Bristol County, RI Insulation Payback
Attic insulation payback for Bristol County, RI
DOE classifies Bristol County as climate zone 5, cold — a real winter that drives most of the annual energy bill here. Its recommended attic R-value for bare joists is R-60. Going from R-2 to the recommended R-60 costs roughly $3,480 installed for a typical attic (about 1,000 sq ft), and pays for itself in about 2.2 years at an estimated $1,550/year saved. Hard to find a home improvement with a faster payback than this.
Where the savings come from
Of that, about $1,409/year comes from reduced heating and $141/year from reduced cooling load through the ceiling. Bristol County beats 56% of the counties in this 3,162-county dataset on estimated insulation savings. Among the 745 counties DOE places in zone 5, Bristol County ranks 694th. Against Rhode Island's own average of $1,664/year, Bristol County runs 7% below that.
Where these numbers come from
The heating and cooling degree days behind this estimate — 5,268 HDD and 880 CDD (base 65°F, 1991-2020 normals) — come from TIVERTON, RI US, the nearest NOAA station with published normals, 6.8 miles from Bristol County's center. That combined heating-and-cooling load ranks Bristol County 1430th nationally by total degree days — the 55th percentile. DOE also classifies Bristol County as moisture regime A (humid) - ask a local contractor whether that changes the vapor-barrier approach for this job.
The smaller top-up scenario
A shallower starting point changes the math: with R-11 already down, only the gap to R-49 needs filling, at roughly $2,280 for an estimated $226/year saved (~10.1-year payback). It is close - the payback only just fits a reasonable timeframe.
Quotes and materials for this job
Real bids depend on how easy the attic is to reach and whether old insulation needs removing first, so treat $3,480 as a starting estimate for a Bristol County job, not a quote. Expect at least a $600 minimum charge from most contractors.
More on how this was built
Nothing here is a guess: the methodology guide names the DOE climate map and NOAA station data behind every number on this page. See the DIY vs. contractor guide for whether a job this size is realistic to do yourself.