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Insulation in Bonners Ferry, Idaho

The short answer

As of October 2026, 4 local businesses do insulation work in Boundary County. Boundary County is in climate zone 6, where ENERGY STAR suggests R60 insulation for an empty attic, so ask any bid what R-value you'll end up with.

By the Huck's Guide team. Updated October 28, 2026

At a glance

Attic level for zone 6
R49 to R60ENERGY STAR

Based in Boundary County

Serves Boundary County from nearby

Insulation around here

Weather records for the Bonners Ferry station, kept from 1907 to 2016, show average lows below freezing from November through March, and January's average high is just 32 degrees.

Source: Western Regional Climate Center, Bonners Ferry monthly climate summary. Average temperatures checked on the station's long-term monthly summary, Oct 28, 2026.

The energy code's county table lists Boundary County in climate zone 6B. ENERGY STAR's insulation table groups zone 6 with zones 5 and 4C.

Source: International Code Council, 2012 IECC climate zones by county (sample pages). Climate zone checked in the ICC's 2012 county table, Oct 28, 2026.

R-value is how well insulation slows heat, and higher is better. Different kinds reach the same R-value at different depths, so ask for the R-value you'll end up with, not just the inches.

Spray foam, blown-in or batts

  • Blown-in cellulose or fiberglass is blown across an attic floor. It fills in around joists, wires and odd corners.
  • Batts and rolls fit between the studs and joists in open walls, floors and some attics.
  • Spray foam seals gaps as it insulates. Consumer Reports says closed-cell spray foam "almost always requires professional installation."

Some insulation contractors do all three, and some do only spray foam. Tell them which part of the house you want done.

Ask before you hire

Two bids can look alike and leave you with very different attics. Ask each one:

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