Ankeny Spray Foam Insulation
Open and closed-cell spray foam for Ankeny rim joists, crawlspaces, and attics. Air-seal and insulate in one pass, control moisture, meet Iowa energy code.
Ankeny Spray Foam Insulation that seals and insulates at once.
Spray foam is the tool for the spots where batts and blown fill fall short. It expands into every gap, cures into a rigid air barrier, and delivers its R-value and air seal in a single application. For an Ankeny home fighting a leaky rim joist, a damp crawlspace, or a cathedral ceiling that batts cannot seal, foam does in one pass what other materials need two steps to attempt.
Patriot Gutters & Insulation sprays both chemistries. Closed-cell is dense, gives the most R-value per inch, and acts as its own moisture barrier, which is why we lean on it for rim joists and crawlspaces in the central Iowa climate. Open-cell is lighter and expands further, a strong choice for attic roof decks and interior walls where you want the air seal without a vapor barrier. We are a Woodward gutter and insulation contractor working across the Des Moines metro, and Ankeny’s mix of new builds and older homes means we spray both regularly. The chemistry follows the assembly, not the sales pitch.
The advantage that matters in an Iowa winter is the air seal. Batts and loose fill slow heat but do nothing to stop the air movement that drives most of a home’s energy loss and its condensation problems. Foam stops the air and insulates in the same bead, which is why a foamed rim joist or an encapsulated crawlspace changes how the whole house feels and holds temperature. We spray to the thickness your assembly and the Iowa energy code call for, and we document the product and depth.
Open-cell and closed-cell, and where foam stops.
The two chemistries
Closed-cell foam cures dense and rigid at around 2 pounds per cubic foot, delivers roughly R-6.5 per inch, and its tight cell structure makes it both an air barrier and a vapor barrier. That combination is why we use it on rim joists and crawlspaces where you want the most R-value in a shallow cavity plus real moisture control against Iowa humidity. Open-cell is lighter and softer at about half a pound, gives roughly R-3.7 per inch, and expands much further to fill irregular framing. It air-seals just as well but stays vapor-open, which suits attic roof decks and interior walls where you do not want to trap moisture on one side.
Cost tracks the density: closed-cell uses more material per board foot and costs more, so the right call is putting closed-cell where its moisture barrier and R-per-inch earn their keep and open-cell where the extra reach and lower cost make sense.
Iowa code, blower-door, and where not to use it
Applied at the right thickness, foam meets the R-value and air-tightness targets in the Iowa energy code for climate zone 5, and because it seals so well it often moves the needle most on a blower-door test, the measured air-leakage number an energy rater checks. Sealing a rim joist and crawlspace can tighten a whole house measurably.
Foam is not the answer everywhere, and we will tell you when another material fits better. A wide-open attic floor is usually cheaper and just as effective in blown cellulose, so we save foam for the air-leak-critical spots: rims, crawlspaces, and roof decks. We also flag any active water intrusion first, because foam should seal a dry assembly, not bury a leak that needs fixing.
Same workflow on every Ankeny job.
Assess & spec
We inspect the rim joist, crawlspace, or attic assembly, pick open or closed-cell to fit, and spec the thickness the R-value target and Iowa code require.
Mask & protect
We mask off adjacent surfaces, protect finished areas, and set up ventilation so overspray stays contained and the cure window is controlled.
Surface prep
Surfaces are cleaned and dried so the foam bonds. Any loose old material is cleared and moisture sources are noted before a single bead goes down.
Spray to depth
Foam is sprayed in controlled lifts to the specified thickness, expanding into every gap and curing into a rigid air barrier that is also the insulation.
Trim & inspect
Cured foam is trimmed flush where needed, coverage is checked for gaps, and we confirm the thickness meets the spec across the whole area.
Document & sign-off
You get product documentation and the sprayed thickness in writing for code and resale, we clean the space, and we honor the manufacturer re-entry times.
The Ankeny spots foam fixes best.
Rim joists
The band around the top of the foundation is the number one air leak in a central Iowa home. A bead of closed-cell foam there seals and insulates it in one pass, killing the cold-floor draft that batts stuffed into the same cavity never actually stop.
Crawlspaces
Closed-cell foam on the crawlspace rim and walls seals out the humid air that drives condensation and mold. As part of an encapsulation it keeps ground moisture and outdoor humidity out, which is how you keep an Ankeny crawlspace dry through a wet spring.
Attic roof decks
Open-cell foam under the roof deck creates a sealed, conditioned attic, a strong option for homes with HVAC equipment or ductwork up there. It stops the attic from swinging with the outdoor temperature and pulls that space inside the building envelope.
Moisture control
Most moisture problems in an Iowa home are really air-movement problems: warm, humid air meeting a cold surface. Foam stops that air movement, so it addresses the cause instead of chasing the symptom with dehumidifiers and fans.
Questions Ankeny homeowners ask.
Open-cell or closed-cell spray foam for an Ankeny home?
Where does spray foam make the biggest difference in Ankeny?
Does spray foam really air-seal and insulate at the same time?
Does spray foam meet Iowa energy code?
Will spray foam help with moisture and mold in a crawlspace?
Is spray foam safe to be around after it cures?
Free spray foam quote.
Call and we will come out, inspect the assembly, and write a real scope for your Ankeny home. No deposit, no pressure. See finished work in our gallery or request the quote.