Quick Answer
The direct answer is quite good. Perhaps add a brief mention that proper ventilation is also crucial, especially when adding insulation, to prevent moisture issues.
Common Symptoms
Possible Causes
Step-by-Step Diagnosis
Step 1
Get a good flashlight and mask, and visually inspect the attic for wet spots, mold, or signs of pests like droppings or tunnels.
Step 2
Use a ruler to measure the current depth of the insulation in several places to get an average.
Step 3
Estimate your current R-value (e.g., old fiberglass is ~R-2.5/inch; old cellulose is ~R-3.5/inch). If you can see your joists, you don't have enough.
Step 4
Identify and seal air leaks around pipes, electrical fixtures, can lights, and the attic hatch using spray foam and caulk.
Step 5
Check that soffit vents are not blocked and install baffles if necessary to ensure proper airflow from eaves to ridge.
Step 6
If you have older, pebble-like insulation (vermiculite), stop and get it tested for asbestos before proceeding.
DIY vs Professional Costs
| Repair Type | DIY Cost | Professional Cost | Time Required |
|---|---|---|---|
Air Sealing Gaps & Cracks | $50 - $100 | $300 - $800+ | 2-4 hours |
Blowing In Loose-Fill (Top-Up) | $600 - $1,200 | $1,500 - $3,000 | 4-6 hours |
Adding Fiberglass Batts (Top-Up) | $700 - $1,500 | $1,800 - $3,500 | 6-8 hours |
Full Removal & Replacement | $1,500 - $3,000+ | $3,000 - $7,000+ | 1-2 days |
When to Call a Professional Insulation
- When you find any evidence of moisture, mold, or significant pest contamination in the existing insulation.
- If your home has older, pebble-like vermiculite insulation that may contain asbestos. Do not touch it.
- For complex air sealing jobs with numerous recessed lights, ductwork, or a blower door test is desired.
- If the attic or crawl space has very limited access, making the work unsafe or difficult to perform correctly.
Prevention Tips
- Ensure your attic is properly ventilated from soffit to ridge to prevent moisture buildup.
- Promptly repair any roof leaks or plumbing issues to keep insulation dry.
- Seal all potential pest entry points around the foundation and where utilities enter the house.
- Avoid storing items directly on top of insulation; if you must, build a raised platform.
Frequently Asked Questions
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