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Dense Pack Fiberglass Wall System
Dense-pack fiberglass insulation consists of fiberglass blown under pressure into an enclosed space. During new construction, this can be done once you have completed the rough wiring and plumbing, and before or after adding drywall. Dense-pack fiberglass insulation is also considered ideal for retrofitting older homes or commercial buildings.
When packed evenly, dense-pack fiberglass insulation can effectively seal the entire cavity. Dense-packed fiberglass insulation provides exceptional thermal resistance and soundproofing and greatly reduces airflow in and out of the cavity.
Key Benefits of Dense-Pack Fiberglass Insulation
Dense-pack fiberglass insulation delivers superior air sealing, thermal performance, soundproofing, and moisture resistance for both new construction and retrofit projects.
Superior Air Sealing
Because the fiberglass is packed tightly under pressure, it completely fills gaps and voids, slowing drafts and reducing uncontrolled airflow through wall cavities.
Thermal Performance & Energy Savings
Dense-packed fiberglass increases the R-value per inch compared to loose-fill, helping homes and buildings retain heat better and lower year-round monthly energy costs.
Soundproofing
The dense fill reduces sound transmission between rooms and from outside, making dense-pack fiberglass insulation a practical choice for noise-sensitive spaces and shared walls.
Moisture & Mold Resistance
Fiberglass fibers don’t absorb water or feed mold growth, helping dense-pack walls stay healthier than organic insulation materials in damp conditions.
Frequently Asked Questions
What is the R-value of dense-pack fiberglass insulation?
Dense-pack fiberglass insulation typically delivers an R-value of about 3.6 to 4.2 per inch, depending on the installed density, providing strong thermal performance in most wall cavities.
How is dense-pack fiberglass different from regular blown-in or loose-fill fiberglass?
Dense-pack is installed at a much higher density under pressure, which seals cavities tightly and resists settling, unlike loose fill that can shift over time.
Can dense-pack fiberglass be installed in existing, finished walls?
Yes. Small holes are drilled into the wall cavity, fiberglass is blown in under pressure, and the holes are patched, making it ideal for retrofitting older homes.
Is dense-pack fiberglass a good fit for Wisconsin's cold winters?
Yes. Dense-pack fiberglass insulation in Wisconsin benefits from its tight seal and strong thermal resistance, helping homes and buildings retain heat, cut energy bills, and stay comfortable during harsh winter months.
How long does a typical dense-pack fiberglass installation take?
Most residential installations take one to two days, depending on the size of the home and the number of cavities being filled, with minimal disruption to occupants.