9 Best DIY Closed-Cell Spray Foam | R-Value Truth Nobody Prints

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Twelve 29-ounce cans and a gun that punches far above what it costs.

Each can is 29 oz and covers up to 20 board feet at one inch of thickness — board feet meaning one square foot sprayed one inch deep, the standard unit foam is sold by. The kit ships with 12 cans, the applicator gun, and a can of foam cleaner, plus a hose and a 45-degree elbow connector for overhead or tight spots.

The R-value is 5.66 per inch, and the foam sticks to wood, brick, stone, concrete, metal, drywall, and OSB — so it suits walls, attics, basements, foundations, trailers, RVs, boats, and sheds. For anyone doing one-part sealing on a single structure, that is a broad usable range without buying a second product.

A 10-year installer with 1,000+ cans of experience rebuilt a rotting door frame with less than one can and called the foam and gun impressive. The catch is consistency: one buyer who ordered three 12-packs for a crawl space got one pack with spurting cans and poor coverage, so inspect every can before you commit a whole afternoon.

Application is where the learning curve lives — warm the cans to 85°F, keep the substrate above 70°F, and shake each can hard before spraying. Lay it on in thin layers an hour apart and hit cracks first.

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Fire-rated closed-cell foam for sheds and porches — just bring your own gun.

The 12 cans are rated to 240 sq.ft. at 2 inches, with an R-value of 11.32 at that thickness, and the whole lot weighs 26 pounds as delivered — light enough to carry up a ladder in one trip and heavy enough that you will notice it by the end of the day.

What makes this kit stand out is the nozzle setup. It ships with two interchangeable nozzles — Nozzle A for vertical walls and surfaces, Nozzle B for ceiling work. The foam is Class-A fire rated and tested to ASTM E84, adheres to drywall, wood, concrete, plaster, stucco, brick, sheetrock, glass, carbon fiber, MDF, metal, PVC, and OSB, and stays dimensionally stable so it will not warp window or door frames.

Here is the honest split: people who use this well love it, and people who do not, do not. One buyer insulated an entire shed and came back for more when the porch needed doing — the only warning worth repeating is that overhead work means a full suit, because missed beard coverage got trimmed off with scissors. A former spray foam professional flagged it as the cheapest option for small jobs, versus a professional truck minimum well into four figures.

Where it frustrates is consistency: one reviewer noted losing more than half their material and getting roughly 160 board feet from 24 cans, and another found two cans dead on arrival. Treat the advertised coverage as a target, not a promise, and order roughly 40% extra.

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A full 12-can setup with a real gun and enough gloves to finish the job.

Twelve 27.1 oz cans rated to 240 sq.ft., a Class-A fire rating tested to ASTM E84, and an R-value of 11.32 at 2 inches. Thermal conductivity sits at 0.025 W/m·K — meaning heat crosses the material slowly — and the foam is built to eliminate thermal bridges and dew points while quieting noise transmission.

The kit itself is generous: 12 cans, one foam cleaner, one dispensing gun, eye protection, and 12 pairs of gloves, so you are not hunting for PPE the morning you start. It has two interchangeable nozzles, one for vertical surfaces and one for overhead or ceiling work, and layered application gets you up to 5 cm of thickness.

among the most useful details in the whole listing is the temperature guidance. Bring the can to 68°F before you spray; the foam performs well between 41°F and 86°F, so in a cold environment you simply let the can sit indoors until it warms up. That single habit decides whether your bead is smooth or lumpy.

The trade-off to go in with eyes open: a whole metal building runs long. One owner insulated 1,684 sq.ft. of walls and ceiling at 2 inches with 186 cans and reported no problems across the order. But another found the foam simply did not expand the way the label promised and called the coverage claim a lie.

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The 12-can starter box for a first-time sealer who wants support on the phone.

The highlight number is the fire rating. This kit was tested to ASTM E84 and achieved a Flame Spread Index of 0 — meaning flame barely propagates across the surface in that test — with a Smoke Developed Index of 120, which meets Class-A surface-burning criteria. Thermal performance is an R-value of 8.24 at 2 inches of thickness.

It is a hybrid moisture-cured polyurethane formula, so it bonds to wood, metal, drywall, concrete, and brick once cured, and it resists water absorption with short-term absorption tested under EN 1609. That combination of adhesion and water resistance is what you want in a basement or crawl space where damp is part of the problem.

Everything arrives in one box: 12 cans, a heavy-duty applicator gun, a solvent-based cleaner, gloves, goggles, and a coverall. Where a lot of these kits leave you ordering PPE after the fact, this one does not. The gun, cleaner, and controlled expansion are what owners praise most — one used the whole kit in a garage-door remodel and reported no lingering chemical smell and a cleaner that stopped the gun clogging.

The catch is the coverage claim. One detailed owner found that a pack advertised at 240 board feet delivered roughly 164 sq ft at an average depth of 1.75 inches rather than the advertised 2, which meant a second pass and 20 cans in total. If your job is anything beyond a garage wall or a few rim joists, size up.

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A 12-can kit built for garage doors, walls, and slanted-roof ceilings.

The 12 cans are rated to 240 sq ft and an R-value of 5.66 per inch, with a Class-A fire rating tested to ASTM E84. Coverage is listed at 20 sq ft per can — so a whole ceiling needs more than one pass, and the ceiling nozzle for a slanted roof is not a nice-to-have.

The kit includes 12 cans, an ergonomic application gun, foam cleaner, safety goggles, a worksuit, and gloves — a complete setup from the start. Once cured, the polyurethane creates a watertight, airtight seal that blocks pests and drafts and adheres to most building materials. Bring the can to 68°F before spraying. The application window runs from 41°F to 86°F, so in a cold climate you let the can sit indoors and warm up.

The gun is the star of this kit. One semi-retired builder with a 300-board-foot job at 2 inches called it easy after a short practice run, said the gun cleans in seconds, noted low odor, and reported overspray that peels off with a scraper. A first-time user with no prior spray foam experience found each can includes two spray tips and gloves, and swapped tips rather than worrying about clogging.

What to watch: consistency. Some kits ship with cans that will not spray at all — one project lost 5 of 12 cans to defective or expired product — and another buyer noted the foam lands lumpy with large bubbles in joist cavities instead of filling uniformly. Order more than you need and inspect each can before you start.

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Eighteen cans, a Teflon-coated gun, and a full set of nozzles in one box.

This is the largest single-can count on the list at 18, each can holding 25.4 oz. Full cure time is 24 hours — meaning you let the foam set for a day before trimming or molding it — and the same window is your deadline for wiping residue with the cleaner before it hardens. Adhesion covers wood, metal, concrete, brick, PVC, OSB, drywall, plaster, glass, and more.

The package contents are genuinely thorough: 18 cans, an 18-pack of red nozzle (1-2), two short and two long gun nozzle tips, 18 can nozzles, a Teflon-coated spray gun, a foam gun cleaner, coverall, goggles, nitrile gloves, a safety mask, and a user guide. That Teflon coating is what makes the cleaning step easier after the gun has been sitting between coats — if you own a spray gun for this kind of work, you know how fast uncoated ones gum up.

Spray from roughly 25 to 30 cm away from the surface for the smoothest layer — too close and the bead dislodges, too far and it lands uneven. The foam cures fast and expands to fill gaps and cracks, and the red tips can be cleaned by soaking them in soapy water so they pop free for reuse.

The downside worth knowing is consistency of adhesion. Reports run from clean application to poor stick, and one buyer found the covers fell short of the advertised area while a second found the seller went quiet after a partial replacement shipment. Two owners flagged poor ceiling application specifically. If your job is mostly walls and floors, you will not miss it.

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The 24-can, 53-pound box for a full attic rather than a patch.

Coverage is the whole story here. This is the 480-board-foot version of the BEEST FullStop kit, with 24 cans rather than the 12 the smaller kit carries — and it is set apart from the STANLEY kit’s 24 cans by what is in each one. Same fire profile too: tested to ASTM E84 with a Flame Spread Index of 0 and a Smoke Developed Index of 120, meeting Class-A surface-burning criteria, and an R-value of 8.24 at 2 inches.

The formula is a moisture-cured hybrid polyurethane, so once cured it bonds to wood, metal, drywall, concrete, and brick, and it resists water absorption with short-term uptake tested under EN 1609. The whole box weighs 53.2 pounds as delivered — plan the trip from the truck, not just the trip up the ladder.

It ships with everything: 24 cans, two cans of foam cleaner, a heavy-duty applicator gun, gloves, goggles, and a coverall. The gun, the cleaner working as advertised, and the absence of a lingering smell after curing are what owners talk about — one used it in a home remodel and reported positive results with no complaints about fumes.

What you should know before buying: the coverage claim is real but demanding. One careful attic owner found the kit delivered roughly 164 sq ft from the first half of their cans at an average depth of 1.75 inches rather than the advertised 2, and needed 20 cans for a double pass. The seller compensated. Plan for a margin.

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A two-component kit with a 9.5-foot gun hose and a genuinely low-GWP formula.

This is the only two-component kit in the group — meaning two liquids mix at the gun and cure into a dense, rigid 2 lb. foam instead of relying on a single can to push foam out. Coverage is up to 200 sq.ft. at 1 inch thickness, with an R-value of R-7 per inch, and it cures quickly into an airtight seal that doubles as a vapor and moisture barrier. Its low-global-warming-potential formula ships to all U.S. states.

The kit ships with a 9.5-foot gun and hose assembly, safety coverall, safety glasses, four fan tips, and four cone tips — you can change the tip to suit the surface rather than forcing one nozzle to do everything. Warm the canisters to 75°F to 85°F before you start.

What buyers consistently value is the quality of the finished job and the coverage that meets or beats the label — this kit adheres well, creates a strong bond to metal panels and wood studs, and cures quickly. One owner sealed and started moisture-barrier work in a crawl space with two kits and reported that everything worked as claimed, with the extra nozzles and the included suit and goggles making the day easier.

Where it takes planning: the first-generation gun on early units caused foam seepage and waste for one buyer, though the seller replaced the unit and the second gun worked cleanly with even coverage and minimal waste. Use petroleum jelly on the threads and swap nozzles often, and buy more than you need to avoid running dry mid-job.