Tabletop Game Terrain From Packaging Foam and Cardboard

A regular at my Saturday stall asked last month what I would charge for a set of hills and ruined walls for his tabletop group. He had priced a commercial terrain box at a little over fifty dollars and wanted to know whether scrap could do it cheaper. I said yes, then spent two weekends finding out how much cheaper, and which scrap fights back.

Most terrain tutorials assume you will buy sheets of insulation foam and a hot wire cutter before you start. Most of what you need is already in your recycling bin. The catch is that packaging foam and cardboard behave differently from the materials in those tutorials, and the first piece usually fails in a way nobody warns you about.

Which packaging foam is worth keeping

Two kinds of white or coloured foam turn up in boxes, and they look similar until you cut them.

Bead foam, the kind that sheds little balls when you snap it, is expanded polystyrene. It comes around televisions and small appliances. It carves badly with a knife because the beads pull out, leaving a pitted surface. That pitting is actually useful for rocky hills and rubble, so I keep the thicker blocks.

Smooth, dense foam with no visible beads is usually extruded polystyrene or a polyethylene packing foam. Extruded foam carves cleanly and takes fine detail like brick lines pressed in with a ballpoint pen. Polyethylene foam, the slightly rubbery kind that bends without snapping, is close to useless for terrain because paint and glue slide off it. A quick test: press a fingernail in. If the dent stays, it carves. If it springs back, it goes in the bin.

Cardboard splits the same way. Cereal box card, about half a millimetre thick, is right for doors, shutters and planks. Corrugated shipping card, around 3 to 4 millimetres, makes walls and floors, and peeling one face off exposes the ribs, which pass for a corrugated metal roof at tabletop scale.

Scale before you cut anything

Most tabletop miniatures sit around 28 to 32 millimetres from foot to eye. Many role playing groups also play on a one inch grid where each square stands for five feet. Those two facts give you the numbers that matter:

• A doorway should be about 40 to 45 millimetres tall, or the figures look like they are crawling through a dog flap.
• A wall that blocks line of sight needs to be at least 50 millimetres high.
• Hills work best in steps of 15 to 20 millimetres so figures stand on them without sliding off.
• Gaps between ruined walls should be at least 30 millimetres wide, the width of a typical round base plus fingers.

I learned the last one the hard way. My first ruin looked wonderful and was unplayable, because nobody could reach in to move a figure without knocking a wall over.

The mistake that melts your first hill

Every guide tells you to spray paint terrain because it is fast. With polystyrene foam, spray paint is the worst choice you can make. The solvent in most aerosol paint dissolves polystyrene on contact. My first hill went from a nice slope to a cratered, shrinking lump in about forty seconds, and the fumes were ugly.

The fix is to seal the foam before any paint touches it. Mix white PVA glue with water roughly one to one, add a handful of fine sand or dried coffee grounds, and brush it over every surface. Two coats, dried overnight between them, give a hard shell that also hides the bead texture where you do not want it. After that, brush on paint, or spray only once the shell has fully cured, and test on a scrap first.

If you cut foam with a hot wire or heated knife, work somewhere with real airflow. Melting polystyrene gives off styrene fumes you do not want to breathe in a closed room. I covered ways to handle that in managing dust and fumes in a space you cannot vent. For packaging foam, a sharp snap blade knife, extended long and replaced often, does almost everything without heat.

What a full set actually cost me

Here is the ledger from the set I eventually sold to that customer: three hills, four ruined wall sections, two small huts and a scatter of rocks. Everything that came free came from my own bins or the market's cardboard pile.

That comes to $17.02 in materials, with glue and paint left over for a second set. The real cost was time: about nine hours across two weekends, most of it waiting for glue to dry. I charged $45, which undercut the boxed set and worked out to about $3.10 an hour once materials came off. That is a hobby rate, not a business rate. If you plan to sell terrain, put your hours in the ledger before you set the price. Most makers skip that line, and it is the one that decides whether the work pays.

Small pieces that make a table look finished

Rocks are the cheapest win. Tear chunks from the cardboard cups of an egg carton, glue them to a card base, seal them like the foam and drybrush grey over black. Twenty rocks took one evening.

Wine corks cut into three make tree stumps with real bark texture. Toilet roll tubes become watchtowers once wrapped in cereal box planks. Coffee stirrers, washed, are a neat stand-in for fence rails. None of this looks like a museum diorama up close, but at arm's length across a table it reads as a place, which is all a game needs.

Painting is where patience pays off. Base coat everything black, then drybrush: wipe almost all the paint off a stiff brush and drag it lightly over raised edges. Two or three passes in lighter shades pick out texture without any fine brushwork. Painting the figures that stand on this terrain is a slower discipline, and Junie wrote about it in what painting game miniatures teaches about patience.

If you have leftover card after a build, the techniques in turning scrap paper into something worth keeping carry straight over to signs, scrolls and maps for the same table. And if your group needs somewhere to roll, the wooden dice tray and tower pairs well with a terrain set as a bundle.

Start with one hill this week

Go through your recycling this week and pull out one block of foam. Do the fingernail test, carve a single stepped hill about 20 millimetres per level, give it two coats of glue and sand, and paint it black with one drybrush pass. One finished hill will teach you more about your particular foam than an afternoon of videos, and it tells you whether a full set is worth your Saturdays.