How often should you insulate your attic?
Short answer. Attic insulation does not need to be replaced on a schedule; you add or replace it when it falls below recommended levels or gets damaged. ENERGY STAR's retrofit table for climate zone 3, which covers most of Georgia, recommends about R-49 for an uninsulated attic and adding about R-38 where 3 to 4 inches already exist.
When to check
- When you buy a home, and every few years after that.
- After a roof leak, which can soak and flatten insulation.
- After pests: rodents tunnel and soil insulation.
- After HVAC, electrical or cable work, when people crawl through and leave trampled paths.
- When upstairs rooms get noticeably harder to cool.
When to top up or replace
- Top up: insulation is dry and clean but below recommended depth, often the case in homes built before the 1990s.
- Replace: insulation is wet, moldy, contaminated by rodents, or badly compressed.
- Leave alone: loose, gray brown, pebble like vermiculite, which can contain asbestos. Get professional advice before any work disturbs it.
What to do before adding insulation
- Fix roof leaks. New insulation over a leak hides it.
- Air seal the ceiling: top plates, wiring and plumbing holes, chases and the attic hatch.
- Install baffles at the eaves so new insulation does not bury the soffit vents.
- Mark the hatch area and keep a path to the air handler.
North Georgia note
The colder mountain counties fall in climate zone 4, where recommended levels are higher. ENERGY STAR's table by zip code is the easy way to check. See roof ventilation basics and attic heat and shingles.