Assess Current Insulation
1-2 hoursMeasure existing insulation depth, identify type (fiberglass, cellulose, foam), and check for gaps, compression, and ventilation.
Field context
This workflow is part of 7 niche fields
Free step-by-step attic insulation for homeowners reducing energy bills. Plan attic insulation with calculators and checklists covering assess current.
Measure existing insulation depth, identify type (fiberglass, cellulose, foam), and check for gaps, compression, and ventilation.
Determine target R-value for your climate zone, calculate bags/batts needed, and choose blown-in vs batts vs foam board.
Seal air leaks around pipes, chimneys, and light fixtures with caulk/foam before adding insulation. Install baffles at eaves.
Install to target depth evenly, maintain ventilation baffles, keep insulation away from recessed lights unless IC-rated, and dam around access hatch.
Estimate energy savings from improved insulation.
Calculate attic floor square footage for material estimate.
Budget $500-$1,500 for DIY attic insulation project.
Model HVAC load reduction from improved R-value.
US DOE recommended attic insulation levels.
| Climate Zone | Recommended R-Value | Fiberglass Depth | Cellulose Depth |
|---|---|---|---|
| 1-2 (South) | R-30 to R-49 | 10-16 inches | 8-13 inches |
| 3-4 (Mid) | R-38 to R-60 | 12-19 inches | 10-16 inches |
| 5-7 (North) | R-49 to R-60 | 16-19 inches | 13-16 inches |
| 8 (Extreme) | R-49 to R-60+ | 16-19+ inches | 13-16+ inches |
Adding insulation over air leaks is like wearing a coat with holes — seal penetrations first for 20-30% better performance.
Attic insulation pays back in 2-5 years through energy savings — among the highest ROI home improvements.
Blocking soffit vents with insulation causes attic moisture, mold, and roof rot — baffles are mandatory.