In Dallas-Fort Worth, the average cost for a blown-in fiberglass "top-off" ranges from $1.00 to $2.00 per square foot. For a premium, full insulation removal followed by Open-Cell Spray Foam application, costs typically range from $3.50 to $6.00+ per square foot, depending on the complexity of the roof deck and the severity of the old insulation degradation. A standard 2,500 sq ft home can expect to pay anywhere from $3,000 for basic upgrades to over $8,500 for a clinical thermal envelope replacement.
| Service Tier | Method | Cost Per Sq Ft | Best For |
|---|---|---|---|
| Basic Upgrade | Blown-In Over Old (Top-Off) | $1.00 - $2.00 | Clean attics needing more R-value |
| Premium Upgrade | Extraction + Spray Foam | $3.50+ | Extreme heat, rat damage, high bills |
| Mid-Tier | Radiant Barrier + Cellulose | $2.50 - $4.00 | Sun-facing roofs, 2-story homes |
Most contractors hide their pricing until they are sitting at your kitchen table trying to close a high-pressure sale. We operate differently. Here is the strict engineering reality of what it costs to correctly fully seal an attic in the DFW metroplex. Our DFW Property Data Report shows that 58.7% of homes in the metroplex were built before 2000 — most need this work. Want exact numbers for your specific square footage? Use our interactive DFW Insulation Calculator to instantly map your costs and ROI.
What is the Difference Between an Insulation Top-Off and a Full Insulation Removal?
The biggest difference in an estimate comes down to whether you are just "topping off" over existing material, or if you need a "Full Insulation Removal." If your old insulation is compacted, damaged by roof leaks, or infested with rat droppings, simply blowing new material over it will trap those odors and moisture directly against your drywall.
Blown-In Over Old
$1.00 - $2.00 per sq. ft.
We add a 10-12 inch layer of premium fiberglass directly over your existing material to achieve a combined R-38 thermal resistance.
*Best if old insulation is clean and dry.Full Extraction + Spray Foam
$3.50+ per sq. ft.
We vacuum out 100% of the old material to the bare drywall. Then we apply expanding Open-Cell foam against the roof deck to completely air-seal the attic.
*Best for severe heat, high bills, and pest damage.