In today’s changing world, energy efficiency is more important than ever. And having peace of mind that your commercial building project is energy efficient and ready to do its part in improving our world, is priceless.

At Cullen Insulation we work with builders and contractors across North Dakota, South Dakota, Minnesota, Northwest Iowa, Nebraska, Montana and Wyoming. We not only ensure their commercial buildings meet all the necessary specs and building codes for energy efficiency but surpass them. Our expert team of commercial building insulation contractors is committed to excellence in all we do, and it shows.

From office buildings, hospitals, military projects, water treatment plants, retail spaces, and university buildings (including libraries, law buildings, and union halls), no project is too small or too big. Throughout every insulation project we prioritize people, communication and accountability for our work. Keeping open communication with our customers ensures projects stay on track and are done right the first time.

A crew member from Cullen Insulation securing plastic vapor barrier sheeting over fiberglass batt insulation inside a residential construction wall.

All of our commercial insulation services are engineered to provide excellent energy efficiency, sound reduction, moisture regulation and all-around satisfaction. We’ve also gone the extra mile to earn Owens Corning® Certified Energy Expert ® status, giving you and your customers additional assurance that your insulation project is in good hands.

Commercial Services We Offer:

Air‑barrier membrane fully cured on exterior sheathing.

Air Barrier

We install a full range of self-adhered or fluid applied air barrier products that tightly seal the building envelope of your commercial project. These products limit air leakage and allow for an overall more energy-efficient space. They improve the air quality in commercial buildings and help keep moisture from spreading. Commercial air barrier installation is an important way to protect the integrity of your building. It also helps keep your electrical components dry for a safer structure.

Air Sealing

Eliminate the small gaps and penetration points leaking valuable air throughout your building project with air sealing. Count on our dedicated team to evaluate commercial building and provide the best air sealing solution for your project. Our air sealing products include caulking and spray foam insulation. Both products work to eliminate drafts, increase energy efficiency, and improve the indoor air quality of your structure.

Clear plastic vapor‑barrier sheeting stapled to interior wall framing, with a small bead of spray foam sealing an electrical wire penetration through the stud.
Close-up view of fiberglass batt insulation installed underneath an overhang on a residential construction project.

Fiberglass Insulation

Builders across our community have depended on this classic, budget-friendly insulation for many years. Whether you need batts or loose-fill, we have the product you need for your insulation project. Our installers count on the high-quality fiberglass products from our trusted suppliers, Owens Corning and Johns Manville. As an Owens Corning® Certified Energy Expert,® our team is trained in the latest fiberglass products and innovations.

Rigid Foam Board Insulation

Rigid foam board insulation acts as a weather-resistant barrier to enhance a building’s resistance to air and moisture. Ideal for exterior walls, we install both above-grade and low-grade rigid foam board for commercial buildings from Owens Corning and Johns Manville. Rigid foam’s lightweight panels can be cut to size to snugly fit any insulation project. Its durability, ease of use, and compatibility with other building envelope insulation materials makes rigid foam a smart choice. 

Interior of a residential basement under construction with rigid foam board insulation installed on all walls by Cullen Insulation.
Interior view of a residential framing project with spray foam insulation on the lower half of the walls and pink fiberglass batt insulation on the upper half, showcasing a hybrid insulation method.

Spray Foam Insulation

This expanding foam is the ideal solution for insulating and air sealing in one easy step. Commercial building owners will enjoy increased energy efficiency, lower energy bills, and better indoor air quality throughout their building envelope with commercial spray foam insulation. We install the fine products from BASF Spray Polyurethane Foam and Johns Manville. We offer both open-cell and closed-cell spray foam options to help meet local commercial insulation requirements.

Waterproofing

Help owners protect their new commercial building from the elements with our commercial waterproofing services, including a wide range of fluid-applied and self-adhered waterproofing materials. Waterproofing is most effective when applied to newly constructed exterior foundation walls. It can be used on concrete block walls, poured walls, ICF forms, tunnels, and elevator pits. Our expert team counts on the high-quality waterproofing products of leading manufacturers to ensure the best results.

Self‑adhered MEL‑ROL membrane applied to a foundation wall, creating a continuous air/vapor barrier before backfilling.

Builders Count on Cullen Insulation

Our standards and experience set us apart from every other insulation company in our community. From our start in Fargo, ND in 1988 to our expansive service area today, nothing has changed in the quality of our work or our customer service, only the innovation improvements of our products. Our team is highly educated in the ever-changing advancements in building science, and we are here to share our expertise with you. Ensure your commercial building project is maximizing its energy efficiency. Come see why local builders count on us for their commercial insulation services and solutions. Contact us today to learn more.