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Closed-cell spray foam delivers R-6 to R-7 per inch, acts as a vapor retarder, and seals air leaks all in one product - making it the correct specification for exterior walls, crawl spaces, and rim joists in a Climate Zone 6 home.
Closed-cell spray foam insulation in Mandan, ND is a two-component polyurethane product applied as a liquid that expands and cures to a rigid, dense foam. The cells in the material are sealed shut - which is what distinguishes it from open-cell foam and gives it a set of properties that are particularly well-suited to cold-climate construction.
Where open-cell foam is soft, permeable to moisture, and delivers around R-3.7 per inch, closed-cell foam is hard, acts as a Class II vapor retarder, and delivers R-6 to R-7 per inch. In a North Dakota wall assembly, those differences matter significantly. Exterior wall cavities, rim joists, crawl space walls, and any surface adjacent to frozen soil or the cold outdoors should use closed-cell foam to prevent moisture condensation in the assembly. You can see how closed-cell foam fits into a complete project on our spray foam insulation page.
The Spray Polyurethane Foam Alliance publishes installation standards and best practices we follow on every closed-cell job.
Closed-cell foam delivers roughly double the R-value per inch compared to open-cell foam or fiberglass batts, making it the best choice where space is limited and maximum thermal resistance is needed.
The sealed-cell structure acts as a Class II vapor retarder, slowing moisture movement into cold wall cavities. In a North Dakota climate, this is not optional in exterior walls and crawl spaces - it is the correct specification.
Closed-cell foam fills every gap and crack it contacts, sealing air infiltration as it insulates. No separate air barrier or vapor barrier layer is needed in the areas it covers.
Unlike batts or blown-in products, closed-cell foam cures to a hard material that bonds to the substrate. It does not settle over time, absorb moisture, or compact under load.
Closed-cell foam is not the right product for every location - but in the areas where moisture control and high R-value per inch both matter, it is the correct specification for a North Dakota home. We assess your specific situation and recommend the right product for each area.
The single highest-priority location in most older Mandan homes. Closed-cell foam seals and insulates the rim joist cavity in one step with no separate vapor barrier required.
Closed-cell foam on crawl space walls and sill plates closes the most common source of cold air under your floors.
In walls where depth is limited and maximum R-value per inch is needed, closed-cell foam outperforms any batt product at the same thickness.
Applied to the underside of roof decking in unvented attic assemblies, closed-cell foam stops ice dams and keeps conditioned air in the living zone.
We ask about the areas you want to insulate, the age of your home, and any moisture history in the basement or crawl space. We schedule an on-site visit within one business day.
We assess rim joists, crawl space walls, exterior wall cavities, and any other target areas. You receive a written quote specifying foam type, installed thickness, coverage area, and total cost.
The crew arrives with heated tanks and spray equipment. Two-component closed-cell foam is applied to the specified areas. Occupants need to be out of the home during application and for roughly 24 hours afterward.
We walk through the completed areas with you. Closed-cell foam has a distinctive hard, yellowish appearance that you can inspect in open areas. Any gaps or missed coverage are addressed before the crew leaves.
We respond within 1 business day. There is no obligation - after you submit, someone from our office will call to schedule a free on-site estimate. We assess your specific areas, confirm the right foam type and thickness, and give you a written quote before any work begins.
(701) 291-0855Mandan Insulation is licensed in North Dakota and carries full liability coverage on every job.
We specialize in closed-cell applications for Climate Zone 6. We will not substitute open-cell foam where closed-cell is the correct specification without a clear explanation of the trade-offs.
We come to your home, assess the specific areas and conditions, and provide a written quote before any work begins.
We are a local business with direct experience in the thermal and moisture conditions specific to the Bismarck-Mandan area.
See the full range of spray foam applications for Mandan homes - both open-cell and closed-cell - matched to each area of your home.
Learn MoreClosed-cell foam is the go-to material for rim joists and upper foundation walls. See how it fits into a full basement insulation project.
Learn MoreCall today for a free on-site estimate. We respond within 1 business day, assess your specific areas, and give you a written quote before any closed-cell foam work begins.