Short Answer
The Department of Energy recommends R-49 to R-60 for attic insulation in South Jersey (DOE Climate Zone 4, with Zone 5 in northern portions of Burlington and Ocean counties). Walls should be R-13 to R-15 and floors R-25 to R-30.
Detailed Explanation
R-value recommendations vary by the part of the home being insulated and the local climate zone. South Jersey falls primarily in DOE Climate Zone 4, with some northern areas bordering Zone 5. For attics, the DOE recommends R-49 to R-60 — the higher end (R-60) is recommended for homes in the colder northern edges of the region and for homeowners who want maximum energy efficiency. For walls, the recommendation is R-13 to R-15 for 2x4 wall cavities. For floors over unconditioned spaces (like crawl spaces), R-25 to R-30 is recommended. The attic is by far the most impactful place to upgrade insulation because heat rises — in winter, your heated air escapes through an under-insulated attic, and in summer, attic temperatures can exceed 140°F, radiating heat down into your living space. Upgrading attic insulation from whatever you currently have to R-49+ delivers the best return on investment of any insulation project.
Why It Matters
Knowing the correct R-value target for your climate zone ensures your insulation investment delivers the energy savings and comfort you expect. Insulating to below-recommended levels means you'll still have high energy bills and uncomfortable rooms.
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