How Much Flake Do You Need for a Full Broadcast Floor?
Broadcast to refusal explained, why flake size changes the coverage rate, and how to avoid running short mid-floor.
Last updated August 20, 2026
A full decorative flake floor is broadcast “to refusal”, meaning flake thrown until the wet epoxy can’t visually absorb any more and no base coat shows through. The Flake Broadcast Calculator defaults to a typical full-broadcast rate of 7 ft² per lb, but flake size and technique both shift that number, so always check it against your product’s TDS. At that rate one 40 lb box covers 280 ft², which is the single most useful figure to carry in your head on site.
What “broadcast to refusal” actually means
Refusal is a visual endpoint, not a measured one. You keep throwing flake into the wet base coat until the surface stops taking it: the chips start landing on other chips rather than into resin, and no wet epoxy shows anywhere you look. That is the point the rate on this page is built around.
Two things follow from that, and both catch people out. First, refusal is a property of the whole floor, not of the patch in front of you, so a floor broadcast to refusal in the middle and lightly at the edges has not been broadcast to refusal. Second, a large share of what you throw never sticks. You are covering the floor in a loose layer, and once the base coat cures you scrape and vacuum the excess back off. The rate has to buy the flake that ends up bonded and a working depth of loose flake on top of it, because you cannot reach refusal without over-throwing.
That is why a coverage rate for flake is not a thickness. A gallon of base coat spread at 130 ft² per gallon lays down a film you could measure with a wet gauge. A pound of flake at 7 ft² per lb is a statement about how much material a given area consumes when a competent applicator throws it to refusal, including what gets swept up. Treat it as a consumption figure and it behaves predictably.
Where the 7 ft² per lb default comes from
It is the typical full-broadcast consumption of standard 1/4″ vinyl chip, and it is the same figure the Flake Floor Material Calculator uses for the flake layer of a complete system. Those two tools deliberately share one rate: they are describing the same physical act, so a floor sized on one of them and ordered from the other has to come out at the same number of boxes.
It is a default, not a specification. It is editable on the calculator precisely because the right figure for your job comes from the data sheet of the flake you are actually buying, and the sections below cover what moves it.
How to read the inputs
Floor Area
- The total area you’re broadcasting, in ft² or m². Feed this straight from the Square Meters / Square Feet Calculator
Coverage rate
- Pre-filled for a full 1/4″ broadcast to refusal, so edit it if your product’s TDS gives a different rate, or you’re doing a lighter accent broadcast
Box size
- The weight per box you’re ordering, so the result rounds to whole boxes instead of an odd fractional weight
Boxes Required
- Always rounded up. The result also shows the full purchased weight and your surplus, so you know what’s left over
Worked example
A typical single garage measures 540 ft². At the default full-broadcast rate of 7 ft² per lb, that needs 540 ÷ 7 = 77.1 lb of flake. Ordering in 40 lb boxes, that rounds up to 2 boxes (80 lb purchased), which leaves just 2.9 lb spare. That is about 7% of a box, so on a porous slab, a heavily textured substrate, or an outdoor job in any wind, order a third box rather than run the second one to the bottom.
Try it with your own floor
Enter your floor area. The default coverage rate assumes a full broadcast to refusal, so edit it if your job or product differs.
Full result gives the weight required, boxes to order, and surplus.
Open the live calculator →How much spare a whole box order actually leaves you
Flake only sells in whole boxes, so your real surplus has nothing to do with good practice and everything to do with where your floor lands against the 280 ft² a box covers. That surplus swings wildly, and it is worth knowing which side of it you are on before you quote.
540 ft² garage
- Needs 77.1 lb, so 2 boxes and 80 lb purchased
- Leaves 2.9 lb spare, under a tenth of a box
750 ft² shop
- Needs 107.1 lb, so 3 boxes and 120 lb purchased
- Leaves 12.9 lb spare, about a third of a box
1,000 ft² bay
- Needs 142.9 lb, so 4 boxes and 160 lb purchased
- Leaves 17.1 lb spare, a little over 40% of a box
2,000 ft² warehouse
- Needs 285.7 lb, so 8 boxes and 320 lb purchased
- Leaves 34.3 lb spare, most of a whole box
Two floors of similar size can leave you with a few pounds or most of a box, and nothing about the job tells you which. That is the argument for reading the surplus figure the calculator gives you rather than assuming a whole-box order carries its own safety margin.
The exact-fit trap
The worst place to land is exactly on a box boundary. A 1,120 ft² floor needs 1,120 ÷ 7 = 160 lb, which is precisely 4 boxes with zero spare. Every pound you throw beyond the rate comes out of flake you do not have.
Measure the same floor as 1,121 ft² and it needs 160.1 lb, which rounds to 5 boxes and leaves you 39.9 lb over. One square foot of measurement, one whole extra box, and a jump from nothing spare to a full box spare. If your floor sizes to a round box count, treat that as a warning rather than a tidy result, and price the extra box in.
What moves the rate off 7
Flake size
- The biggest single factor. Larger chip covers more area per pound than fine chip at the same visual density, so a 1/8″ blend and a 1/4″ blend do not consume alike. Take the rate from the TDS of the size you ordered
Surface profile
- A porous or heavily profiled slab holds more resin and more flake than a smooth, well prepared one. If you ground aggressively, expect to be at the heavy end
Technique and conditions
- Throwing high and letting flake fall flat uses more than flicking it low, and any wind on an outdoor job carries material off the slab entirely. Both push consumption up, neither is in the data sheet
Edges and cut-ins
- Perimeters, coves and around obstacles get broadcast by hand at a slower pace and usually heavier. A floor with a complicated outline consumes more than its area suggests
If you are not broadcasting to refusal
A light accent broadcast is a different job, and the default rate will badly over-order for it. Edit the coverage field to a much higher ft² per lb figure and the result moves fast: a 1,000 ft² floor needs 142.9 lb at the full-broadcast default, but only 35.7 lb at 28 ft² per lb, which is 4 boxes against 1. Running the default on an accent job is the most expensive single mistake on this page.
Common mistakes
- Using the full-broadcast default rate for a lighter accent broadcast, which will significantly over-order flake for a partial application
- Not checking flake size on the product TDS, when larger flake covers more area per pound than fine flake at the same visual density
- Ordering the exact required weight instead of rounding up to full boxes, when running short mid-broadcast on a wet floor is a serious problem
- Not accounting for extra material on porous, textured, or outdoor surfaces exposed to wind
- Assuming a whole-box order always carries a useful margin, when a 540 ft² garage leaves under 3 lb spare and a floor that lands on a box boundary leaves none at all
- Treating the coverage rate as a thickness, when it is a consumption figure that already includes the loose flake you scrape back off
- Sizing the flake on one calculator and ordering from the other without checking they used the same rate
Frequently Asked Questions
What does “broadcast to refusal” mean?
Throwing flake until the wet epoxy visually can’t absorb any more and no base coat shows through. That’s the standard for a full decorative flake floor, and what the default coverage rate on this calculator assumes.
Why does my flake size affect the coverage rate?
Larger flake covers more area per pound than fine flake at the same visual density, so the ft²/lb (or m²/kg) figure changes with flake size. Always confirm against your specific product’s TDS rather than relying on the default.
What if I only want a light accent broadcast, not a full one?
Edit the coverage rate to a much higher ft²/lb (m²/kg) number. The default assumes a full broadcast to refusal, and using it for a lighter accent broadcast will significantly over-order flake.
How much extra should I keep on hand?
Flake is inexpensive relative to the labor and downtime of re-ordering mid-job, so it’s fine to round up a full extra box. Running short mid-broadcast on a wet floor is a much bigger problem than a partial box of leftover flake.
How many square feet does one box of flake cover?
At the default full-broadcast rate of 7 ft² per lb, a 40 lb box covers 280 ft². That is the most useful figure to carry on site, because it tells you at a glance roughly how many boxes a floor needs before you open the calculator. Both numbers are editable, so recompute it if your product or your supplier’s box size differs.
Why do both flake calculators use the same coverage rate?
Because they describe the same physical act. The Flake Broadcast Calculator sizes the flake layer on its own and the Flake Floor Material Calculator sizes it as part of a three layer system, but in both cases it is flake thrown to refusal over a wet base coat. A floor sized on one and ordered from the other has to come out at the same number of boxes, so the two tools share one default rate.