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Cullen Insulation Cullen Insulation
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Business Details
38 Years
experience
Expert Insulation Solutions for Residential & Commercial Buildings
Cullen Insulation has been a trusted name in the insulation industry since 1988, dedicated to delivering high-quality solutions with integrity. Our team of experts specializes in residential, commercial, and multifamily insulation, utilizing advanced building science to meet unique energy efficiency needs. With six locations across North Dakota, South Dakota, Montana, and surrounding regions, we prioritize customer relationships and community impact. Our commitment to excellence is reflected in our use of premium materials from trusted suppliers like Owens Corning and BASF.

Over three decades of experience, including leadership transitions from founder Terry Cullen to current owners Dan Frisch and Eric Brutger, underscores our enduring focus on quality craftsmanship. We emphasize open communication, tailored solutions, and sustainable practices to ensure long-term comfort and energy savings for every client. Our involvement in initiatives like the Cullen Children's Foundation demonstrates our dedication to both professional and community growth.
Services
Spray Foam Insulation Fiberglass Insulation Air Barrier Installation Exterior Waterproofing Commercial Insulation Residential Insulation Air Sealing Rigid Foam Board
Details
  • Year established: 1988
Highlights and features
  • 35+ years of regional insulation expertise with five local service centers
  • Certified installers trained in advanced building science techniques
  • Tailored solutions for unique climate challenges in northern states
  • Community-focused leadership with deep local construction industry ties
  • Exclusive Owens Corning partnership for premium material selection
Associations and certifications
  • Owens Corning Certified Energy Expert
What people say
Expert installation Energy savings achieved Professional team Climate-specific solutions Community involvement
Update Listing
Services
Spray Foam Insulation
Spray foam insulation combines air sealing and thermal protection in one application. This expanding foam creates a continuous barrier against air infiltration and moisture intrusion while improving indoor air quality. Ideal for attics, basements, and hard-to-reach spaces, it offers superior R-values and structural reinforcement. Our team uses BASF and Johns Manville products for lasting performance in residential and commercial buildings.
Fiberglass Insulation
Fiberglass insulation provides cost-effective thermal and acoustic control through batt/roll or loose-fill formats. Made from recycled materials, it offers non-combustible, moisture-resistant performance for walls, attics, and floors. Our Owens Corning and Johns Manville products maintain effectiveness over time while reducing energy consumption. Available in formaldehyde-free options for eco-conscious projects.
Air Barrier Installation
Air barrier systems prevent uncontrolled air leakage in commercial buildings through synthetic, breathable membranes. Applied during construction, these fluid or self-adhered barriers protect against wind-driven rain while allowing vapor escape. Enhances energy efficiency by maintaining HVAC system effectiveness and preventing moisture-related damage in new construction projects.
Exterior Waterproofing
Exterior waterproofing systems safeguard building foundations using fluid-applied or self-adhered membranes. Applied to concrete walls and critical junctions, these barriers prevent water intrusion that causes mold, structural damage, and indoor air quality issues. Essential for commercial buildings and residential basements in regions with freeze-thaw cycles and heavy precipitation.
Air Sealing
Air sealing eliminates energy-wasting gaps around windows, doors, and construction penetrations using caulk or spray foam. This critical step prevents conditioned air loss, reduces allergen infiltration, and enhances comfort. Most effective when combined with insulation installation to create comprehensive thermal and air barriers in new and existing structures.
People
Dan Frisch
President
Dan Frisch has led Cullen Insulation since 2017, bringing 25+ years of industry experience. A former account manager turned insulation expert, he prioritizes clear communication and builder relationships. Active in youth hockey coaching and community service through the Cullen Children's Foundation.
Eric Brutger
Vice President
Eric Brutger co-owns Cullen Insulation with 30+ years in the field. Starting as a part-time installer, he earned his MBA while working full-time. Focuses on business growth and technical innovation, balancing family time with outdoor activities. Committed to team development and customer satisfaction.
Questions
What areas do you serve?
We operate from six locations in Fargo and Bismarck, ND; Grand Forks, ND; Sioux Falls, SD; and Bozeman, MT, serving the Upper Midwest region including Nebraska and Minnesota.
What insulation types do you offer?
We provide spray foam, fiberglass, rigid foam board, air barrier systems, and waterproofing solutions for residential, commercial, and multifamily projects.
How do you handle commercial projects?
Our commercial team specializes in large-scale insulation for office buildings, hospitals, universities, and industrial facilities using industry-leading materials and installation techniques.
Are your installers certified?
Yes, we maintain Owens Corning Certified Energy Expert status, ensuring our team meets strict technical and performance standards for insulation installation.
Can you help with energy efficiency upgrades?
We assess existing buildings to identify air leakage points and recommend tailored insulation solutions that reduce energy consumption and improve comfort.
What makes you different from competitors?
Third-generation leadership with deep local roots, exclusive product partnerships, and a community-focused approach that prioritizes long-term relationships over transactional work.