Is Plywood Safe To Use For Your Guinea Pigs Hideout?

If you’re in the market for strong durable construction material, then plywood is a great option.

It’s affordable, stable, and surprisingly lightweight. All of which are great reasons for using this engineered wood to make everything from ceilings to floors.

But, plywood has been put through a manufacturing process that infuses toxic chemicals into this material. So, if your pets like to chew wood, plywood may be far too hazardous to use around your guinea pigs.

So, in this post, you will find out what plywood is really made of — and what this means for your guinea pigs health. You’ll also discover which wood types are safe enough to use around our fuzzy little friends.

is plywood safe for guinea pigs

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What Is Plywood Actually Made Of?

Well, plywood is an engineered material, which means that it isn’t a natural wood.

Instead, plywood is made up of multiple thin wooden plies. And those plies are placed atop one another, at alternating angles.

However, the particular wood used to make plywood can vary widely. Various types of wood, from Douglas Fir to Maple to Birch, have been used to make this material.

Still, one thing all plywood sheets have in common, is the fact that an adhesive is used to make them. And when it comes to a typical plywood sheet, that adhesive will contain formaldehyde resins called phenol-formaldehyde.

And Why Is Phenol-Formaldehyde Adhesive So Toxic?

It all boils down to the fact that formaldehyde itself is incredibly dangerous. If it is ingested in large enough amounts, it is poisonous — both to humans and pets.

Even formaldehyde vapor can cause severe respiratory problems. And in liquid form, it can burn our skin.

Does That Mean Plywood Can Release Toxic Fumes?

Solvent-based substances, (such as glues and paint), all go through something called ‘off-gassing’. Off-gassing refers to the fumes released from finishes, glues, and paint, as they dry.

It can take just a few hours for wood glues or paints to dry to the touch. However — as anyone who has painted a room can attest — it can take weeks for the fumes to clear up.

And the same goes for phenol-formaldehyde based glues. It can take up to 24 months for this glue to stop releasing significant amounts of fumes into the air.

Nevertheless, store-bought plywood will have already had time to sit and dry out. Which means that formaldehyde off-gassing shouldn’t be all that severe with this plywood.

But, even if off-gassing isn’t an issue, ingesting any plywood at all can still bring harm to guinea pigs. Why? Well because…

…Treated Plywood Is Full Of Chemicals

Plywood is not rot-resistant. So, more often than not, a sheet of plywood will have been ‘treated’ with rot-resisting chemicals.

And these chemicals are anti-fungal wood preservatives. Their job involves fighting off the bacteria responsible for wood rot.

However, the chemicals infused into treated plywood — such as Chromated copper arsenate (CCA) — are toxic. Certainly much too toxic to risk being ingested by guinea pigs.

Now, having said all that, you can still find and purchase untreated plywood.

But, without a wood preserving chemical treatment, untreated plywood will rot away fairly quickly. Especially if moisture or humidity gets into it.

Is There A Formaldehyde-Free Plywood I Can Use Instead?

There are certain specialized formaldehyde-free plywoods you can buy. And they are marked as NAF (No Added Formaldehyde) Plywood.

These plywood sheets are glued together using a natural-alternative adhesive, instead of formaldehyde-based glues.

That’s Great! So, I Can Use NAF Plywood Instead, Right?

Not quite.

Sure, NAF Plywood completely does away with toxic wood glues. But, it replaces them with a soy-based adhesive instead.

Which is great news, until you realize that Soy contains something called phytoestrogens. Phytoestrogens are plant-based compounds, but they can cause hormone imbalances in both humans and guinea pigs.

So, if your pet likes to chew on wood — and you suspect they may also chew that plywood — then this is another possible safety risk.

Now, maybe this is all acting with an over-abundance of caution. Maybe avoiding even NAF plywood is simply being a little too careful.

But, it’s always better to err on the side of caution, when it comes to pet safety.

So Does That Mean Plywood Is Not Safe For Guinea Pigs?

Well, the safest type of wood you can use is always going to be untreated natural solid wood. What’s more, that wood must come from a tree species that isn’t harmful to guinea pigs.

Which means that plywood is not safe around guinea pigs.

In fact, you can go one step further and avoid all manufactured woods — since they often contain toxic chemical glues.

Related Post: Just What Is Manufactured Wood Anyway?

So What Types Of Wood Are Safe For Guinea Pigs?

The safest type of wood you can use is natural kiln-dried solid timber. And you need to make sure that it’s free of any chemical treatments.

Moreover, that timber must come from a wood species that’s safe for guinea pigs, such as Apple wood.

Related Post: Want To Use Apple Wood For Woodworking? 3 Things To Know

And always avoid using wood types that have a lot of sap in them.

Tree sap is a resinous substance that trees secrete to help fight off insect attacks. This natural substance will harm your pets if they happen to ingest enough of it.

So, wood types that contain a lot of sap, (such as Cedar and Pine) are unsafe around a guinea pig.

What Is Kiln Dried Wood? This is wood that has been dried inside a kiln until its moisture content levels are very low. Freshly cut lumber has a moisture content of around 100%, but kiln dried lumber has a moisture content of around 12-18%.

To Wrap Up, Here Are The 3 Key Takeaways From This Post…

  • 1). Plywood is a manufactured wood, often made using formaldehyde-based glues.
  • 2). Plywood also tends to be treated with chemical wood preservatives.
  • 3). When it comes to the health of guinea pigs, it’s better to be safe than sorry. So, avoid using plywood altogether.


Treated Wood In The Landscape | Home & Garden Information Center

The pros and cons of phytoestrogens | National Library of Medicine

Soy and phytoestrogens | National Library of Medicine

Making the right home for your guinea pigs |