New York State Building R-value Code Insulation Requirements. on exterior walls, from R-13 to R-25, plus Attic insulation R-49 to R-60. Existing Attic R-38.
As you’re getting ready to insulate your home, one of your first questions will most likely be, “How much insulation do I need?” The amount of insulation your home needs primarily depends on two factors:
- The region you live in
- The area of your home that needs to be insulated
Notes
• About R-value: R-value is a measurement of a material’s ability to resist heat flow. The higher the
R-value, the greater the insulating power. Installers should consult data sheets provided by polyiso
manufacturers for information on product-specific R-values.
• Code Compliance: The International Energy Conservation Code recognizes ASHRAE 90.1 as an
alternate compliance option for both new construction and existing buildings.
How Much Insulation Do I Need | Home Insulation | New York NY
Zone | Add Insulation to Attic | Floor | |
Uninsulated Attic | Existing 3–4 Inches of Insulation | ||
| 1 | R30 to R49 | R25 to R30 | R13 |
| 2 | R30 to R60 | R25 to R38 | R13 to R19 |
| 3 | R30 to R60 | R25 to R38 | R19 to R25 |
| 4 | R38 to R60 | R38 | R25 to R30 |
| 5 to 8 | R49 to R60 | R38 to R49 | R25 to R30 |
Insulation Component R- Value-Based Method
Building thermal envelope opaque assemblies shall comply with the requirements of Sections C402.2 and C402.4 based on the climate zone specified in Chapter 3. For opaque portions of the building thermal envelope intended to comply on an insulation component R-value basis, the R-values for insulation shall be not less than that specified in Table C402.1.3. Commercial buildings or portions of commercial buildings enclosing Group R occupancies shall use the R-values from the “Group R” column of Table C402.1.3. Commercial buildings or portions of commercial buildings enclosing occupancies other than Group R shall use the R-values from the “All other” column of Table C402.1.3.
STEEL-FRAME CEILING, WALL AND FLOOR INSULATION R-VALUES
| WOOD FRAMER-VALUEREQUIREMENT | COLD-FORMED STEEL-FRAMEEQUIVALENT R-VALUEa |
| Steel Truss Ceilingsb | |
| R-30 | R-38 or R-30 + 3 or R-26 + 5 |
| R-38 | R-49 or R-38 + 3 |
| R-49 | R-38 + 5 |
| Steel Joist Ceilingsb | |
| R-30 | R-38 in 2 × 4 or 2 × 6 or 2 × 8 R-49in any framing |
| R-38 | R-49 in 2 × 4 or 2 × 6 or 2 × 8 or 2 × 10 |
| Steel-Framed Wall, 16 inches on center | |
| R-13 | R-13 + 4.2 or R-21 + 2.8 or R-0 + 9.3 or R-15 + 3.8 or R-21 + 3.1 |
| R-13 + 3 | R-0 + 11.2 or R-13 + 6.1 or R-15 + 5.7 orR-19 + 5.0 or R-21 + 4.7 |
| R-20 | R-0 + 14.0 or R-13 + 8.9 or R-15 + 8.5 or R-19 + 7.8 or R-19 + 6.2 or R-21 + 7.5 |
| R-20 + 5 | R-13 + 12.7 or R-15 + 12.3 or R-19 + 11.6 or R-21 + 11.3 or R-25 + 10.9 |
| R-21 | R-0 + 14.6 or R-13 + 9.5 or R-15 + 9.1 orR-19 + 8.4 or R-21 + 8.1 or R-25 + 7.7 |
| Steel Framed Wall, 24 inches on center | |
| R-13 | R-0 + 9.3 or R-13 + 3.0 or R-15 + 2.4 |
| R-13 + 3 | R-0 + 11.2 or R-13 + 4.9 or R-15 + 4.3 orR-19 + 3.5 or R-21 + 3.1 |
| R-20 | R-0 + 14.0 or R-13 + 7.7 or R-15 + 7.1 orR-19 + 6.3 or R-21 + 5.9 |
| R-20 + 5 | R-13 + 11.5 or R-15 + 10.9 or R-19 + 10.1 orR-21 + 9.7 or R-25 + 9.1 |
| R-21 | R-0 + 14.6 or R-13 + 8.3 or R-15 + 7.7 orR-19 + 6.9 or R-21 + 6.5 or R-25 + 5.9 |
| Steel Joist Floor | |
| R-13 | R-19 in 2 × 6, or R-19 + 6 in 2 × 8 or 2 × 10 |
| R-19 | R-19 + 6 in 2 × 6, or R-19 + 12 in 2 × 8 or 2 × 10 |
a.The first value is cavity insulation R-value, the second value is continuous insulation R-value. Therefore, for example, “R-30+3” means R-30 cavity insulation plus R-3 continuous insulation.
b.Insulation exceeding the height of the framing shall cover the framing.
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