Jacksonville homes and insulation
Half of Jacksonville's homes were built in 1962 or earlier, according to Census estimates, and 69.2% are single-family detached houses. Older framing, uninsulated basement rim joists and attics with a few inches of settled insulation are typical places where spray foam is considered.
Morgan County also has many farm and rural properties, where closed-cell foam is often used in pole barns, machine sheds and workshops to control condensation under metal roofs.
Common projects
- Basement rim joists
- Attic floors and roof decks
- Pole barns and shops
- Bonus rooms over garages
What to ask any installer
- Open-cell or closed-cell foam, and how many inches in each area
- The R-value that thickness gives you, in writing
- What prep, ventilation and re-occupancy time the job needs
- Whether they are a registered Ameren Illinois Program Ally, if you want that discount
How the referral works
Tell us about the job by form or phone. We pass it to one independent installer who serves Jacksonville, and they contact you to set up an estimate. We are a referral service, not a contractor, and the referral is free with no obligation.
Sources
Checked October 2026. We link the public source for every figure on this page.
- U.S. Census Bureau ACS 2020–2024 5-year estimates for Jacksonville, IL (via USAStateStats) — median year built, housing type, owner-occupancy
- City of Jacksonville, Utilities — electric provider
- Ameren Illinois, Single-family homeowner upgrades — Program Ally insulation discounts
- IRS, Energy Efficient Home Improvement Credit — 25C status for 2026
