Best Insulation for Interior Walls Stick-Stack-Done

Most installations can be completed with a utility knife and caulk gun

If you are looking for the best, most cost-effective insulation for your interior walls that is suitable for both DIY residential projects and large-scale commercial projects, consider EPS foam insulation panels from InSoFast!

The InSoFast UX 2.0 Panel is 2-inches thick with a flat surface that exposes the face of the embedded studs. The EPS body is manufactured with a fire-retardant additive and serves as a Class III vapor barrier.

With R-8.5 continuous insulation, rot-resistant framing, drainage channels, electrical raceways, and a simple, stackable interlocking design, this panel is a very cost-effective insulation solution for interior applications.

With tightly interlocking tongue-and-groove edges that don’t need taping, the installation of InSoFast Panels could not be easier and requires only a minimum of tools and supplies, including a utility knife and saw (hand, jig, skill or table).

Built in embedded stud framing aligns every 16-inches on center to simplify gluing or screwing panels to walls, and electrical raceways run horizontally and vertically along the edge of every panel.

When you need a thicker panel with a higher R-value, choose the InSoFast EXi 2.5 Panel, at 2 ½-inches thick. Tighter interlocks and recessed studs keep the EX barrier truer and straighter, enabling it to bridge over cups, bows and other irregularities in concrete basement walls. This panel’s continuous R-value of 10 outperforms traditionally framed R-15 batt walls and provides 20% more insulation than our UX panels.

Best Insulation for Interior Walls

Fiberglass/Wood Framing or InSoFast Panels?

Here are just a few advantages of choosing InSoFast continuous insulation panels instead of fiberglass insulation:

Thermal bridging: A thermal bridge occurs when a penetration of the insulating layer takes place along your walls, allowing heat and cold to pass through undisturbed. With traditional fiberglass and wood framing, each wood stud represents a thermal short circuit where moisture-filled, heat-transferring air can pass through the barrier. The stud area accounts for 15% to 25% of the wall surface and significantly reduces the R-value of the fiberglass.

InSoFast panels qualify as continuous insulation (CI) because the integrated, non-conductive polypropylene studs are encapsulated by the insulating material, eliminating the potential for thermal bridging to occur. The interlocking grooves also create a tight seal at the intersection of each panel.

Moisture and R-value: Trapped moisture is a serious problem for all homes. Mold can grow on moist fiberglass, and moisture can lead to rot and decay of the wood-framing between it. Fiberglass loses as much as 80% of its R-value when exposed to even low moisture levels (especially common in below-grade applications).

InSoFast panels maintain a constant R-value when exposed to moisture and will shed liquid water due to the engineered moisture control channels built into the panel.

Ease of installation: Installing traditional fiberglass insulation is complicated and is not a DIY kind of job. In order for fiberglass insulation to work effectively, it must be in continuous contact with its surrounding surfaces on all six sides. The smallest gap allows air circulation that kills the insulation value.

The tongue-and-groove connections within InSoFast panels allow them to be installed with no gaps, and alignment notches make installation virtually foolproof. Most installations can be completed with a utility knife and caulk gun. 

InSoFast patented EPS insulation panels are the best installation for interior walls. They are manufactured in Idaho, Massachusetts and Minnesota and shipped free of charge to project sites across the country and can be special ordered at many Menards home improvement stores in the Midwest. Call us today at (888) 501-7899 or contact us online to learn more.


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