Better Walls With Foamboard

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Foamboard is a great material for building walls. This blog will walk you through, step by step, all the tools you’ll need and how to do it.

What is Foamboard?

Foamboard, also known as polystyrene foam or expanded polystyrene (EPS), is a type of lightweight board that’s used for many things. It’s popular with crafters and DIYers because it has so many different uses and can be easily cut into shapes and glued together.

You can use foamboard to create signs, build walls, make furniture panels, line drawers and cabinets with fabric patterns, teach children how to write letters by tracing their hands onto the surface of a piece of foamboard—the possibilities are endless!

If you’re interested in learning more about what makes this material so versatile, read on!

Why not use plywood?

Plywood is a good alternative to foamboard because it’s more affordable and it’s less susceptible to moisture. However, plywood can be difficult to cut and it’s also more difficult to attach as it requires nails or screws that penetrate through the sheets. Moreover, since you have to nail each piece of plywood individually, you need a lot of time and patience in order for your wall to be properly installed. Foamboard does not require any tools in order for it to be nailed onto studs or joists; all you need is an adhesive and a pair of scissors!

Furthermore, if there were ever any leaks from pipes or windows then they will go through plywood much faster than they would through foamboard walls because of their porous nature which makes them absorbent (not unlike cardboard).

How to choose foamboard.

Before you start building your walls, it’s important to make sure you choose the right type of foamboard. Not all boards are created equal! There are several different types of board, each with its own set of benefits and drawbacks:

  • 1/4″ thickness: This is a lightweight yet durable option that can be easily transported and installed in various locations (e.g., on-site). The drawback is that because it’s so thin, it can warp when exposed to moisture (like rain or humidity), making it less than ideal for outdoor applications like patios or porches but great for indoor projects such as walls around bathtubs and showers.

What tools will I need?

  • A screwdriver
  • A tape measure
  • Pen and pencil, or chalk line and chalk. (I prefer the former, but some people like to use a chalk line.)
  • A level. You have to have one of these, so don’t go getting lazy on me! It’s great for laying out your lines and making sure everything is straight and level. If you don’t already own this tool, buy one; they’re cheap and easy to find at any hardware store or big box retailer. (I use this one from Amazon.)

The other tools are optional depending on what kind of wall you want to build:

  • Utility knife (or box cutter) + replacement blades – for cutting foamboard sheets into smaller pieces; replace blades when they get dull or broken (available at most office supply stores)

Pick the right adhesive.

There are two main types of adhesives: construction adhesives, and contact adhesives.

Construction adhesives are used to glue wood together. They’re usually white or gray in color, and you’ll find them at local hardware stores like Home Depot or Lowes. Construction sealants can also be used on foamboard walls; they’re essentially just a thicker version of the regular construction adhesive so you don’t have to worry about leaks around the edges when using it for your wall project!

Contact adhesives are used for things like sticking posters on your wall—you can get contact glues at any craft store like Hobby Lobby or Michaels, or even Walmart if you don’t have access to anything else!

How to seal your foamboard.

When it comes to sealing your foamboard, there are a few options. The first is silicone caulk. Silicone caulk can be purchased at any hardware store and will make an excellent seal on your walls. It’s important to note that this type of sealant will not dry as clear as other types of caulks, so if you want your walls to look sleek and professional, this may not be the best choice for you.

Another option is polyurethane sealant; also known as “PUR” or “polyseal” depending on the brand name (it has many). This type of sealant dries clear and gives off no odor while curing in the air around it (unlike silicone). PUR can also be painted over once dried which gives it added versatility when compared with silicone caulk which cannot be painted once dried due to its milky appearance after curing

Apply adhesive to the studs.

Now that the foamboard is in place, the wall is ready for adhesion. If you want to give your walls a textured finish, you can apply adhesive with a brush or roller. If you want to make more detailed designs and patterns, use paintbrushes or sponges instead.

Apply adhesive to the boards.

Make sure the boards are lined up so that they’re all even. You can use a level to make sure the board is straight, or hold it up against an existing wall and make adjustments as needed. If you’re using pre-cut foamboard, there’s no need to worry about making those kinds of adjustments; just match up your corners and start applying adhesive!

As you apply glue on one side of your first piece of foamboard, spread it evenly with your paintbrush so that both sides will get equal coverage (but don’t go overboard—you won’t have time for batches of glue if you do). Once you’ve got enough adhesive on one side to stick well without dripping down onto other parts of your project area, set this piece aside for a few minutes while working with another section. This will allow plenty of time for excess moisture from spreading to evaporate before continuing work on next pieces

Attach the foamboard to the wall.

The next step is to attach the foamboard to the wall. For this, you can use a nail gun if you have one and don’t mind spending a little bit of money, or you can do it with a hammer and nails if that’s all you have access to. You’ll also want to use a level so that your boards are straight on all sides, because doing so will make sure they’re level with each other when they meet in corners.

You should be able to find some sort of stud finder at any hardware store for around $20-$25 USD (this is what I used), but if not there are also ways that do-it-yourselfers have come up with over time without having access to one! One way involves using masking tape: just stick the tape down onto each side of where you want your board to go (but don’t stick it too close!) Then using either pencil or pen draw an X on each side where these pieces intersect; these Xs generally indicate where there might be some kind of support beam behind whatever surface is being removed from — like drywall! If there isn’t any space between these two intersections then odds are good that no such support beam exists behind them since most builders would’ve put something back here after installing insulation like we did earlier today during Step 3: Insulating Your Walls With Foamboard.”

Seal seams in your foamboard walls.

To seal your seams and make the walls look nice and neat, use seam tape. Seam tape is available at most hardware stores and has a variety of uses. It’s easiest to apply if you put it on the inside of the foamboard first, then stick it to the other piece before putting them together. This will give you more control over how much tape sticks out of each side of the seam.

When it comes time to paint or stain your wall, don’t forget about sealing those seams too! Seam tape is easy enough to remove after staining or painting if need be as well as easy enough for DIY’ers who aren’t experts (like myself) so don’t worry if you mess up applying it because chances are good that it won’t show once everything else is applied anyway

Use foamboard for better walls

  • Foamboard is a great alternative to plywood because it’s less expensive and more durable. Plywood is the most common material for building walls, but it can be heavy and difficult to work with if you don’t have the right tools. You might have an easier time using foamboard instead!
  • Foamboard is easier to work with than plywood because of its lightweight structure, which makes it easy to cut and fit into place. This means that you can save yourself some time by not having to worry about making sure that everything is exactly right before installing them into your scene or set design.
  • Foamboard has more fire resistant properties than plywood due to its closed cell construction (foam between two sheets). This means that if something catches fire in an area where there’s foamboard installed, then those flames won’t spread very far because there isn’t any oxygen getting inside those cells!


Hi there! And welcome to our blog post. We hope you’re having fun with building your own walls, and if not, well that’s okay too. This blog series is all about helping you to know what you need to do and the tools you need to get it done, but we’ll be here when you hit a road block or just need some friendly advice from us. Let’s get started!

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