A custom surfboard starts as a foam blank and becomes a finished board in four stages: shaping, glassing, sanding and fitting the fins. At Flatrock Surf, we reckon the board you get back is only as good as the brief you give. This guide walks through each stage and ends with a checklist of what to tell your shaper when you order.
How does a foam blank become a surfboard?
A shaper takes a foam blank, a rough block of foam with a thin timber strip called a stringer down the middle, and carves it by hand into the outline, thickness and curves you asked for. The blank is the raw material. Everything that decides how the board paddles and turns gets cut into it from here.
Blanks come in different lengths and thicknesses, so the shaper picks one close to your finished board and takes away what you don't need. You can't add foam back once it's gone, which is why the brief matters so much.
What is the shaping process, step by step?
Step 1: Outline and templates
The outline is the shape of the board seen from above. Shapers often trace it from a template, a cut-out guide of a shape they trust, then adjust the width, nose and tail to suit you. A wider outline gives you more stability and paddle power. A narrower one tends to feel quicker from rail to rail.
Step 2: Planing the blank
Next the shaper planes the blank down to the right thickness, taking foam off the top (the deck) and the bottom. Thickness, and where it sits along the board, sets the volume, and volume is the biggest factor in how easily you catch waves. Our shortboard volume guide shows how to work out a starting number for your weight and ability.
Step 3: Shaping the rails
Rails are the edges of the board. Fuller, rounder rails feel forgiving and stable. Thinner, more tapered rails sit lower in the water and bite harder on a turn, but they ask more of your balance. Rails take the longest to shape, and they show the most skill.
Step 4: Bottom contours and the tail
The shaper then cuts the curves under the board. Rocker is the curve from nose to tail. More rocker helps in steep, hollow waves, and less lets you glide through flatter sections. The tail shape, such as a squash, round or pin, changes how the board holds in the wave and how loose it feels on a turn.
What happens in glassing and sanding?
Glassing wraps the shaped foam in layers of fibreglass cloth and resin, which makes the board strong and waterproof. Once the resin cures, the board is sanded smooth. The fins go in during the glassing stage or after it, depending on the setup you chose.
Construction is a real choice. A foam core with polyester resin is the traditional build. Another common build uses a different foam with epoxy resin. They flex and feel different underfoot, so ask your shaper which suits your surfing rather than assuming one is better for everyone.
After the resin has cured, the surface is sanded and polished. That last sanding is where the board gets its finish, whether you want a clean gloss or a rougher, grippier surface.
What should you tell your shaper when you order?
Give your shaper your height and weight, your skill level, the waves you surf most, and the volume, tail, fin setup and construction you want. Each one changes how the board paddles and turns, so the more specific you are, the closer the first board lands.
- Height and weight: these set the volume range that will float you. Too little volume and you'll struggle to catch waves.
- Skill level: be honest. A board built for a stronger surfer feels twitchy and hard to paddle if you're still building skills. If you're stepping up from a first board, our guide to intermediate surfboards covers the move.
- Local waves: small, mushy beach breaks usually suit more volume and a flatter rocker. Steeper, more powerful waves usually suit a thinner board with more curve.
- Volume: ask for a litre figure, not just "a bit thicker". It's the clearest way to talk about paddle power.
- Tail: a wider tail adds lift and drive in small surf. A narrower tail holds better in bigger, steeper waves.
- Fin setup: three fins, four fins or a single each change how the board drives and releases through a turn. Tell the shaper what you've ridden and what you liked.
- Construction: say whether weight, durability or flex matters most to you, and what you're prepared to spend.
Why do these choices change how a board surfs?
Every measurement trades one thing for another. More volume and width mean easier paddling and earlier wave entry, but a slower, less responsive turn. Less volume and a narrower outline give you sharper turns, but you'll work harder to get into the wave. A good shaper balances the two for your body and your local spot.
It also helps to bring a board you've ridden and liked, along with what you'd change about it. A shaper can read dimensions off it faster than any description, then adjust from there.
What should you wear for the sesh?
A new board deserves a proper first session, and a wetty that keeps you out there longer means more time learning how it feels. Have a look at our 3/2mm steamerand check the product page for the water temperature range it's made for. You can see the rest of our range too.
Frequently asked questions
How long does it take to make a custom surfboard?
It depends on the shaper's workload and the stages involved, so ask for a timeframe when you order. Shaping, glassing and sanding are separate jobs, and the queue at each one can change how long yours takes.
What volume should my custom surfboard be?
Volume depends on your weight, fitness and skill level. Our shortboard volume guide gives a starting range, and your shaper can fine-tune it for the waves you surf.
Is a custom board better than an off-the-rack board?
A custom board is built to your measurements and local waves, so it can suit you more closely. That only pays off if your brief is accurate, so be honest about your ability.
What is the stringer in a surfboard?
The stringer is a thin strip of timber running down the centre of the foam blank. It adds stiffness along the length of the board.
Can I choose my own fin setup?
Yes. Fin setup is part of the order, so tell your shaper what you've ridden before and how you want the board to feel through a turn.
