Clarke County, VA Insulation Payback
Clarke County, VA: what topping up your attic actually costs
Clarke County sits in IECC climate zone 4 (Mixed-Humid) — real heating and real cooling seasons both, roughly balanced across the year. For a currently uninsulated attic, DOE and ENERGY STAR recommend building up to R-60. Topping up a typical 1,000-square-foot attic from bare joists (R-2) to R-60 runs an estimated $3,480, and saves about $1,556 a year in heating and cooling — a payback around 2.2 years. That's about as fast as attic paybacks get.
The breakdown behind the number
The estimated savings split roughly $1,439/year heating, $117/year cooling. Out of every 100 US counties tracked here, Clarke County's savings potential beats roughly 57 of them. Within zone 4 specifically, it ranks 90th of 825 counties by estimated savings. Virginia averages $1,342/year across the counties tracked here; Clarke County comes in 16% higher.
Clarke County's actual weather, not a national average
NOAA's MT WX 3, VA US station, 6.2 miles from Clarke County, supplies the 5,380 HDD and 730 CDD this estimate runs on. By total degree days, Clarke County sits at the 54th percentile nationally. Clarke County falls in DOE's moisture regime A (humid), a detail that affects vapor-barrier recommendations more than the R-value target itself.
Already have some insulation?
Already have a few inches up there? Topping R-11 up to R-49 runs about $2,280 for about $227/year saved — roughly 10 years to break even. This one is a genuine toss-up, not a clear yes.
Next steps for a Clarke County attic
Get more than one quote before committing. Attic access and any needed air sealing move the price around, and most contractors won't take a job below roughly $600 regardless of size - worth asking upfront given Clarke County's estimated $1,556/year on the line.
Nothing here is a guess
Every figure on this page traces to DOE/IECC climate zones and NOAA degree-day normals, documented in the methodology guide. The guide to what R-value actually means explains why R-60 is the target here specifically.