Camper Fastener Count by Panel Calculator

Before you drill, count your way out of panic. Counting your fasteners prevents plywood from becoming a sieve. Once you drill too many holes, there is no turning back on those sheets.

You won’t have to buy extra boxes of screws, guess what you need, or make more hole. How many fastener will be needed for each panel? You gotta count for the edge rows, field rows, and your own screwups. Let’s face it, the calculator does all the math for you.

How to Count Your Screws

First enter in your panel. Is it going to be lauan plywood (standard), or something like thicker FRP? Why the material? Because that determines what fastener you’ll use. If you’re using thin aluminum, don’t try and drive a trim-head screw into it; it will strip. There is no sense in having those oversized rivet heads on a nice looking ceiling either. The tool adjust the weight estimates based off those material choices. That way you can keep your total weight below gross weight of vehicle.

But it’s about spacing, that’s where the engineer comes in. Don’t just throw screws all over at random, six inches here, there, everywhere. It’s a waste. Tighter spacing is required on edges which take vibration and flex. Wider spacing are possible on field rows (e.g. Space them 12 to 16 inches apart. The table of references show these spacings according to each kind of panel.

Door inserts require tighter spacing then static cabinet backs. Doors come and go; they take abuse. The ceiling doesn’t budge.

Don’t double-count seams where multiple panels meet. For instance, if two panels join at one of the wooden ribs then they don’t each requires a column of screws through that seam. That’s a seam that gets counted once, for both panels together. Counting each side separately means you’ll purchase fasteners you won’t use. The calculator handles this for you by taking out any doubled-up lines. It all adds up when you’re working with lots of panel.

This gets even more complicated with openings. Each one adds another count, reinforced on the perimeter of each vent or hatch. Unsupported edges cause cracking, so they must be supported. There are bunches of additional fastener around the hole. Add another counter for each opening. No calculating by hand; this holds it all together.

Always add A BUFFER: Van building isn’t a spreadsheet. Cross threading a screw or dropping it on the floor ruins a fastener. Shifting a row because a rib is off center happen. Having that 10 to 15% buffer is insurance. It is insurance so you won’t have to go to the store before finishing the job.

Respect the structure of the vehicle, as well as the materials. Plan the fastener count accordingly; you’re making a shell that needs to flex with the road. Get the number of seams counted out and the spacing correct. Fill up that buffer bag. Know what is holding the walls up and then some for unexpected cutouts.

You should of added extra.