Attic insulation leads from the homes most likely to be far below R-49.

Playbook

How to find homes with under-insulated attics

Public records don't tell you how much insulation is in an attic, but they do offer strong proxies. Year built is the most useful. Energy codes were far looser before the 1980s, and many homes built before then started with little. Tenure is the next filter, since owners who have lived in a home for 10 or 20 years are less likely to have topped up, and more likely to have the budget and interest to do it now.

Use the climate zone. The Department of Energy recommends roughly R-30 to R-49 in an uninsulated attic in the warmest parts of the country and R-49 to R-60 in the coldest. Stating the target for your own region makes the card specific and credible. Converting R-value to inches helps too, because 'about 16 inches' is something an owner can picture and check, while 'R-49' isn't. Depth per R-value varies by material, so match the figure to what you install.

Give owners a self-test. ENERGY STAR's simple guidance is that if attic insulation is level with or below the floor joists, you probably need more. Putting that test on a card is honest, useful, and memorable, and it turns a passive reader into someone who might climb up with a flashlight. If they do, they will want a professional to confirm what they saw.

Sell air sealing as part of the job. ENERGY STAR advises sealing air leaks before adding insulation, because insulation works best when air isn't moving through it. Common leaks include the attic hatch, plumbing stacks, top plates, and recessed lights. Older recessed fixtures that aren't rated for insulation contact need special care, and you should check them during the measurement. A quote that includes sealing is more valuable, and harder to compare directly with a cheaper blow-only bid.

Screen for hazards at the visit. Knob-and-tube wiring and vermiculite are two reasons to stop and talk to the owner before doing anything else. EPA advises against disturbing vermiculite, which may contain asbestos, until it has been tested. Bathroom fans that vent into the attic are another common finding and should be routed outside before you insulate over them. These details show expertise and protect you on the job.

Comply with the rules on paperwork. The FTC's R-Value Rule requires installers to give customers a contract or receipt showing the coverage, thickness, and R-value of what was installed. Treat that as a selling point: a written before-and-after with photos is exactly what a buyer's inspector would want to see someday, and it is what your neighbors' cards can point to.