Two Items Circled on the Same Submittal
Sixty pages come back from the glazing subcontractor and fifty-five of them are product literature. Two items carry the risk. One is a structural glass guard along a mezzanine edge, submitted as a makeup and a base shoe with no calculation behind either. The other is a run of windows on the street elevation that the security brief describes only as reaching a stated protection level under blast — no product named, no threat restated, just a level and an expectation that somebody downstream will check it.
Those two lines are specified differently from everything else in the package, and that difference decides how they are reviewed. A prescriptive line — 12 mm fully tempered, clear, polished edges — is checked by looking: the schedule says one thing, the shop drawing says the same thing or it does not. A performance line names an outcome instead, and an outcome can only be checked by finding the document that recorded it and then proving that the document is about the thing being delivered to this building. Most of the work in a glazing review is that second half, and most of the errors live there too.
What follows takes both items to a conclusion. The guard resolves into a stress figure and a comparison the code puts a factor of four in front of; the windows resolve into a rating already established in a laboratory, which the reviewer either accepts or rejects but never derives. Both have a number this site can produce, and both have a point past which the number stops being evidence. Naming that point is the useful part.
A Rating Is Something One Specimen Did, Once
Performance ratings behave nothing like material properties. A density belongs to glass everywhere; a hazard rating belongs to a specimen that was built to a drawing, mounted in a particular frame, anchored to a particular reaction structure and loaded once, in a laboratory, on a date. The report names all of it — makeup and ply thicknesses, interlayer type and thickness, overall glazed dimensions, edge bite, glazing method, frame section, fixings and their spacing, and the loading applied. Everything outside that description is untested, and untested is not a mild condition when the requirement exists because somebody expects an explosion or a fall.
This is why a mark etched into a corner of a pane and a certificate in a submittal are not the same species of evidence. Safety glazing impact classification does travel with the product, because the impact test is run on the glazing material itself: the pane is permanently marked with the manufacturer, the type and the standard it was tested to, and the code's identification requirement in Chapter 24 exists so an inspector can read that mark years later without any paperwork. An assembly rating cannot be etched on anything, because the glass is only one part of what was tested.
Substitution is where assembly ratings quietly die. Glass upgraded to something demonstrably stronger, set in a lighter frame, is a different assembly. The same window anchored into a stud backup rather than the reaction frame it was tested against is a different assembly. An opening larger than the tested specimen is a different assembly, and the direction of the difference does not save it — a bigger lite delivers larger reactions into a frame that was never asked for them. Ask three questions of every performance certificate: whose product is it, what exactly was built, and what was it subjected to. Reports issued to an associated brand, or dated before a profile change the manufacturer now advertises, fail the first question before the numbers are ever reached.
The same discipline covers the ratings this article does not follow to a conclusion. Windborne-debris approvals rest on the missile impact and cyclic pressure regime of ASTM E1886 and the specification in ASTM E1996; sound ratings come from a laboratory sound transmission loss measurement to ASTM E90, classified by ASTM E413, on a specimen sealed into a test opening in a way no site ever reproduces; thermal figures are simulated and certified under NFRC 100 and NFRC 200 at standard sizes. Each is a real number about a real specimen and none of them is a property of the glass on its own.
| Requirement in the spec | What produces the number | What the number belongs to |
|---|---|---|
| Safety glazing in a hazardous location | Impact test to CPSC 16 CFR 1201, or ANSI Z97.1 | The glazing material, permanently marked on the pane |
| Guard resisting the code line load | Engineering to the code loads, plus full-scale testing to ASTM E2358 | The panel, its clamp and its fixing into the structure |
| Glass under design wind pressure | The load resistance procedure of ASTM E1300 | One lite at a stated size, support condition and breakage probability |
| Blast protection level | Test to ASTM F1642, GSA-TS01, ISO 16933 or ISO 16934 | The complete glazed assembly at one pressure and impulse pair |
| Fire-rated opening or wall | Listing under NFPA 252, NFPA 257, UL 9, UL 10C or ASTM E119 | The listed assembly, in the frame and hardware it was listed with |
| Air, water and structural on a window | Rating to AAMA/WDMA/CSA 101/I.S.2/A440 | A product line at a tested size and performance grade |
The Mezzanine Guard, and What 0.73 Kilonewtons Per Metre Puts Into the Glass
Start with the load, because it is the one part of this item nobody gets to negotiate. A guard has to resist a horizontal line load applied along its top — 50 pounds per linear foot, 0.73 kN/m, 0.73 newtons per millimetre, all the same number in different clothes — under Section 1607.8 of the International Building Code as adopted and amended locally, with a concentrated load required in the same section and applied separately. The distributed load usually governs the panel; the concentrated load matters at a free vertical edge, at the top of a fin, and anywhere a cap rail stops. Both belong in the review, and a submitted calculation that quietly addresses only one of them is incomplete rather than wrong.
The screening check treats a unit-width strip of the panel as a cantilever from the line where the clamp grips it. The moment is the line load times the height of the arm, the elastic section modulus of a strip of thickness t is t squared over six, and the stress falls straight out as six times the moment over t squared. That is why thickness dominates the answer so violently: the moment grows in proportion to the height while the resistance grows with the square of the thickness, so three millimetres of extra glass moves the result further than a hundred millimetres of extra height.
The arm is the input most often taken from the wrong place. It runs from the top of the grip to the line the load is applied on — the top of the panel where there is no cap rail, the centreline of the rail where there is one. A recessed base shoe whose resin or wedge pack tops out below the finished floor gives an arm longer than the visible panel, and taking the height off the setting-out drawing as floor-to-top-of-glass understates the moment in exactly the direction that flatters the result. Measure from the shop drawing's section, not the elevation.
Laminated makeups need one more step before a thickness goes in the box. Two 10 mm plies bonded by a 1.52 mm interlayer are not a 20 mm monolith and are not two independent 10 mm sheets either; they land somewhere between, at a position set by how much shear the interlayer transfers. ASTM E1300 sets out the effective-thickness treatment that converts a laminated build-up into a single equivalent thickness, and the result moves with temperature and load duration because the interlayer's shear stiffness does. A stiff ionoplast on a north elevation in winter and the same product on a west-facing atrium guard in August give two different effective thicknesses, and the warm case is the one to check.
None of that touches what happens after the glass breaks, which is the question the code is really asking of a guard. ASTM E2358 covers full-scale performance of glass in permanent railing systems — structural load and deflection, a safety-factor hold, impact, and behaviour once the panel is broken — and Section 2407 requires the guard to stay in place when a panel fails, whether through a continuous cap rail, support by multiple balusters, or the laminated-panel routes the section permits. Fully tempered glass adds its own reason to care: nickel sulfide inclusions can break a toughened panel years after installation with no impact at all, which is why heat-soak testing to EN 14179-1 appears in specifications and why an unlaminated tempered guard over an occupied floor is a hard sell in any jurisdiction.
What actually resists the line load on a glass guard
- Cap rail — ties the panels into one line and holds a broken panel in place; where the code permits its omission, the laminated makeup underneath is doing that job instead
- Laminated glass panel — cantilevers from the top of the grip and takes the whole line load in bending, at a stiffness set by the interlayer rather than by the sum of the plies Glass Balustrade Bending Stress Checker
- Wedge and resin pack — sets the real cantilever start, which sits at the top of the grip and not at the finished floor the elevation was dimensioned from
- Base shoe — carries the panel's dead weight and turns its bending moment into a couple through two rows of fixings, so its rotation adds to the deflection at the top Architectural Glass Weight Calculator
- Slab or supporting structure — the last element in the chain and the one least often checked, since a guard fixing pulls at a slab edge where reinforcement and cover are already crowded
With the arm measured from the top of the grip and the laminated makeup reduced to an effective thickness, this puts the code line load through the panel and returns the bending stress the rest of the review argues about.
The horizontal line load applied at the top rail, per unit width of guard.
The height from the glass's base fixing (where it's clamped/embedded) up to where the line load is applied at the top rail.
The nominal thickness of the glass panel (or effective thickness for laminated glass).
Calculated bending stress
4,100 psi
This is a simplified cantilever screening check only, not a substitute for the full-scale ASTM E2358 testing (structural load/deflection, safety-factor hold, and impact/post-breakage behavior) and the IBC-required minimum safety factor of 4 against glass breaking strength that a complete glass balustrade design requires.
- Bending moment per unit width
- 19,309.64 n·mm/in
They open the calculator with your figures already in it
Glass Balustrade Bending Stress Checker: 4,102 psi — 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 — 4,100 psi — 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
- The thickness field takes one number and a laminate does not have one. How much of the section actually works depends on the shear the interlayer transfers, and that falls with temperature and with how long the load sits there — a PVB laminate on a hot facade under a sustained crowd load drifts toward two plies acting independently, a fraction of the stiffness that entering the summed thickness implies. Effective thickness comes from the EN 16612 or ASTM E1300 laminate procedure at the design temperature and duration, not from adding plies together.
- Deflection is what usually governs and it is not calculated here. A cantilever guard is normally limited at the top — commonly on the order of the height divided by 65, or an absolute cap around 25 mm (1 in) — and a panel with entirely acceptable bending stress can still swing far enough to alarm whoever leans on it and to fail that limit outright. Stress and deflection are separate checks, and deflection is the harder of the two to pass on a tall frameless panel.
- The moment computed above does not stop at the glass; the base fixing carries every bit of it. A spigot pair, a clamped channel or a resin-set pocket has to develop that same moment plus the eccentricity between the load line and the anchor group, then pass it into the slab edge or stringer beneath. That is where these guards actually fail — the glass is rarely the weak part.
- One load case, and others regularly beat it. The uniform line load is only one of the guard loads: a concentrated load applied at any point along the rail is checked on its own, an infill load applies across the panel face, and on an exposed balcony or a high-level terrace the wind pressure frequently exceeds the 50 plf line load altogether. Run each case separately and design to the worst of them.
The Allowable Nobody Prints on the Drawing
A stress in megapascals settles nothing on its own, and glass is unusually awkward about what it should be compared against. Its strength is not a material constant but a function of surface flaws, so nominally identical panes break at different loads and the honest description of strength is a probability. ASTM E1300 works in exactly that currency — load resistance at a stated probability of breakage, for a stated duration — rather than in a single allowable stress a reviewer could keep in their head.
Two variables move the comparison more than anything else. Glass type is the first: heat treatment leaves the surface in residual compression, and the difference between annealed and fully tempered runs to roughly a factor of four, with heat-strengthened between them. Load duration is the second, since glass fails by slow crack growth and tolerates a gust far better than a permanent load. A guard's line load is neither a three-second wind event nor a dead load, and the duration assumed for the allowable has to be stated alongside it or the comparison is unreproducible.
Then the code puts its own multiplier on top. Section 2407.1.1 requires a minimum safety factor of four against the breaking strength of the glass for panels in handrails and guards — which is not the same exercise as staying under an allowable stress, and not something a cantilever strip calculation demonstrates. Treat the screening figure for what it is: a way of finding out, in a minute rather than a fortnight, whether the submitted makeup is in the right region before anyone commissions the full-scale testing that will actually close the item out.
Reading the Blast Report Past Its Cover Page
The security brief asks for a stated GSA performance condition, and a condition number on its own is half a sentence. The other half is what the specimen was subjected to when it earned that number: a charge weight at a standoff distance, or, more usefully for a reviewer, the recorded peak positive pressure and impulse the glazing actually saw. The same window can rate near the top of the scale against a modest, distant threat and near the bottom against a closer one. A submittal that offers a condition without its pressure-impulse pair has not yet made a claim that can be checked.
The scale itself has to be read carefully, because it runs the opposite way to intuition. On the GSA and ISC conditions, 1 is the best outcome and 5 the worst, so a glazing passes when its achieved number is at or below the required one. ASTM F1642 reports hazard ratings by name rather than number, from no break through to hazard; ISO 16933 classifies arena tests and ISO 16934 shock-tube tests, and EN 13541 classifies resistance to explosion pressure on a different basis again. Results from these methods are not line-for-line interchangeable. Where the specification names one scale and the report answers on another, that is a deviation requiring a written justification from a blast consultant, not a mental conversion by whoever is holding the pen.
Three routes lead to blast-resistant glazing and they finish in different places. ASTM F2248 converts a charge weight and standoff into an equivalent three-second design load, which is then taken through ASTM E1300 to size laminated glass — an analytical route, and the one behind a great many specified makeups. The dynamic route models the assembly's response directly with single-degree-of-freedom or finite-element software under UFC 3-340-02, which is where pressure-impulse diagrams and rebound actually come from. The test route builds the assembly and blows it up under ASTM F1642 or the specification in ASTM F2912. Only the third produces a hazard rating, and a specification asking for a rating has therefore asked for a test.
Reports on glass alone are the commonest thing offered in place of what was asked for. Blast performance is a property of the whole opening: the laminated makeup, the bite holding it, the sealant and its adhesion, the frame section, the anchors and the substrate they engage. The design principle running through ASTM F2248 and the DoD antiterrorism criteria is deliberately unbalanced in one direction — the glazing is meant to be the weakest element, so that frame and anchorage develop the glass's own capacity rather than failing first and throwing the whole panel into the room. Rebound after the positive phase frequently governs those anchors, which is why the fixing schedule on a blast window looks excessive next to an identical-looking commercial window.
Match the specimen to the project item by item, because this is where an accepted rating turns out to have been about something else. Overall glazed size against the largest opening on the elevation. Edge bite and glazing method against the shop drawing section, wet-glazed silicone included. Frame profile, wall thickness and alloy. Anchor type, size and spacing, and above all the substrate the test frame was fixed to — laboratory reaction structures are stiff, and a light-gauge backup or a masonry infill is not. Operable vents and their hardware, which are their own tested assembly and not covered by a fixed-light report.
Only once all that lines up is there anything worth comparing. The check below does nothing but hold an achieved condition against a required one and say whether it clears; it computes no pressures, no impulse, no dynamic response, and it cannot tell you whether the report in front of you belongs to the window being supplied. Those judgements are the review. The comparison is just the last five seconds of it.
- Write the threat the report was run at — charge weight and standoff, or measured peak pressure and impulse — beside the threat the project brief states.
- Confirm the test method named on the report is the one the specification asked for, and note which rating scale it answers on.
- Check the specimen's glass makeup, interlayer type and thickness, overall size and edge bite line by line against the shop drawing.
- Confirm the frame section, the anchors and the substrate the specimen was fixed to match the wall actually being built.
- Confirm the laboratory's accreditation, the report date, and that the report identifies the manufacturer supplying this project.
- Only then compare the achieved performance condition against the required one, and record both on the review sheet.
Once the report has been matched to the opening, the last step is arithmetic on an inverted scale where a lower number is better — worth doing deliberately, because reading it the wrong way round is a mistake that looks like a pass.
The GSA performance condition already established for this glazing assembly by independent ASTM F1642 testing.
The minimum GSA performance condition the project's blast design criteria call for.
Achieved GSA performance condition
2 GSA Condition
The glazing's published performance condition is at or above the project's requirement on the GSA/ASTM F1642 scale. Being on the right side of that comparison is not a blast design: this compares two published, independently-tested ratings and computes no blast pressure, impulse load or dynamic rebound response of its own. That work is done in SDOF or finite-element software per UFC 3-340-02 and ASTM F2248, by a qualified blast engineer.
- Required condition
- 3 GSA Condition
They open the calculator with your figures already in it
Blast-Resistant Fenestration Rating Checker: 2 GSA Condition — 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
- A performance condition is inseparable from the blast it was earned against. ASTM F1642 ratings come out of a shock tube or an arena test at a stated peak pressure and impulse, standing in for a particular charge at a particular standoff, so the same glass at half that standoff is a different result. Matching condition numbers without matching the pressure and impulse behind them is not a comparison.
- The rating belongs to the tested assembly, not to the glass. The frame, the bite into it, the structural silicone or gasket, and the anchors back into the structure were all part of the specimen — swap any of them and the certificate no longer applies. Laminated glass that holds together in a frame that tears out of the wall puts the whole panel into the room.
- The scale is written in terms of where fragments land, measured against a witness panel a set distance behind the opening. That makes one condition mean different things in different rooms: the rating that is comfortable across a deep lobby is a different proposition in a narrow corridor, or anywhere a desk sits hard against the glass line.
Fire Is in the Same Package, and That Rating Is a Listing
Glazing in a rated wall or a rated opening obeys a third logic again, and one distinction causes more submittal churn than everything else in Chapter 7 combined. Fire-protection-rated glazing is an opening protective: it is tested to the door and window methods of NFPA 252, NFPA 257, UL 9 or UL 10C, it is limited in the area it may occupy in certain walls, and it is not a substitute for the wall. Fire-resistance-rated glazing is tested as a wall, to ASTM E119 or its UL equivalent, including the temperature-rise criteria, and it can be used where the wall's rating has to be maintained. The two products look identical through a frame and cost very differently, which is precisely why one gets submitted for the other.
The marking settles it. The code's marking table requires a permanent identification on each piece that encodes whether it was tested as a door assembly or as something other than a door, whether the hose stream test was included, whether temperature rise across the assembly is limited, and the duration in minutes. That short code is the listing compressed onto a corner of the glass, and it is the fastest check available on a fire submittal — faster than opening the listing itself, which is where you go next when the mark and the schedule disagree.
Installation is part of the listing too, not a trade decision afterwards. Edge clearance, glazing tape, setting blocks, glazing compound, frame reinforcement and the maximum exposed area all come from the listed assembly, and NFPA 80 governs the installation and the labels that have to survive on it. Fire-rated ceramic and multi-ply products cannot be cut on site, so a lite that arrives long is a replacement rather than a trim. The reference below gives typical listed clearance ranges for common product and frame combinations — useful for sanity-checking a shop drawing before the listing arrives, and never a substitute for the listing itself.
Edge clearance on a fire-rated lite is not a calculable thermal allowance but a figure from the listed assembly, so this reference exists to flag a shop drawing that is nowhere near the usual range while there is still time to ask for the listing.
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.
What the Upgrade Weighs, and Who Finds Out Last
Every performance requirement in this article arrives, eventually, as thickness. A guard that started as a 12 mm monolithic panel comes back as a 21.5 mm laminated build-up. A window that was a conventional insulating unit comes back with a laminated inboard lite and a heavier interlayer to reach its hazard rating. Soda-lime float glass runs about 2,500 kilograms per cubic metre, which is a convenient 2.5 kilograms per square metre for every millimetre of glass, so the arithmetic of an upgrade is unforgiving and entirely predictable: doubling the glass doubles the mass of the largest component in the assembly.
That extra mass lands on parts of the job the glazing package does not own. The base shoe and its anchors take it at the guard. Hinges, stays and operators take it on every vent, and hardware rated for the original unit will not carry the new one. Lintels, mullions and the slab edge at a guard line take it permanently. The lifting plant takes it once, which is the moment it becomes visible — a panel a two-person crew could set at the old makeup needs a vacuum lifter and access for it at the new one, and that changes the programme, not just the risk assessment. Stillages of heavier glass standing on a suspended slab are a temporary loading question for the structural engineer rather than an operational detail.
The knock-ons run sideways into the other performance lines as well. A heavier laminated makeup shifts the acoustic result, changes the centre-of-glass thermal performance and the whole-window U-factor, alters the visible transmittance, and can push a unit past the size the fabricator's warranty covers for that build-up. Any of those may be a benefit; none of them may be assumed. The schedule that carried an acoustic figure and a thermal figure against the original makeup has to be reissued against the new one, and the reviewer who accepts the blast upgrade without asking for that reissue has approved a window nobody has fully described.
Put the new makeup's combined glass thickness and the largest panel size through this before the hardware, the lifting method and the temporary storage are signed off, since the weight is what turns a specification change into a programme change.
The total face area of the glass panel.
The nominal thickness of the glass panel.
The glass material's density.
Glass panel weight
162.3 lb
They open the calculator with your figures already in it
Architectural Glass Weight Calculator: 162 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
- Area and a single thickness are the only geometry in the arithmetic, so drilled holes, patch-fitting cut-outs and notched corners are still counted as solid glass and the panel comes out heavier here than it does on the weighbridge.
- The thickness field accepts 3 mm (0.12 in) to 25 mm (1 in), which covers one lite or a modest two-ply laminate; a heavier build-up such as three 12 mm (0.47 in) plies exceeds that ceiling, so each ply has to be run separately and the answers added together.
- Nothing but glass is weighed — the PVB or other interlayer, a sealed unit's spacer bar and desiccant, gaskets, glazing beads and framing all sit outside the formula, so a finished assembly arrives on site heavier than the figure shown.
- Density is confined to the 2400–2600 kg/m³ (150 – 162 pcf) soda-lime float band, so a specialty glass whose density falls outside that range cannot be entered and its weight has to come from the manufacturer's own data sheet.
- Panel area is limited to 30 m² (323 ft²), and the answer is the glass by itself: the stillage or A-frame, the crate and the vacuum lifter's own mass all still have to be added before a load is matched against a crane or lifter rating.
Marking the Submittal So the Next Person Can Follow It
A review stamp is a statement about conformance with the design intent, not a re-design and not an assumption of the specialist's engineering responsibility. What makes it defensible years later is specificity: which document proved which line. Test report number and date against the blast item. Listing number against the fire item. Calculation reference, revision and the engineer's seal against the guard, together with the assumptions that calculation ran on — the arm, the effective thickness, the glass type, the load duration and the allowable used.
Handle the equivalence claim with particular care, because it is where an assembly rating is most often lost in good faith. A product offered as equal to a specified one is making a claim about an outcome, and the evidence for that claim is a test report on the offered product, not a comparison table on a letterhead. Where a substitution changes any part of the tested arrangement — glass, interlayer, bite, frame, anchor, substrate — it has produced a new assembly, and a new assembly needs its own evidence or its own analysis. 'Or equal' is a procurement phrase; laboratories do not recognise it.
Two categories of comment are worth separating in the response so the next reviewer inherits a clear picture. The first is missing evidence: a rating asserted with no report attached, a report attached for a different size, a listing referenced but not supplied. The second is a genuine deviation, where the evidence exists and does not reach the requirement — and that one belongs in the deviation register with a named person to close it, not in a mark-up somebody may or may not read.
Say plainly, in the response, which figures were screening. The bending stress on this page is a cantilever strip check that ignores two-way action, torsion at the free edge, clamp rotation and everything that happens after the glass cracks; the blast comparison is arithmetic performed on two numbers other people established. Both are good for deciding what to ask for next. Neither approves anything, and writing that down is what keeps the reviewer's own file honest when the file is the only thing left.
On the desk before the stamp goes on
The guard opens the workspace, with the blast comparison and the weight check stacked under it — everything below is what has to be in front of you before any of those three numbers means anything.
- The section, not the elevation — The cantilever arm runs from the top of the grip to the load line. A recessed shoe makes it longer than the visible panel height, and that difference flatters the answer.
- The makeup as an effective thickness — Ply thicknesses, interlayer type and thickness, and the temperature and load duration the effective thickness was derived at — not the nominal sum of the plies.
- Glass type, allowable and duration — Annealed, heat-strengthened or fully tempered changes the comparison by roughly a factor of four; the duration assumed has to be stated with it.
- The blast report's threat — Charge weight and standoff, or the recorded peak pressure and impulse, plus the test method and the scale it answers on.
- The tested assembly's description — Specimen size, bite, frame section, anchors and the substrate they engaged, checked line by line against the shop drawing.
- Weight of the upgraded makeup — Combined glass thickness at the largest panel size, taken through to hardware, lifting method and temporary storage on a suspended slab.
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.