Making Wargaming Terrain: Styrofoam Hills

I’ve been looking at making my own hills. Big hills to complement the smaller commercial hills I’ve already purchased. I knew I should use High Density Polystyrene which is otherwise called Blue or Pink Foam. But I was struggling to find that. Luckily, after a bit of googling, I found a good explanation of Styrofoam on Blue Foam, Pink Foam, Foamboard and Styrofoam.

What is Styrofoam?

The fluffly white stuff used in packaging is also polystyrene but is expanded polystyrene. Don’t use this for modelling as it is far less durable.

The stuff you need is High Density Polystyrene. This is also called extruded polystyrene because of the production method used. It is also known as Styrofoam after the leading brand.

The colour doesn’t matter so forget the “pink” or “blue” foam of a few years ago. What matters is the density. Get a density of at least 32kg/m3. Denser is ok (right up to 200kg/m3 foam which is used to make surfboard blanks)

Where to find Styrofoam?

Google for “Styrofoam” or “Underfloor Insulation”. Typical brand names are:

  • Styrofoam LBX / DOW Styrofoam IB (UK/USA/Eur/Aus/NZ)
  • Floormate (UK)
  • Foamular (USA/Oz)
  • Styrodur (Europe)
  • Roofmate (France)
  • De-Q-cell (Germany)
  • Depron foam is a denser brand and hence good for thin features

For 600x600mm styrofoam tiles check out

For 10mm sheets

For 2mm MDF to use as a backing sheet

How Thick?

My hills have between 12mm (1/2″) and 25mm (1″) elevations. But horses for courses.

Increasingly I think lower highs are better as the figures are more likely to stand on them without falling over.

Some of my commercial hills are 10mm foam (per level) backed by 2mm MDF.

How to Glue Styrofoam

Wood glue (e.g. PVA) might not work because it dries with contact through air. Some foams allow air to penetrate but many don’t. You can do an experiment by gluing a couple of foam pieces together and waiting 24 hours; when you prize the foam apart you know you’ve got an ok glue for that foam if the glue has dried in the middle.

A sort of middle ground is to use a hot glue gun in the middle (without the glue being too hot or the foam will melt) and PVA around the edge

Probably easier to use appropriate glues such as UHU Por or Foam-2-Foam to stick styrofoam together.

A few home made hills in use for a Liberators HOTT game:

Maipo 223138 from Patriot side
Maipo 223138 from Patriot side


  1. Optional step 1: Glue 2mm MDF to back of Styrofoam
  2. Cut the Styrofoam into hill shapes with an old bread knife. The serrated edge helps. Do it bit by bit.
  3. Rough up any flat surface remaining on the upper surface by scraping with the serrated edge of the knife.
  4. Glue together layers if you want multiple elevations
  5. Glue small rocks to the upper surface with PVA
  6. Glue sand to upper surface with diluted PVA
  7. Paint brown
  8. Dry brush lighter colours
  9. Glue (with diluted PVA) flock in patches.

See my Flocking page for more advice on the last few steps.


Blue Foam, Pink Foam, Foamboard and Styrofoam

4 thoughts on “Making Wargaming Terrain: Styrofoam Hills”

  1. Hi Steven,

    Nice idea! I wanted to give you alternative that avoids MDF and sticks to a gaming mat like Velcro. I cut the styrofoam, and glue it using Allene’s Spray tacky glue onto a pre-stiffened felt base. I stiffen the felt with generous passes of a spray paint can. Step 2 is to spray the styrofoam hill with the same glues and then cover with a fresh piece of felt. Now you want the upper layer of felt to overhang the base layer by about 1/4 inch. This ensures a smoot transition between the hill and the game surface.

    Lastly you spray pain the top layer of felt various shades to taste, and flock if desired.

    The felt slopes allow troop bases to grab like glue!

    • Sounds very interesting. I think I’ll give it a go. Why do you stiffen the felt on the base?

  2. i Steven,

    I pre-stiffened it to make it easier to cut a sharp and consistent edge to follow the styrofoam. I find felt can be a pain to measure and cut unless already pre-stiffened. I also find that if the felt is pre-stiffened (usually just with a good, liberal, several passes of a spray can) it seems to take glue better, and be less sponge-like in absorbing glue away from the contact surface. The top layer of felt will overhang the bottom, so that when laying flat on the game table, it blends nicely.

    The key issue with ALL hills, if using WRG basing in 15mm scale, is in not making the gradient very steep, since otherwise troops will tip over and/or slide annoyingly down the hillside. Also, steep hills make any trees placed on them look they’re leaning quite a bit.


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