EPS Fanfold Underslab Insulation (4×24 Panels)
EPS fanfold insulation is a compact 4×24 panel system that unfolds to cover 96 square feet per bundle. It is commonly used under concrete slabs to provide continuous insulation while reducing handling time on site.
Fanfold EPS is available in multiple compressive strengths depending on slab loading requirements.
Why Choose EPS Fanfold Insulation?
EPS fanfold panels are designed to reduce labor, handling, and installation time compared to standard 4×8 sheets.
• 3× the coverage per bundle
A single fanfold bundle covers 96 square feet, compared to 32 square feet for a standard 4×8 sheet—meaning fewer pieces to move and faster layout.
• Integrated vapor barrier
Each fanfold panel includes an attached 6-mil vapor barrier, eliminating the need to install a separate poly layer under the slab.
• Faster installs, fewer steps
With insulation and vapor protection combined into one product, crews save time, reduce material handling, and avoid misalignment issues during pours.
Not sure which PSI you need?
Residential slabs typically use 15 PSI. If you are using rebar, 15 psi can handle up to 31,200 lbs of standard vehicle weight