Insulation services in Williston, ND

Williston has two kinds of houses, and they need different things.

The first group is the pre-boom stock: houses built before 1980, a lot of them from the 1950s through the 1970s, scattered through the older streets near downtown and out toward the edges of what the city used to be. These tend to have 2x4 walls with thin or settled insulation, attics with a few inches of loose fill that has compacted over the decades, uninsulated rim joists, and basements that were never meant to be finished living space. The roofs are often low-slope or have shallow eaves, which makes attic access and ventilation a real consideration.

The second group came with the oil boom. Williston's population nearly doubled between the 2010 and 2020 censuses, and a large share of the city's houses, townhomes, and apartment buildings went up between roughly 2010 and 2015. That construction happened fast. Much of it is reasonable, but speed and a tight labor market left some of it with thin spots: batts stuffed around wiring instead of split, rim joists left bare, attic hatches with nothing on them, and band joists in townhome rows that were never sealed. A decade in, those houses are showing cold floors, ice dams, and furnaces that cycle hard in January.

For the older houses, the priorities are usually the attic (bringing it up toward the R-60 ceiling minimum that applies in our climate zone), the rim joist, and air sealing the top plates and penetrations before any new insulation goes in. For the boom-era houses, it is more often a diagnostic job: find the bypasses, fix the gaps, and add where the original crew ran thin.

Williams County sits in IECC Climate Zone 7, the coldest zone in the lower 48. Winters regularly run well below zero, and the cold rarely arrives alone. Williston is on open prairie above the Missouri River, with little to break the wind from the northwest. That matters for insulation in a way that a simple R-value number does not capture.

Wind drives air through a house. Every gap at the rim joist, every unsealed top plate, every open chase around a chimney or plumbing stack becomes a pathway once there is pressure behind it. Fiberglass batts and loose fill slow heat by trapping still air, so when the air inside them is moving, they lose a large share of their rated performance. This is why we talk about air sealing before we talk about adding inches. On an older Williston house, sealing the attic floor and the rim joist often does more for comfort than another foot of loose fill ever would.

The dryness cuts the other way. Dry winter air outside and humid air inside means vapor wants to move outward through the walls and ceiling. In Zone 7, that makes vapor control important, and it is part of why closed-cell foam (a vapor retarder at around 2 inches) is a good match for rim joists and crawl spaces here, while open-cell foam needs a separate vapor retarder in most of those same spots.

Williston is not only houses. The west side of town, where our shop sits, is thick with oilfield service yards, equipment shops, and metal buildings. North and east along US-2 and US-85 there are more of them, along with warehouses, truck shops, and ag buildings. Plenty of these went up during the boom as bare steel or post-frame shells with the intention of insulating later. Later is now.

A heated shop with an uninsulated steel roof sweats in winter. Condensation drips onto equipment, rusts the purlins, and in a cold snap the overhead door side of the building never gets comfortable no matter how hard the unit heater runs. Closed-cell spray foam against the metal stops the condensation by keeping the steel above the dew point and seals the laps and fastener penetrations at the same time. For a pole barn that will stay unheated or only gets heat a few days a year, foam is often more than the building needs, and we will say so.

We also do a fair amount of work on garages and additions. A detached garage that someone wants to heat for a winter project, a bonus room over a garage that never warms up, a basement finish that needs the walls insulated to the R-15 basement wall minimum before the drywall goes on. Those are everyday jobs for us.

Because our shop is in Williston, scheduling here is simple. Drew can stop by to look at a job on the way to or from another one, and there is no trip to plan around. Small jobs (a single rim joist, an attic hatch, a crawl space) fit between larger ones. Larger jobs get a dedicated day or more.

We quote after seeing the building, not from a phone description. It takes longer, but a quote built on the actual rafter depth, the actual rim joist condition, and the actual access to the attic is a quote that holds. Send a quote request with the address and a few notes about the building and we will get back to you to set a time.

Spray foam earns its place in Williston on a few specific assemblies: rim joists in the older houses, where a couple of inches of closed-cell foam seals and insulates a spot that is nearly impossible to do well with batts; crawl spaces and basement walls, where the vapor retarder matters as much as the R-value; and the metal shops and steel buildings on the west side, where foam against the roof deck stops condensation. For attics and standard wall cavities, blown-in or batts usually do the job for less, and we will tell you that before we bid. Read more on our spray foam insulation page.