Dow

Dow makes professional-grade foam sealants that deliver specific R-values and fireblock ratings Montana contractors need for energy-efficient air sealing. The company operates as a materials science giant specializing in plastics, performance materials, coatings, silicones, and industrial intermediates.

For building contractors, Dow’s relevance boils down to two foam sealant products that solve real jobsite problems. Their Pro Gap & Crack delivers R-3.8 per inch insulation value, while ENERFOAM provides 0.26 per inch minimum. Both meet fireblock standards that matter for code compliance.

The Products That Matter: Professional Foam Specifications

Dow Pro Gap & Crack Foam Sealant expands minimally to fill gaps up to 3 inches, becomes tack-free in 3-10 minutes at 70°F, and reaches full cure in 1-24 hours depending on bead size. A single 24 oz can equals approximately 22 quart tubes of caulk — that’s serious coverage efficiency for contractors pricing jobs.

Specification	Dow Pro Gap & Crack	ENERFOAM
R-Value	R-3.8 per inch	R-0.26 per inch (minimum)
Coverage	14 sq ft at 1” thickness	712 linear feet (½” bead)
Expansion	Minimal (gaps up to 3”)	Minimal
Tack-Free	3-10 minutes at 70°F	6-20 minutes
Trim Time	Approx. 1 hour	30-60 minutes
Core Density	Not specified	1.01 pcf
Application Temp	40°F to 100°F ambient	Not specified
Service Temp	Up to 240°F cured	Not specified

ENERFOAM’s minimal expansion protects joint integrity — critical when you’re sealing around windows or doors where excessive expansion could bow frames. The foam stays flexible to accommodate structural movement, reducing callbacks from cracked seals.

Both products work for ICF forms, architectural foam applications, drywall installations, and pipe/HVAC penetrations. Pro Gap & Crack handles rim joists, sill plates, attic hatches, crawlspace openings, and outdoor fixture mounting.

Fireblock Ratings and Temperature Performance

Dow Pro Gap & Crack meets ASTM E84, ASTM E814 (modified), and carries UL 1715 Fireblock rating. Great Stuff PRO (Dow’s consumer brand) also carries ICC-ES Legacy Report No. NER-645 as a Type V residential fireblock penetration sealant.

Application temperature range runs 40°F to 100°F ambient (60°F to 90°F product temperature). In Montana terms, that’s workable from late April through October — matching the typical construction season. Once cured, the foam handles service temperatures up to 240°F — more than enough for the hottest Montana attic in August.

The foam provides water-resistant, airtight sealing that blocks insects, moisture, and allergens. ENERFOAM specifically lists insect blocking and reduced drywall nail-pops among its features — both common callbacks in Montana’s climate.

Pro products remain reusable for 30 days when attached to a PRO dispensing gun. No more tossing half-used cans. The foam is paintable, stainable, and sandable once cured — details that matter for finish work.

As a materials science company focused on performance materials and coatings, Dow brings industrial chemistry expertise to construction products. They’re recognized as a low-cost production leader with deep roots in materials science — which typically translates to consistent product quality at scale.

Skip these products if you’re just caulking a few gaps around the house. Regular caulk costs less and works fine for small jobs. But for whole-house air sealing, fireblock compliance, or any project where labor costs more than materials, professional foam sealants earn their price through speed and coverage.

Frequently Asked Questions

What’s the actual difference between R-3.8 and R-0.26 foam sealants?

Pro Gap & Crack at R-3.8 per inch provides meaningful insulation value for rim joists and larger gaps. ENERFOAM at R-0.26 minimum focuses on air sealing rather than insulation — perfect for narrow cracks where stopping air movement matters more than R-value.

How much coverage should contractors plan per can?

Pro Gap & Crack: one 24 oz can equals about 22 quart tubes of caulk. ENERFOAM delivers 712 linear feet of ½” bead per 24 oz can. For area coverage, Pro Gap & Crack covers approximately 14 square feet at 1-inch thickness.

Can these products handle Montana’s temperature swings?

Application range of 40°F to 100°F covers most of the construction season. Once cured, the foam handles up to 240°F — well beyond any temperature Montana can throw at it, including south-facing walls and dark roof decking.

What about that fireblock rating — is it actually required?

Both products meet ASTM E84, ASTM E814, and UL 1715 Fireblock standards. They’re classified as Type V residential fireblock penetration sealants. Many jurisdictions require fireblock-rated products for penetrations between floors and in certain wall assemblies. Check your local requirements.

How fast can contractors actually work with these products?

Pro Gap & Crack: tack-free in 3-10 minutes, trimmable in about an hour. ENERFOAM: tack-free in 6-20 minutes, trim-ready in 30-60 minutes. Both let you move fast compared to waiting for caulk to skin over.