What dimensions are the horizontal and vertical electrical chases molded into continuous foam panels?

InSoFast continuous foam panels feature horizontal electrical chases spaced every 12 to 24 inches and vertical chases at 16 inches on center, measuring approximately 1-1/2 inches wide by 3/4 inch deep.

In traditional basement and masonry retrofits, running electrical wiring requires framing separate wood or steel stud cavity walls or cutting channels into rigid foam with hot knives. Molded raceways inside expanded polystyrene (EPS) panels let electricians pull standard non-metallic sheathed cable without diminishing continuous insulation performance or requiring separate furring.

If you only do one thing: Map your outlet locations along the 16-inch vertical stud layout so single-gang electrical boxes sit directly adjacent to the molded vertical and horizontal chase intersections.

• Horizontal chase layout: Horizontal wiring raceways run continuously across each 24-by-48-inch panel at 12-inch and 24-inch vertical intervals, creating an aligned grid when panels interlock.
• Vertical chase layout: Vertical raceways run parallel to the embedded polypropylene studs at 16 inches on center, allowing vertical drops from top plates straight down to outlet heights.
• Channel profile dimensions: Each molded chase measures 1-1/2 inches in width and 3/4 inch in depth, designed to seat standard 14/2 and 12/2 non-metallic sheathed cable (NM-B) without compressing the foam.
• Box placement and depth: Standard single-gang adjustable or shallow outlet boxes fasten directly to the embedded studs, requiring a simple rectangular cutout through the 2.0-inch or 2.5-inch panel foam.
• Code clearances: The chase placement behind 1/2-inch drywall provides standard setback protection against fastener penetration under National Electrical Code (NEC) Section 300.4 guidelines when wires sit fully recessed.
• Thermal continuity: Pre-formed raceways eliminate manual hot-knife scoring on site, preserving panel density and the rated R-8.5 to R-10.5 continuous thermal barrier across wall assemblies.

• Watch out for: Running low-voltage communication lines alongside 120-volt AC conductors within the same 1-1/2-inch chase without physical barrier separation or metallic shielding.
• Watch out for: Using electrical junction boxes deeper than the 2.0-inch or 2.5-inch panel thickness that bottom out against concrete substrates or steel container corrugations.
• Watch out for: Failing to stabilize non-metallic NM-B cables with low-expansion foam sealant at chase intersections to prevent wire displacement before installing 1/2-inch drywall.

Measure your planned receptacle heights against the 12-inch and 24-inch horizontal chase lines, then contact InSoFast technical support at (888) 501-7899 for complete wiring integration detail drawings.