Does the 2.5-inch X-Bracket achieve up to R-17.5 when insulated with closed-cell spray foam?

Yes, the InSoFast 2.5-inch X-Bracket achieves a thermal performance rating of R-10 to R-17.5 when combined with closed-cell spray polyurethane foam applied across the full depth of the bracket assembly.

Traditional framing creates continuous thermal bridging through wood or steel studs, reducing effective wall insulation values by up to 30 percent in standard building envelopes. Using non-conductive brackets eliminates framing cavities while allowing a continuous air and vapor barrier to bond directly against masonry, concrete, or framed assemblies.

If you only do one thing: Verify the spray contractor installs closed-cell foam rated at R-6 to R-7 per inch across the full 2.5-inch bracket depth to reach R-17.5 without framing-induced thermal loss.

• Thermal performance: The 2.5-inch bracket profile delivers R-10 to R-17.5 with closed-cell spray foam (at R-6 to R-7 per inch) or R-9.75 when packed with dense-blown insulation.
• Thermal bridge isolation: Non-conductive bracket engineering reduces heat transfer by a factor of 250 compared to standard steel fasteners, protecting interior drywall attachments from cold spots.
• Assembly coverage and cost: A single box starting at $85.35 covers 77 to 97 square feet at 16-inch on-center spacing ($0.63 per square foot) or 116 to 136 square feet at 24-inch on-center spacing.
• Air and moisture control: Closed-cell foam sprayed around the bracket locks directly to the substrate, forming an air barrier, vapor retarder, and radon soil-gas seal across 100 percent of the wall cavity in a single application.
• Multi-substrate versatility: The 2.5-inch depth mounts securely to interior basement concrete, exterior framing, masonry, and steel shipping container walls tested to resist lateral loads exceeding 300 pounds per square foot.

• Watch out for: Off-ratio chemical mixing or improper pass thicknesses, which cause irregular curing, voids, and thermal drops below the R-10 minimum.
• Watch out for: Substituting open-cell foam in place of closed-cell foam, which allows vapor diffusion and yields only R-3.5 to R-3.8 per inch rather than R-17.5.
• Watch out for: Over-spraying beyond the 2.5-inch bracket face, which requires mechanical trimming before installing 1/2-inch or 5/8-inch gypsum drywall panels.

Calculate your net wall square footage and select 16-inch or 24-inch on-center bracket spacing based on your interior cladding weight before ordering.