Which bracket can I use to extend stub bays?

For extending shallow stud or stub framing bays to achieve deeper continuous insulation depths, select InSoFast X-Brackets for spray foam and blown-in assemblies or InSoFast Batt-Brackets for friction-fit batt insulation.

Builders and remodelers across the United States and Canada frequently encounter shallow 2x4 framing that cannot meet modern energy code requirements, such as 2021 IECC continuous exterior R-values. Extending these framing cavities outward or inward allows crews to significantly increase thermal performance without the expense of framing complete secondary walls.

If you only do one thing: Base your bracket choice strictly on your insulation material—choose the X-Bracket for spray foam or dense-pack blown fills and the Batt-Bracket for friction-fit mineral wool, fiberglass, or wood fiber.

• X-Bracket profile sizes: The X-Bracket is available in 2.5-inch, 3.75-inch, 5.5-inch, 7.5-inch, and 9.5-inch depths to extend bays, with published pricing starting at $85.35 per box ($0.63 per square foot).
• Batt-Bracket profile sizes: The Batt-Bracket is available in 3.5-inch, 5.5-inch, and 7.25-inch depths to support batt assemblies, starting at $122.21 per box ($0.89 per square foot).
• Thermal performance range: Depending on selected depth, X-Bracket assemblies deliver between R-9.75 and R-60 across blown insulation and closed-cell spray foam, while Batt-Brackets deliver R-13 to R-32 using high-density batts.
• Stud spacing coverage: One box of either bracket system covers roughly 77 to 97 square feet when spaced at 16 inches on center (O.C.) or 116 to 136 square feet at 24 inches O.C.
• Thermal bridge elimination: Both non-metallic bracket designs offset structural members from exterior cladding or interior finishes, preventing conductive heat loss through the framing studs.

• Watch out for: Using standard 15.25-inch wood-stud batts in Batt-Bracket assemblies instead of required steel-stud-width batts (16.25 inches or 24.25 inches wide), which leads to gaps and friction-fit failure.
• Watch out for: Selecting bracket depths without verifying the required structural fastener penetration into the existing framing to support the final exterior cladding or interior drywall load.

Calculate the required cavity depth for your target R-value, then call InSoFast phone support at (888) 501-7899 or order online sample packs to confirm bracket alignment with your framing.

General information only, not medical advice. Decisions about health, treatment or wellbeing should be made with a doctor or other qualified healthcare professional.