Skamania County, WA Insulation Payback
Skamania County, WA: what topping up your attic actually costs
Skamania County, Washington is zone 5 under DOE's climate map (Cold), which means winters that dominate the energy bill, with cooling a minor factor. An uninsulated attic there should be built up to R-60. For an attic around 1,000 square feet, closing the gap from R-2 to R-60 costs around $3,480 and saves an estimated $1,715 a year — payback in roughly 2 years. That's about as fast as attic paybacks get.
Heating vs. cooling in Skamania County
The estimated savings split roughly $1,682/year heating, $33/year cooling. Out of every 100 US counties tracked here, Skamania County's savings potential beats roughly 67 of them. Within zone 5 specifically, it ranks 457th of 745 counties by estimated savings. Washington averages $1,583/year across the counties tracked here; Skamania County comes in 8% higher.
Where these numbers come from
NOAA's CARSON FISH HATCHERY, WA US station, 10.9 miles from Skamania County, supplies the 6,291 HDD and 207 CDD this estimate runs on. That combined heating-and-cooling load ranks Skamania County 1217th nationally by total degree days — the 62th percentile. Skamania County falls in DOE's moisture regime B (dry), a detail that affects vapor-barrier recommendations more than the R-value target itself.
If the attic isn't bare
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 $250/year saved (~9.1-year payback). This one is a genuine toss-up, not a clear yes.
Getting it done in Skamania County
Actual quotes will vary by attic access, existing debris, and whether the job needs air sealing first. Treat the $3,480 figure above as a planning number for Skamania County, not a bid - contractors typically charge a $600 minimum regardless of job size.
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.