01Save energy
Lower energy bills
Closed-cell foam fills every gap, so the air you pay to heat or cool stays inside.
4.8/5 from 5,000+ DIYers
Stop paying to heat the outdoors.
Pro-grade closed-cell spray foam you can apply yourself. Seal drafts, block moisture and lock in comfort in a single afternoon.
- Each kit covers up to 240 sq.ft
- Class A fire rated, zero flame spread
- Everything included, no rental rig needed
4 reasons to seal With Amptern
02Any surface
Bonds to almost anything
Wood studs, metal panels, concrete block. One kit handles the mixed surfaces in real buildings.
03No guesswork
Buy exactly what you need
Measure once, get a kit count in seconds, and skip the extra trip to the store.
04Fire rated
Safer by design
Class A fire rated with zero flame spread, and safety gear is included in every kit.
AMPTERN HYBRID CELL ARCHITECTURE
Meet the foam behind the comfort.
Closed-cell outer skin
Fills awkward gaps
R-3.70 per inch
Adds rigidity
SHEDS TO BASEMENTS
Four surfaces. One kit.
PICK YOUR COLD SPOT
Where will you start?
Real projects sealed with Amptern. Tap a category to filter.
What customers are noticing
Based on a customer survey. Update these to match your own data.
82%
lower energy bills
The room held heat or cool air noticeably better.
85%
Reduced Air Drafts
Seals Air Leaks Around Doors, Walls & Rim Joists
98%
Easy to apply
First-time users who found the kit simple to use.
90%
Would recommend
Would recommend Amptern to a friend.
YOUR FIRST SPRAY JOB
First time spraying?
No experience needed. Four steps and you're sealed.
Step 1
Warm the cans.
Clean off dust and grease and cover anything you don't want foamed.
Step 2
Lightly mist.
Mist the surface with water before spraying. Keep it lightly damp, not soaked. Follow the can instructions.
Step 3
Spray thin passes.
Build up in light layers and let the foam expand and cure.
Step 4
Let it cure.
Ventilate. Wait 24 to 72 hours.
Class A fire rated.
Zero flame spread, so you can insulate with confidence.
What Class A means
Class A is the highest flame spread rating for building materials. It means the cured foam resists the spread of fire across its surface.
Where it matters
Garages, workshops and attics often hold tools, fuel and wiring. A fire-rated foam adds peace of mind in those spaces.
Safety gear included
Every kit comes with gloves, goggles and a coverall so you're protected while you spray.
FROM THE AMPTERN COMMUNITY
Real customers. Real results.
★★★★★
Robert M.
Class A Fire Rating Gave Me Total Peace of Mind
"Used this on a commercial project requiring ASTM E84 compliance. Passed inspection with flying colors and stuck firmly to both concrete and metal."
Robert M.
★★★★★
Armstrong Montgomery
Great for Sealing Drafty Areas
“I used this kit around several basement pipe penetrations and old window frames. The foam expanded evenly and sealed every gap. Our basement feels noticeably warmer now. Easy to use even for a first-time DIYer.”
Armstrong Montgomery
★★★★★
Dominic Nico
Clear beginner instructions
”I’ve zero DIY construction experience, but the step-by-step guide made spraying straightforward. The foam expands at a steady rate so I never overfilled cracks accidentally. Shipping arrived well wrapped with zero leaks.“
Dominic Nico
★★★★★
Jason terry
DIY-Friendly
“As someone with very little home improvement experience, I was nervous about using a foam kit. Turns out it was much easier than expected. The included accessories made the process simple and stress-free.”
Jason terryHOW MANY CANS FOR MY JOB?
Know your kit count before buying.
YOUR AMPTERN KIT
One order. Everything to finish the job.
1 / 10
REAL DIYERS, REAL PROJECTS
Watch it go on. One can at a time.
Tap a video to play. Sound is off until you turn it on.
Got questions? Get clear.
How much does one kit cover?
About 240 sq ft at 1 inch thick. Use the calculator above for a recommendation based on your project.
Do I need experience?
No. The kit is designed for first-time DIYers and includes the gun, cleaner and safety gear.
What surfaces does it stick to?
Wood, metal, concrete and most common building materials. Surfaces should be clean and dry.
How long does it take to cure?
The foam is tack-free quickly and fully cures within a day, depending on temperature and humidity.
Is it fire rated?
Yes. The foam is Class A fire rated with zero flame spread.
What if I'm not happy?
You're covered by our 30-day money-back guarantee.