Best Spray Foam Insulation for DIYers
Spray foam seals and insulates gaps, cracks, and cavities that batts cannot, stopping air leaks and drafts. Cans handle gaps around windows, doors, and penetrations; two-part kits insulate larger areas. Match the foam to the gap.
What to look for
- ·Use minimal-expanding foam around windows and doors so it does not bow the frame; use gaps-and-cracks foam for general sealing.
- ·A gun-grade can (with a foam gun) gives far more control and reusability than a straw can for bigger jobs.
- ·Two-component kits (Froth-Pak) cover larger cavities; they cure fast and need careful prep and protection.
Quick comparison
| Product | Tier | Price | Best for |
|---|---|---|---|
| DuPont Froth-Pak Two-Component Kit | Editor's pick | $40 to $120 per kit | Larger cavities and rim joists |
| Great Stuff Pro Gaps & Cracks (Gun-Grade) | Editor's pick | $8 to $15 per can | Controlled, reusable sealing |
| Touch n Foam Pro System | Editor's pick | $40 to $120 per kit | Pro-grade sealing |
| Great Stuff Gaps & Cracks | Best value | $5 to $9 per can | Everyday gap sealing |
| Great Stuff Big Gap Filler | Best value | $6 to $11 per can | Filling large gaps |
| Loctite Tite Foam | Best value | $5 to $10 per can | Durable value sealing |
| Great Stuff Window & Door | Budget pick | $5 to $9 per can | Windows and doors |
| Store-Brand Expanding Foam | Budget pick | $3 to $7 per can | Budget gap sealing |
| Basic Spray Foam Can | Budget pick | $3 to $6 per can | Lowest-cost quick fix |
Editor's pick
DuPont Froth-Pak Two-Component Kit
$40 to $120 per kit
A two-part spray foam kit that covers larger cavities like rim joists and big gaps, curing fast for serious air sealing. The pick for bigger DIY insulation jobs.
Best for: Larger cavities and rim joists
Typically available at Home Depot, Lowe's, Amazon.
Great Stuff Pro Gaps & Cracks (Gun-Grade)
$8 to $15 per can
A gun-grade can for use with a foam gun, giving precise control and reusability over weeks. The pick for controlled, efficient sealing on bigger projects.
Best for: Controlled, reusable sealing
Typically available at Home Depot, Lowe's, Amazon.
Touch n Foam Pro System
$40 to $120 per kit
A professional foam system with strong adhesion and coverage for sealing and insulating. The pick for a pro-grade alternative for larger sealing jobs.
Best for: Pro-grade sealing
Typically available at Home Depot, Amazon.
Best value
Great Stuff Gaps & Cracks
$5 to $9 per can
The everyday straw-can foam for sealing gaps, cracks, and penetrations around the house. A strong value for general air sealing and pest blocking.
Best for: Everyday gap sealing
Typically available at Home Depot, Lowe's, Amazon.
Great Stuff Big Gap Filler
$6 to $11 per can
A higher-expansion foam for filling larger voids and gaps in one pass. A good value when standard foam cannot fill the opening.
Best for: Filling large gaps
Typically available at Home Depot, Lowe's.
Loctite Tite Foam
$5 to $10 per can
A durable, uniform-cell expanding foam with strong adhesion for sealing gaps and cracks. A dependable mid-value alternative to the category leader.
Best for: Durable value sealing
Typically available at Home Depot, Amazon.
Budget pick
Great Stuff Window & Door
$5 to $9 per can
A minimal-expanding foam made to seal around windows and doors without bowing the frame. The right budget pick for trim-out air sealing.
Best for: Windows and doors
Typically available at Home Depot, Lowe's, Amazon.
Store-Brand Expanding Foam
$3 to $7 per can
A budget expanding foam for general gap sealing on a tight budget. Basic but serviceable for blocking drafts and small openings.
Best for: Budget gap sealing
Typically available at Home Depot, Lowe's.
Basic Spray Foam Can
$3 to $6 per can
The cheapest single-use foam can for a quick, small sealing job. Prone to clogging if not used at once, but the lowest cost to fill a gap.
Best for: Lowest-cost quick fix
Typically available at Home Depot, Walmart.
Frequently asked
What is spray foam used for?+
Sealing and insulating air leaks: gaps around windows and doors, plumbing and wiring penetrations, rim joists, and cracks where pests and drafts get in. It expands to fill irregular spaces that fiberglass batts leave open, which cuts drafts and energy loss.
What is the difference between the foam types?+
Minimal-expanding (window and door) foam expands gently so it will not bow frames. Gaps-and-cracks foam expands more to fill general openings. Big-gap foam fills large voids. Two-component (Froth-Pak) kits cover larger areas like rim joists. Match the foam to the gap size and location.
Open-cell or closed-cell foam?+
For the canned products most DIYers use, this is less of a choice, but in general closed-cell foam is denser, adds structural rigidity, and resists moisture (good for rim joists and damp areas), while open-cell is softer and cheaper for interior sound and air sealing. Large professional jobs choose between them by location.
Should I use a foam gun?+
For more than a can or two of work, yes. A gun-grade can plus a foam gun gives precise control, less waste, and lets you reuse the can over weeks. Straw-tip cans are fine for a one-time small job but tend to clog and waste foam.
Is DIY spray foam safe?+
Canned foam is DIY-friendly with basic care: wear gloves and eye protection, ventilate the area, and avoid skin contact (it is very sticky and hard to remove). Large two-part kits need more caution, a respirator, and protection. For whole-house spray foam, a professional installer is the norm.