Air sealing services in Bismarck ND - fewer drafts and warmer rooms upstairs
Drafty rooms, a cold upstairs or a power bill that keeps climbing? We find the hidden leaks, fix what's wrong first, then seal them.
- Licensed and fully insured.
- Free in-person estimates.
- We respond within 1 business day.
Do I need air sealing, or just more insulation?
Our air sealing services in Bismarck, ND close the gaps where heated air slips out of your house, around pipes, wires, vents, ducts and fans and through the attic floor, so rooms stop feeling drafty and your insulation can finally do its job.
Most people call because a room won't stay warm or the power bill keeps going up, and the leaks behind it are usually up in the attic, buried under the insulation where you'd never spot them. The price moves with how many leaks there are, how easy the attic is to get around in, whether anything up there needs fixing before we seal, and whether old insulation has to come out through insulation removal before anyone can reach the gaps. The schedule turns on that same list and on whether the city wants a permit, and once I've looked, the written estimate tells you what we'd do and why.
Is air sealing right for your house?
Drafts you can feel
If you feel cold air around outlets, the attic hatch or baseboards, leaks are letting it in.
Hot upstairs, cold floors
A hot upstairs and cold floors below usually mean warm air is escaping out the top.
The room over the garage
That room often runs cold because outside air works in around its floor and walls.
A power bill that climbs
A heating bill that keeps rising with no change in habits often points to leaks you can't see.
How our air sealing services work
Before any sealing starts, I go through the attic with you looking for old wiring, roof leaks and bathroom fans that blow into the attic instead of outside, and we get those handled first, because sealing over them just hides the problem. Then our crew works across the attic floor, closing the gaps around pipes, wires, vents, ducts, fans and the hatch with sealant, one-part spray foam or rigid blocking, whichever each gap needs. Early on, I'll also talk with you about fresh air, because a house that's sealed up tighter may need mechanical ventilation added, a fan system that brings outside air in.
Drafts don't all start in the attic. Cold floors often come from lower down, where we can seal the gaps and follow up with basement insulation, and where a spot needs to stop air and moisture at once, like the wood sitting on top of the foundation wall, we use closed-cell foam insulation, a dense foam that does both.
Sealing on its own
This suits a house whose insulation is in decent shape but still feels drafty, because we seal the gaps and settle the insulation back where it was. It's the lighter job, and often the one that does the most for what it costs.
Sealing with an insulation top-up
This suits an attic that's thin on insulation or getting new insulation anyway, so you book one job instead of two. We seal first, then add blown-in insulation, loose fill blown through a hose, over the top.
What happens after you call us about air sealing?
Call or send the form
Call (701) 299-5007 or use the form and tell us what you're noticing, like a cold room or a hot upstairs. We'll set a time for me to come out to the house.
I look it over with you
I go through the attic and the rooms that bother you, take photos and show you what I found, what should be fixed first and what can wait. Then you get a written estimate that says what we'd do and why, so you can decide what's worth it before you spend anything.
We fix, seal and walk through
We start with anything the visit turned up, seal before any insulation goes in, and I'm up there alongside our installers. Before we pack up, I walk you through the finished work.
Air sealing with foam, or seal and top up?
Sealing and topping up usually wins, unless ducts are up there.
Spray foam across the whole attic costs more, and it seals air while it insulates. For most attics I'd rather seal each gap with sealant, a little foam or blocking, then top up the loose fill, because you get most of the benefit for a good deal less money.
The exception is ductwork running through the attic. Those ducts sit out in the cold, so burying them in foam can be worth the extra cost. If yours are up there, I'll point them out on the visit and we can price it both ways.
Examples of insulation work
Look through these examples of insulation and air sealing work to get a feel for how attics, walls and crawl spaces look when finished.
Get a free look at where your house leaks air
Tell us which rooms bother you and whether you've seen vermiculite, a roof leak or a bathroom fan venting into the attic. We reply within one business day to set up a free on-site estimate, with no pressure to book.
Why Bismarck homeowners call Pinnacle Bismarck Spray Foam Insulation for air sealing
I do every estimate myself
I come out, look the space over with you, and I'm on the job alongside our installers. The person who explained the plan is the one making sure it gets done that way.
Licensed and fully insured
That covers your house and our crew while we're working in your attic. Ask to see it on the visit and I'll show you.
Honest answers since 2023
I started this business in Bismarck in 2023, and I'd rather tell you your attic is fine than sell you work it doesn't need. Call (701) 299-5007 or send us the form and I'll come take a look.
Air sealing questions we hear
Can I seal air leaks in my house myself?
You can handle the obvious leaks yourself, like gaps around door frames, but the small, hard-to-find leaks in the attic under the insulation are a different job. Those take digging through insulation and knowing where to look, so most owners do the easy gaps and get help with the attic.
What should I do if my attic has vermiculite insulation?
Get professional advice and have it tested before anyone seals or insulates over it, because vermiculite may contain asbestos. Testing is a different trade, so if I spot it on the visit I'll tell you, and the sealing waits until you know what you're dealing with.
How much does air sealing cost in Bismarck?
Weatherization work like air sealing usually costs about $550 to $5,000 per project in Bismarck. Where your house lands depends on the things covered up top, mostly how many leaks there are and what needs fixing first, and our estimate is done in person and sent to you in writing. Every job is backed by our satisfaction guarantee.
How do I find where my house is leaking air?
Start by feeling for drafts at doors, outlets and the attic hatch, but the bigger leaks usually hide in the attic floor under the insulation. Certified home energy assessors find those with a blower door test, a big fan that pulls air through the house so leaks show up, and thermal camera images, and it's fair to ask any contractor which tools they use. On my visit I take photos of what I find so you can see it for yourself.
Should I seal my soffit and ridge vents to stop drafts?
No, leave them open, because soffit, ridge and gable vents and combustion air ducts are meant to move air and only work when nothing blocks them. We seal the leaks from your living space into the attic and keep those openings clear.
What is the best way to air seal an attic before adding insulation?
Seal the openings in the attic floor first, then add the insulation, because once it's down those gaps are buried and hard to reach. If you're planning new attic insulation, it makes sense to schedule both together with the sealing done first.
Want to know where your house leaks?
I'll come out, look the attic over with you, and send a written estimate that says what we'd do and why.
Work that often goes with it
What Bismarck's rules mean for air sealing services
In Bismarck and the stretch just outside city limits that the city also covers, permits go through the city's Building Inspections Department, and the city doesn't allow construction to start without one. Whether sealing an attic needs a permit isn't something I'd guess at, so before we start we check with that office, and when it does, we handle the application and wait for the permit to be issued before we begin. If your house needs fresh air brought in once it's tighter, that's mechanical work, and the same office licenses mechanical contractors.
North Dakota's Secretary of State requires anyone doing a job that costs more than $4,000 to be licensed as a contractor in the state, so it's worth asking on a bigger project. We're based in Bismarck and see the same leaks around hatches, pipes and fans on jobs across Bismarck, in Mandan and in the other cities around them.