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15 Expanding Spray Foam Insulation Ideas and Applications

We all know spray foam is an insulation powerhouse, but it's also a versatile home improvement tool. Here are some genius uses for spray foam that you may have never considered.

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NEWFH14JUN_NOISES_28 spray foam insulation between pipes

Dull the Noise

Water supply lines can create a racket when in use. To prevent the problem, you can use a small amount of spray insulation foam between pipes and framing to keep the pipe in place and reduce noise. Here’s how to do it.

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FH04JUN_05044_040 DIY backyard waterfall and stream waterproof spray foamFamily Handyman

Create an Oasis

Create a backyard masterpiece with our DIY backyard waterfall and stream. To ensure a beautiful flow of water, use waterproof spray foam, to secure decorative rocks and fill gaps to keep water flowing freely.

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Don’t know which type of spray foam you need for your project? Watch this video:


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FH16DJA_EXPAND_07Family Handyman

Firm Up a Wobbly Shower Head

Squirt a little expanding foam around a loose shower arm and it’ll be solid as a rock. Let the foam set up until it’s stiff and carve off any excess around the shower arm. Slide the cover plate tight to the wall and you’ll never know there’s foam holding things together. This same trick firms up any other loose or wobbly pipes.

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spray foam insulation

Mind the Gaps

Versatile spray foam is still a go-to solution for insulating and filling gaps in walls, crevices and around windows and doors. For all the tips you need to become a master, check out our article on how to master spray foam.

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dfh17sep016_703391653 styrofoam airplane crafAJ Cespedes/Shutterstock

Carve Spray Foam

There is no shortage of creative uses for spray foam, and carving it is just one of many. Like the toy plane pictured, you can create props, costume accessories, and decor with a little patience and ingenuity.

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NEWFH98DJA_PARCEL_02 Spray foam to protect breakables and fragile items packaging

Protect Breakables

Whether you’re sending something fragile in the mail or keeping valuables safe during a move, secure packing is everything. To protect a delicate item, simply fill a spare shopping bag half-full with spray insulation foam and place in the bottom of a box, pressing the item gently into the bag as it hardens to cushion the item. Repeat for the top and you have a DIY custom packaging solution that can handle the rigors of delivery.

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dfh17sep016_545149183 spray foam diy picture frame craftZivko Trikic/Shutterstock

Frame It

An ingenious way to frame your original masterpieces is with a spray foam picture frame. All you need for this one-of-a-kind craft is a little cardboard for the frame, spray foam and the spray paint of your choice. Use another piece of cardboard as a picture backing and use finishing nails to finish this instant art.

Plus: Watch DIY Picture Frame with Mitered Corners

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dfh17sep016_417436666 bathtub bathroom modern wall art sticker2M Media/Shutterstock

Shore Up the Tub

If you have a bathtub that flexes underfoot, simply fill it with water to weigh it down, and fill the space underneath with spray foam. Many stand alone tubs have access panels that will allow you to reach these spaces. Otherwise, a small hole in facing drywall can do the trick and will require little patching to repair afterward.

Plus: How to Re-Caulk a Shower or Bathtub

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copper mesh for pest control

Keep the Critters Out

Any crack can be an interstate highway for pests to enter your home. Close any possible points of entry by filling cracks with copper mesh, using a screwdriver to push it in and then filling remaining gaps with expanding foam. For more DIY pest control ideas, click here.

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FH01FEB_02217007 expanding spray foam to prevent mold in uninsulated corner exterior wall spaceFamily Handyman

Prevent Mold in Corners

Due to some framing practices, corners of exterior walls can be particularly susceptible to mold growth, because pockets of uninsulated space may allow cooler air to pool and condense. For a quick way to remediate the problem, use the instructions found here.

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spray foam spray insulation

Improve Your Sink

Insulate and soundproof an aluminum sink by spraying the underside with spray foam, paying particular attention to the gap between sinks. If you do this while the sink is installed, ensure you are wearing safety equipment and prepare the area beneath the sink for drips. Check out this, and other handy plumbing tricks here.

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Photos: Courtesy of Demilec

Shore Up Concrete Problems

Spray foam really is a magical tool for household insulation. Although fiberglass has been commonly used for insulation, spray foam can actually outperform it. Plus, with so many ways you can use spray foam, this material certainly is handy. Now only if it could help us out with all of those concrete problems…

Oh wait, it actually can!

Demilec, a company located in Texas, has invented a type of insulation foam that can help correct cracks and uneven pavement problems. Geolift can help to lift existing concrete surfaces and fix those problem areas around your house with much less labor. Geolift works for driveways, sidewalks, patios, garage floors, even pool decks. And yes, it is a foam, just like your beloved spray foam!

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Insulate the House

When it comes to insulating the house, fiberglass tends to be the most common form of insulation. However, when comparing fiberglass and spray foam insulation, you might be surprised that spray foam outperforms fiberglass. 

Spray foam is a type of insulation that expands after you spray. The foam expands and seals, deterring moisture (which can create mold) and pests from eating through your walls. It protects the lining of your house, and can even assist in the heating and cooling of your house during those unbearably cold or hot days.

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dfh17sep016_106467653 front porch urn planter fall pumpkins potCdrin/Shutterstock

Win at Decor

Porch urns or ceramic vases are an excellent way to add seasonal curbside flair to your home. However, tall items such as twigs, birch stems or even pumpkins can sway in the breeze and make a mess of your carefully planned decor. To prevent things from shifting, place your items in the container and spray around them with expanding foam to create a comfy nest that will keep items from blowing over and potentially breaking your urn. Place a layer of moss, hay or greenery on top to finish the look.

Plus: Easy ways to dress up a cheap planter.

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dfh17sep016_626606723 spray foam craft art project children miniature medieval mountainFamveld/Shutterstock

Get Crafty with Spray Foam

Expanding spray foam can be used to build mountains — albeit small ones—which is perfect for school projects or hobbies, such as model volcanoes or scenery for miniature train sets. For more crafty ideas, check out these easy to make Christmas ornaments.

See how to clean spray foam for multiple uses.