Quick Answer
The direct answer's estimate for an attic job ($1,500-$3,000) is slightly low for current market conditions. It should be updated to reflect the higher range. Otherwise, it's accurate and helpful.
Common Symptoms
Possible Causes
Step-by-Step Diagnosis
Step 1
Do your own homework first. Look up the recommended R-value for your area and learn the basic differences between fiberglass, cellulose, and spray foam.
Step 2
Hunt for contractors by asking for referrals from neighbors, friends, and trusted tradesmen (roofers, HVAC techs). Look for BPI certifications.
Step 3
Conduct a phone 'interview' with at least 5 companies. Ask about insurance (and for proof from their agent), if they use employees vs. subs, and their approach to air sealing and ventilation.
Step 4
Schedule on-site assessments with the 3-5 contractors who pass the phone screen. Watch to see if they get into the attic and do a thorough inspection.
Step 5
Review the written proposals in detail. Compare the specified R-value, material type, and scope of work for air sealing—not just the final price.
Step 6
Before signing anything, call the references provided by your top choice to verify the quality of their work and professionalism.
DIY vs Professional Costs
| Repair Type | DIY Cost | Professional Cost | Time Required |
|---|---|---|---|
Vet a Contractor (Research, Calls, Quotes) | $0 | N/A | 4-8 hours |
Attic Insulation Upgrade (Blown-in) | Not Recommended | $1,800 - $4,500 | 1 day |
Wall Insulation (Existing Home) | Not Recommended | $2,500 - $7,500 | 1-2 days |
Spray Foam Insulation (Attic or Walls) | Not Recommended | $4,000 - $15,000+ | 2-3 days |
When to Call a Professional Insulation
- Always. For any significant insulation project beyond a tiny patch job, you should hire a professional.
- When you're unsure which insulation type (fiberglass, cellulose, spray foam) is right for your home's specific design and your climate.
- To make sure the job is done to code and you achieve the correct target R-value for your region.
- To ensure that critical air sealing and ventilation work is done correctly to avoid creating moisture problems or negating the insulation's effectiveness.
Prevention Tips
- Get EVERYTHING in writing. The scope of work, materials used, final R-value, and warranty information must be in the contract.
- Never choose a contractor based on price alone. The cheapest quote often indicates cut corners, like skipping the critical air sealing step.
- Make sure the contract is specific. It should detail not just 'insulation,' but the brand, type, and final installed depth/R-value.
- Don't sign a contract that doesn't include a detailed line item for air sealing the attic floor.
- Before work starts, confirm they have a plan for protecting your home's interior and for complete cleanup afterward.
Frequently Asked Questions
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