Crawl space insulation in Jerome ID - warm floors over a dry crawl space

Cold floors, or a crawl space nobody's looked in for years? We check what's down there first, then insulate the floor or the walls.

Cream spray foam covers the underside of a roof around exposed wooden rafters and a metal duct.

Crawl space insulation in Jerome, IDstarts with a look underneath

Thick white spray foam covers a crawl space wall beneath exposed wooden beams, beside a brick support and plastic ground sheeting.
A crawl space has pink insulation between floor joists, exposed ductwork, and a white vapor barrier covering the ground.

Cold floors in winter, or pipes under the house you worry about, usually point to the crawl space. Crawl space insulation goes one of two places, in the floor over a vented crawl space or on the walls of a sealed one, and done right it keeps the floors warmer and helps keep pipes and ductwork from freezing.

At Steady Jerome Spray Foam Insulation, we look at the whole space before picking one, because closing the vents by itself can cause new trouble. That means the vents, any damp spots and whatever equipment lives down there. Then we decide with you whether to insulate the floor above or seal the space and do the walls.

The price mostly turns on the square footage, which of those two approaches fits your house, and how much room there is to work down there. Anything that has to be fixed first, like a leak or old insulation hanging loose, adds to it, and the schedule waits on those fixes and any permit.

I'll show you what's under your floor before we suggest anything, so call (208) 544-9045 and we'll set up a visit.

Where crawl space insulation goes

No two crawl spaces are set up quite the same, so we fit the job to how yours is built, whether it's vented, and what pipes and equipment run through it.

  • Floor over a vented crawl space

    If the vents stay open, we insulate the underside of the floor and seal the gaps in it, because any gap lets cold air sit right under your rooms.

  • Walls of a sealed crawl space

    When the space is sealed and kept dry, rigid foam board goes on the foundation walls and the floor above needs none. That's different from the house's wall insulation, which is its own job.

  • Rim joists

    The rim joists are the boards sitting on top of the foundation around the edge, and we seal and insulate them as part of our air sealing services so the air barrier runs all the way around.

An open garage has blue spray foam insulation between wooden wall studs, with the concrete floor and garage door visible.

Why Jerome homeowners call Steady Jeromefor the space under the house

I'd rather you understand your crawl space than just take my word for it, so we explain what we find and why before anyone picks up a tool.

  • The owner looks at your crawl space

    I come out myself to look at the crawl space with you, answer your questions and write the estimate, so the person explaining the job is the one responsible for it.

  • Repairs before insulation

    A leak, a wet spot or bad wiring goes at the top of the plan, because insulation laid over any of them just hides the problem until it gets worse.

  • Our own installers, checked by me

    Our own installers do the work, and I check it and walk the finished crawl space with you when it's done. Satisfaction guaranteed.

  • Licensed and insured under your house

    We're licensed and insured, which matters in a crawl space, where our crew spends the day working around your pipes, wiring and ducts.

  • Back in the trade since 2021

    I ran insulation jobs when I was younger, left for years, and came back in 2021 because I missed the work, so we've been at it five years now.

Get a crawl space insulation planfor your Jerome home

Tell us your crawl space's rough square footage, whether it has vents and what equipment sits down there. We reply within one business day to set up a free estimate at your home, with no obligation.

From first callto a finished crawl space

We keep it simple by putting it all in writing up front, with photos of what we found and the order we'll do the work in.

  1. Call or send a note

    Call (208) 544-9045 or use the form and tell us what's going on, like cold floors, drafty rooms or pipes that froze last winter, and we'll set up a time to come out.

  2. I look underneath with you

    I go over the crawl space with you, take photos, and check the vents, any wet spots and the equipment down there, then write up a plan with any fixes at the top.

  3. We pick the approach together

    We decide with you whether to insulate the floor or seal the space and do the walls, and once you say yes, we sort out the permit question with the right office.

  4. Our crew works in order

    Our installers start with whatever the plan put first, then seal the gaps and put in the floor or wall insulation the way we agreed on.

  5. Cleanup and walkthrough

    We clean up the crawl space, and I check the work and go through it with you, so you can see what's down there now and judge it yourself.

Crawl space questions

Can I just close the crawl space vents on my house?

Not by itself, because closing the vents alone can raise the moisture down there. If a gas furnace or water heater in the crawl space takes its air from the space, sealing it up can also create a deadly situation. That's no reason to panic, just the reason we look at the whole space and everything in it before we close anything.

What is the best way to insulate a crawl space, the floor or the walls?

If the crawl space stays vented, insulate and air seal the floor above it, and if you seal the space and keep it dry, put rigid foam on the foundation walls and leave the floor alone. Over a vented space, gaps in the sealing and insulation are what give you cold floors and a higher power bill, so we seal the rim joists too. When the furnace or ducts live down there, I usually lean toward sealing the space and doing the walls, since that brings them inside the warm part of the house.

How much does crawl space insulation cost per square foot in Jerome?

Across the US, insulating a crawl space usually costs about $3 to $6 per square foot, and that's the general market range, not our price. Where your job lands depends on floor versus walls, how tight the space is and whether anything needs fixing or drying out first. Your estimate gives you our number for your crawl space.

Who issues building permits for crawl space work in Jerome, ID?

The City of Jerome's Building Safety Department issues residential permits and handles plan review and inspections, and Jerome County requires a permit before any construction. The city's list names remodels but not crawl space insulation, so whether your job needs one isn't settled ahead of time, and which office covers you depends on your address. We check with that office, and if a permit's needed we handle the application and set up the inspections.

How do I keep a sealed crawl space dry?

Give it a steady way to dry out, and one of the most effective is a little conditioned air from your home's heating and cooling system. A sealed crawl space should be heated and cooled like part of the house, so plan for that from the start. Tying it into your HVAC may need its own permit from the State of Idaho, which can require one for HVAC work.

Is foam board insulation in a crawl space safe?

It can be, as long as it's the right product and covered where the code calls for it, because some foam gives off toxic or flammable gases when heated. Most codes require a barrier over foam, usually drywall, and some foam products are made and tested to cut that risk. It's fair to ask any crew which foam they plan to use and to check with local authorities that it meets code.

Crawl space insulation around Jerome

We're based in Jerome and also work in Twin Falls, Kimberly and other cities nearby, where we see plenty of vented crawl spaces with ducts and water lines running through them. Pick your area below or give us a call.

Book a crawl space insulation estimate in Jeromewith the owner on site

Even if you decide not to go ahead, you'll come away with photos of your crawl space and a written plan that shows what needs attention first. Call (208) 544-9045 or send the form.