How to Attic Insulation Check
Your attic is likely the biggest source of energy loss in your home—heat rises and escapes through insufficient insulation in winter, while hot attic air radiates down through thin insulation in summer. This inspection involves measuring insulation depth in multiple locations, checking for gaps around pipes, ducts, and electrical boxes where air leaks through, and looking for damage from pests, moisture, or settling. Proper attic insulation can reduce your heating and cooling costs by 20-30%, making this one of the best investments in home efficiency. Most homes, especially older ones, are under-insulated.
Cost to Skip This Task
Risk $200 – $2,000 in repairs
Why It Matters
The attic is the biggest source of heat loss/gain in most homes. Proper insulation can reduce heating and cooling costs by 20-30%. Settling, damage, and age reduce insulation effectiveness. Check every 2 years or if energy bills spike. Most US homes need R-38 to R-60 attic insulation (10-20 inches of fiberglass). Insulation settles over time, so even if adequate when installed, it may need topping up. Before winter is the best time to address deficiencies.
Safety First
- Wear long sleeves, pants, and an N95 mask around insulation
- Step only on joists or a sturdy board - never between joists
- Use a flashlight and be careful of nails protruding through the roof deck
What You'll Need
Tools
- Ruler or tape measure$5
- Flashlight0
- N95 mask$5
Step-by-Step Instructions
Before You Start
Access your attic on a moderate day (not summer heat). You will measure insulation depth and look for problem areas.
- 1
Carefully enter the attic using proper footing on joists
- 2
Measure insulation depth in several locations with a ruler
Recommended R-value varies by climate: R-38 (10-14 inches of fiberglass) is minimum for most US locations
- 3
Look for areas with thin or missing insulation
- 4
Check around plumbing vents, electrical boxes, and the attic hatch for gaps
- 5
Look for signs of pest damage (tunnels, droppings, chewed insulation)
- 6
How to Verify Success
Insulation is uniformly 10-14+ inches deep. No gaps around penetrations. No moisture or pest damage. Soffit vents unblocked.
When to Call a Professional
- Insulation depth is less than 8 inches throughout (blown-in insulation $1000-2500 for average attic)
- You want to add blown-in insulation (professional installation ensures proper coverage, $1-2 per sq ft)
- There is asbestos insulation present—vermiculite (asbestos testing $200-400, removal if needed $15-75 per sq ft)
- Significant pest or mold damage (pest remediation $300-1000, mold remediation $500-3000)
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