL 10B/UL 10C, NFPA 80/257). Always verify the exact bite/clearance against your specific product's UL listing and the manufacturer's installation instructions before installation; deviating from the tested clearance voids the fire rating.
They open the calculator with your figures already in it
Fire-Rated Glazing Typical Edge Clearance Reference: 0.374 in — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
Add the equipment this sizes
This result is a specification — 0.37 in — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.
What this calculation does not cover
- A fire rating is not an impact rating. Glazing in a door, a sidelite or any other hazardous location has to satisfy safety-glazing impact requirements as well, and traditional wired glass is where the two collide — it is weaker under impact than plain annealed glass of the same thickness, and its use in those locations has been restricted for years. Confirm the lite is listed for both before the edge clearance matters at all.
- One figure is returned for every lite size, and listings do not always work that way. A larger lite expands more, so a listing can give a different clearance band for a big lite than for a small one, and this page never asks how big the opening is. Read the size ranges in the listing before treating the figure as fixed.
Two Blocks, and Which Two
Setting blocks are what keep the edge clearance from quietly becoming zero along the bottom edge the moment the lite takes its own weight. Two of them, at roughly the quarter points, is the ordinary glazing convention and it holds here — but the listing has an opinion on both the count and the material, and on a fire-rated opening the material is the part that gets substituted without a thought. A block chosen for an ordinary window is chosen for hardness and compression set. A block in a listed fire assembly was in the furnace, and what it does at 600 degrees is part of why the assembly held.
Count them off the schedule rather than the drawing, because the quantity is small, cheap and the classic reason a glazing crew stops mid-morning. A fifty-lite screen package needs a hundred blocks of a named product, and the merchant does not stock it.
Blocks per lite times lites, which is arithmetic anybody can do and almost nobody does before the van is loaded — the useful part is doing it against the listed block type rather than whatever is in the glazing bag.
The total number of glass lites or windows to be set.
The number of setting blocks placed beneath each lite.
Total setting blocks needed
80 setting blocks
They open the calculator with your figures already in it
Window Setting Block Count Calculator: 80 setting blocks — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
What this calculation does not cover
- The result is a count, not a size and not a load check. Setting block length, width and hardness are chosen from the weight and area of the lite and the bearing stress the block can carry, and a block narrower than the full glass edge will load only one pane of an insulating unit instead of the spacer and both panes; none of that is tested by multiplying lites by blocks, and the dimensions and durometer come from the glass manufacturer's glazing instructions.
- A single blocks-per-lite figure is applied to every lite in the batch, and the input accepts only two to four. A mixed order in which the oversized lites take four blocks and the rest take two must be run as two separate calculations and the totals added, and a lite whose manufacturer calls for more than four blocks cannot be entered at all. The total is an exact product, with no spare blocks added for units dropped, cut wrong or lost on site.
- Nothing here positions the blocks. The quarter-point placement the calculation assumes, the edge clearance the block sets between glass and frame, and the rule that a block must never sit across a weep hole or dam the glazing pocket are all outside the count, and a correct quantity fitted in the wrong place still traps water against the edge seal.
- Only the blocks that carry the lite on its bottom edge are counted. Side blocks and anti-walk blocks on operable sashes, top blocking, and the shims and spacers used to centre the glass in the pocket are separate items and are not included in this total.
- Block material is not considered anywhere in the calculation. An elastomer incompatible with the glazing sealant can stain the edge seal of an insulating unit or inhibit the cure of structural silicone, so the compatible compound has to be specified from the sealant manufacturer's compatibility data independently of the quantity.
The Perimeter Nobody Prices
Glazing tape, wedge gasket and glazing compound are named in a fire listing the same way the glass is, and they are the line item that disappears from a takeoff because they feel like consumables. They are not consumables here. The tape that was in the tested pocket did a job in that pocket, and a general-purpose alternative from the van is an untested substitution made at the last possible moment by the person least likely to be asked about it.
Price the whole perimeter of every lite on the package in one go, with a corner allowance, and buy it against the listed product name. It is a short calculation and it turns a vague consumable into a purchase order line that has to be filled correctly, which is most of what protects it from being swapped.
Perimeter per lite across the lite count, with waste for corners and splices, so the tape arrives as a named product on a purchase order rather than as whatever the wholesaler had.
SettingsSettings for this calculation
Waste is set to 5% by hand. Pick a tier above to replace it, or keep your own figure.
The total number of individual glass lites to be gasketed.
The perimeter of a single glass lite (2 × (width + height)).
Extra material to allow for cut waste and splices.
Total gasket needed
315 ft
They open the calculator with your figures already in it
Glazing Gasket/Wedge Linear Footage Calculator: 315 ft — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
Estimated cost — your price
This site holds no price list for this material — local prices vary too much to publish honestly. Enter your supplier's price and the result is costed with it.
What this calculation does not cover
- The perimeter is taken exactly as entered — the calculator never sees the lite's width and height, so it cannot check that the figure is 2 × (width + height). Entering width plus height instead of the full perimeter halves the answer, and nothing on the page flags the error.
- One perimeter run is counted per lite. Glazing systems that carry both an inner and an outer gasket, or a wedge on one face with tape or a heel bead on the other, need two runs per lite, so either the perimeter or the lite count has to be doubled.
- Wedge gasket is meant to be cut slightly long and compressed into the pocket rather than stretched, because stretched material retracts and opens gaps at the corners. The waste allowance covers offcuts and splices, not that deliberate over-length: on 20 lites of 4.5 m the 5% allowance is 4.5 m, and cutting every leg 3% long consumes 2.7 m of it before a single offcut is made.
- The answer is a pooled length, not a buying quantity or a cut list. It does not know the supplied coil or roll length, so it neither rounds up to whole rolls nor accounts for the drop left at each roll end — 94.5 m (310 ft) bought in 30 m (98 ft) coils means four coils, and no single leg can bridge a coil end.
- This counts linear length only; it does not select a gasket profile. It says nothing about whether the wedge size suits the clearance between the glass edge and the frame rebate, or whether the resulting compression, edge cover and pocket depth meet the system's air and water penetration rating — an undersized wedge leaves the glass loose, an oversized one loads the glass edge.
Glass That Arrives Finished
Fire-rated glass-ceramic and multi-ply laminates are cut, edge-worked and sealed in the factory. They are not trimmed on the bench, they are not nibbled to fit a frame that came out 4 mm narrow, and on a multi-ply product the sealed edge is a component rather than a finish. A lite that measures wrong on delivery is a re-order and a lead time, not a morning with a grinder, and that single fact should change how the sizes are taken: measure the frames as built, not the openings as drawn, and take the sizes yourself if the programme allows it.
Weight is the other thing that arrives as a surprise. A multi-ply insulating lite reaches its rating partly through mass, so a screen drawn as ordinary glazing can come back at two or three times the weight the access plan assumed. Soda-lime glass runs about 2.5 kilograms per square metre for every millimetre of thickness, and the plies add up quickly on a 60- or 120-minute makeup. Run the panel size and the ply build-up before the lifting method, the route through the building and the storage are agreed, because the answer decides whether the lite goes in on two pairs of hands or on a vacuum lifter that needs a lift booking and a floor that will take it.
Handle storage as part of the same question. Stillages of heavy glass standing on a suspended slab are a temporary loading matter for whoever is responsible for the structure, and an intumescent laminate stored badly — edges exposed to standing water, faces in direct sun for weeks — can be damaged before it is ever glazed, in a way that does not show until it matters.
Panel size, single ply thickness and the number of plies — enter one ply and let it multiply, since the point of the exercise is to see how fast a multi-ply fire makeup outgrows the handling plan drawn for ordinary glazing.
The width of the glass panel.
The height of the glass panel.
The thickness of a single glass ply/lite, before lamination.
The number of glass layers laminated together in the panel.
Glass panel weight
230.8 lb
This calculates WEIGHT ONLY, for handling and rigging planning — it is NOT a structural adequacy calculator. Never select glass thickness or lamination for a load-bearing application (walkways, guards, floors) from this or any generic calculator — structural glass design requires ASTM E1300/E2751/E2752 and a licensed engineer using the specific manufacturer's certified glass strength data.
They open the calculator with your figures already in it
Structural Glass Panel Weight Calculator: 231 lb — shown in imperial, US market. The link sets both, so the result they see is the one on your screen.
What this calculation does not cover
- The panel weight is not the lifting weight, and a vacuum lifter's headline rating is not its rating for this pick. Add the lifter head, spreader beam, slings and any carrier frame into the gross load, then check the manufacturer's derating for the number of pads actually in contact and for the panel's ORIENTATION — a cup set rated at one figure with the glass horizontal is commonly rated far lower once it is tilted to vertical, which is the position it goes into the opening in.
- Weight tells you nothing about where it lands. All of that mass sits on two setting blocks, so the sill, lintel or slab edge underneath takes it as a pair of concentrated loads over a short bearing, and the head above has to hold a glazing deflection limit — typically on the order of span over 175 with an absolute cap — because a frame that sags onto the glass edge is what cracks the pane. Check the support, not just the glass.
Where the Frame Meets the Wall
An opening protective is only ever as good as the barrier it interrupts, and the junction between the two is a detail with its own listing. The void behind a hollow metal frame in a gypsum partition is filled the way the frame listing says it is filled, which on some systems means a specified mineral wool packing and on others means grout, and those are not interchangeable choices made by whoever is standing there. Anchors are part of it too: the type, the spacing and what they engage were all fixed by the test, and a frame held in with whatever fitted is a frame nobody has tested.
The wall itself needs the same attention because the rating of the opening cannot exceed the barrier it sits in and mean anything. A 60-minute screen in a partition that was built one board short is a 60-minute screen in a wall that will not last 60 minutes. Where the partition runs to a deck rather than a slab soffit, the head-of-wall joint has its own tested system with its own movement class, and it is the detail nearest the glazed screen that is most often left to the last trade on site.
Firestopping around service penetrations near a glazed opening belongs to the same family of decisions and to the same discipline: a tested system for that penetration, in that assembly, at that thickness. The related calculators below quantify those materials once the listed system is chosen. They do not choose it, and nothing on this site does.
It Has to Survive Being Owned
A fire-rated opening is one of the few things on a building with an ongoing legal life. NFPA 80 covers the installation and the periodic inspection of fire doors and other opening protectives, and it expects labels to remain legible and the assembly to remain as installed. That means the building owner inherits an obligation, and it means the handover pack is worth assembling properly on the day rather than reconstructing three years later from delivery notes.
The label is what everything hangs on. Painting over a frame label removes it as surely as grinding it off, and it happens on almost every refurbishment where a decorator meets a door frame. On the glass, the mark etched in a corner is the compressed version of the listing: a letter for whether it qualified in a door or a window, a letter for the hose stream, a letter for temperature rise, a letter for wall criteria, and the rating in minutes. It is the fastest check available on site and it is the one an inspector will make first.
Later trades are the main threat to a compliant screen. Applied film changes the glazing; so does a manifestation vinyl chosen for its appearance, an adhesive sign, a secondary glazing panel added for acoustics, a security grille fastened through the frame, or a cable clipped through the pocket. None of those look like alterations to a rated assembly to the person doing them, which is exactly why the handover pack has to say plainly, per opening, that it is one.
- Record the listing number, the rating and the classification against every opening on the schedule, at tender.
- Photograph the frame label and the glass mark before decoration reaches them.
- Check the beads, tape and blocks against the listed product names at first fix of the glazing, not at snagging.
- Confirm the void behind the frame was filled the way the frame listing states, while it is still open.
- Put the openings on the building owner's inspection register with the listing documents attached.
- Re-check the marks and labels at every subsequent refurbishment, because the trades that damage them arrive later than the ones that installed them.
| Mark | What the assembly demonstrated | What it still does not tell you |
|---|---|---|
| D | Qualified for use in a fire door assembly | Anything about the leaf, frame and hardware it was listed with |
| H | The door assembly was subjected to the hose stream test | That your opening reproduces the tested door |
| OH | Window assembly criteria, hose stream included | Whether the wall accepts a window of that area |
| T | Temperature rise on the unexposed face stayed under 450 °F for the first thirty minutes of the door test | Anything after that half hour — the criterion is a fixed thirty minutes whatever the rating in minutes says |
| W | Wall assembly criteria were met — fire-resistance rated glazing | That the framing and anchorage around it were tested the same way |
| A figure in minutes | The period the assembly held for | That the barrier around it holds for the same period |
The Wired Glass Already in the Building
Traditional wired glass is the reason a great many existing screens are a problem rather than an asset. The wire holds the pane together in a fire, which is what it is for, and it does nothing useful against a person walking into it — a wired lite breaks at a lower impact than plain annealed glass of the same thickness and leaves embedded wire in the opening. The exemption that once let it stand in a hazardous location on its fire rating alone has gone from current code editions, and a school corridor or a sports hall glazed that way is now a hazard with a rating rather than a compliant opening.
The remedies are not equivalent. A filmed or laminated wired product can meet the impact requirements of CPSC 16 CFR 1201 or ANSI Z97.1 while keeping a fire rating, and it is a legitimate product. Film applied on site to existing wired glass is a different thing entirely, and whether it is acceptable turns on whether that combination was tested and listed as an assembly and on what the authority having jurisdiction accepts — not on the film manufacturer's marketing. Replacement with a ceramic or multi-ply product that carries both the fire mark and the safety glazing mark is the clean answer and usually the more expensive one.
The survey question is worth asking early on any refurbishment of a building from the wired-glass era, because it changes the budget rather than the detail. Count the openings, note the rating each one has to reach, note which are in locations the safety glazing provisions treat as hazardous, and get that list priced before the rest of the scope hardens around the assumption that the existing screens stay.
What This Page Cannot Settle
Every figure worth having on a fire-rated opening comes out of a document about a specimen: a listing, a classification report, a manufacturer's installation instruction written to match them. This site can count blocks, price a perimeter, weigh a lite and show you the range a clearance usually sits in. It cannot tell you what your opening needs, because that answer was decided in a furnace before either of us saw the drawing, and the honest use of the arithmetic here is to make the questions you send back specific enough to be answered.
So the useful habit is narrow. Ask for the listing by number. Check the mark on the glass against it. Check the label on the frame against it. Check the pocket, the blocks, the tape and the beads against it. And when something on site does not match, treat it as a change to a tested assembly rather than as a detail to resolve locally, because that is what it is.
What to have in hand before the glass is ordered
The clearance reference hosts the workspace with the three quantity checks stacked under it. Everything in the list below has to come off the listing and the built frames rather than off the drawing, because those are the two documents that will still be true on the day the lites arrive.
- The listing number, per opening — Not the manufacturer and not the product family. The specific listed system covering that glass in that frame at that rating settles every other line here.
- Rating and classification, stated as both — Sixty minutes is not an answer on its own. EI 60 and E 60, or fire-resistance rated and fire-protection rated, are different purchases in the same wall.
- Sizes taken from the frames as built — Factory-finished lites are not trimmed on site, so a frame 4 mm out of the drawing is a re-order. Measure the frames, not the openings.
- Maximum exposed area and overall assembly size — Two separate limits in the listing, and the pair that a screen redrawn during coordination is most likely to have quietly breached.
- Blocks, tape, beads and fasteners by listed name — The pocket is a bill of materials. Anything substituted from the van is an untested change made at the last moment by the last person to be asked.
- Weight per lite and the route to the opening — A multi-ply makeup outgrows a two-person lift quickly. Settle the lifting method, the access route and the storage before the delivery is booked.
Opens the calculators above on one screen with the dimensions from this article already filled in. Quantities only — this site publishes no price list, because local prices vary too much to publish honestly.