The piece count is the job, not the area
The default list here is ten openings covering 134 square feet, which is four sheets by area and sounds like a Saturday morning. Cut into strips a person can carry alone it is 19 separate pieces off 10 sheets, because a piece is cut to fit an opening and not to fit a sheet. Each of those 19 needs measuring, cutting, labelling, drilling if it is fixed through, carrying, lifting, holding while somebody else fixes it, and then storing.
The takeoff on this page reports pieces alongside sheets for that reason. The piece count is what predicts the hours, the number of fixings, the number of labels, and the amount of garage wall that disappears permanently. If the number comes out uncomfortably high, the lever is the strip width: wider strips mean fewer pieces and a heavier lift each, narrower strips mean a one-person job repeated more times. That is a genuine trade and it is yours to make.
Kerf is why the sheet does not divide evenly
A 48 inch sheet does not yield two 24 inch strips. The blade takes an eighth of an inch with it, so the two strips come out at 24 and 23.875, or you cut both at 23.9375 and they match. It sounds pedantic and it changes the sheet count, because a nesting calculation that assumes exact division will tell you a job needs half the sheets it really does.
The calculator handles this the honest way: it works out how many pieces of your chosen width fit across the sheet including the kerf, and it also tells you the width at which one more piece would fit. That second line is often the useful one — trimming a strip width by a quarter inch can take a job from three sheets down to two, and nothing about the finished cover changes.
| Sheet width | Strip width | Kerf | Strips across |
|---|---|---|---|
| 48" | 24" | 1/8" | 1 — the second one does not fit |
| 48" | 23 15/16" | 1/8" | 2 |
| 48" | 16" | 1/8" | 2, with 15 3/4" left |
| 48" | 15 7/8" | 1/8" | 3 |
The nesting here is deliberately simple: each opening type is nested on its own and offcuts are not carried across types. That makes the sheet count slightly conservative and the offcut figure real. If you want a tighter cutting plan across the whole job, the plywood sheet calculator is the general-purpose version.
Storage is the constraint nobody counts
A set of covers gets used for a few days and stored for years. The default list here comes out at 10 sheets of half inch material — 19 separate pieces, about 450 pounds, standing five inches deep against a garage wall at the full height of the tallest piece. Five inches sounds like nothing until it is five inches of the only clear wall in the garage, for a decade, and that is the reason sets get thrown out and then have to be remade under time pressure.
The page reports the stack three ways — flat height, edge-on footprint, and load per square foot — because the answer to where it goes usually turns on one of them. If it is going overhead, the overhead storage platform load calculator is the one that matters, and general shop storage volume is covered by the material storage space calculator.
Label everything, on the outside face
This is the cheapest thing on the page and the one that most reliably decides whether a set gets used. Every piece is cut for one opening, one way round. A year later, in fading light, with several of them looking similar, nobody remembers. Mark the room, the position and which way is up, on the face that ends up outward, in something that survives a decade in a garage. Then store them in fitting order, so the first one out of the stack is the first one that goes on.
What the page will not tell you
Whether covers are required for your building, what material or thickness is acceptable, how far a cover must extend past an opening, what fixings hold it, at what spacing, or whether any of it satisfies a code or an insurance condition. Those come from the panel manufacturer, from your building department and from your insurer, and the insurance answer often differs from the code answer and can affect a premium. The coverage and fixing spacing fields on this page start at zero for exactly that reason: put in what you are given and the arithmetic follows. Background on the rest of the preparation sits in the hurricane preparedness guide.
Questions people ask
How thick should plywood window covers be?
This page does not answer that and the field is an input for a reason. Acceptable material, thickness and attachment for a storm cover are specified by the product manufacturer where there is one, by whoever adopted the requirement where you live, and frequently by an insurance policy that is stricter than either. They also differ by opening size and by exposure. Ask the building department and get the insurance version from your insurer in writing, because an underwriting condition is not published in a code book. The thickness field here only drives weight and stack height.
Why does the calculator say only one 24 inch strip fits on a 48 inch sheet?
Because of the saw kerf. Two 24 inch strips plus one 1/8 inch cut is 48.125 inches, which does not come out of a 48 inch sheet. This is the correct answer to the question as asked rather than a quirk, and it is the reason sheet counts based on tidy division come out low. The page also reports the width at which one more strip would fit — in this case just under 24 inches — so you can decide whether trimming an eighth is worth halving the sheet count. Set the kerf to zero if you want the idealised figure.
Should I use wide panels or narrow ones?
It is a trade the calculator makes visible rather than one it decides. Wide pieces mean fewer of them, fewer fixings, fewer labels and fewer storage slots, but each one is heavier and more awkward, and a large flat panel in wind behaves like a sail on a ladder. Narrow pieces mean a one-person lift repeated many more times, and a piece count that can double. Change the strip width and watch the pieces, the fixings and the heaviest single piece move together. Any minimum or maximum that applies comes from the manufacturer or the authority, not from here.
How much storage space does a set take?
More than people expect, and the page gives it three ways. The default list is 10 sheets cut into 19 pieces, which stacks five inches high flat on a sheet-sized footprint, stands about the height of the tallest piece by five inches deep on edge, and weighs a little over 450 pounds. That is a real claim on a garage wall for the years between uses, and it is why sets get discarded and then remade under time pressure. Deciding where it lives before you cut anything is part of the job.
Does this tell me if my house is protected?
No. It is a materials takeoff and nothing more. It counts pieces, sheets, fixings at a spacing you supplied, weight and storage space. It does not evaluate whether covers are needed, whether they will perform, whether the attachment is adequate, or whether anything complies. Those judgements belong to the manufacturer, the building department and your insurer, and a wind rating is a tested property of a specific assembly rather than something arithmetic can produce.