Blown In & Attic Insulation

Choosing between blown-in fiberglass on the attic floor and open-cell spray foam on the roof decking depends on your goals, budget, and climate. Here’s a breakdown of the benefits of each:

Blown-in Fiberglass on Attic Floor

✅ Lower Cost – Typically much cheaper than spray foam.
✅ Easier Installation – Can be added over existing insulation and doesn’t require as much prep work.
✅ No Ventilation Changes Needed – Works with traditional vented attic systems.
✅ Good R-Value for Price – Can achieve high R-values affordably (R-30 to R-60).
✅ DIY-Friendly – Many homeowners can install it themselves.

Open-Cell Spray Foam on Roof Decking

✅ Air Sealing & Insulation in One – Creates an air-tight seal, preventing air leakage.
✅ No Attic Ventilation Needed – Seals the attic and prevents outside air from entering.
✅ Improves HVAC Efficiency – Keeps attic temperature closer to indoor conditions, reducing HVAC strain.
✅ Moisture Control – Reduces the risk of condensation and mold.
✅ Great for Homes with HVAC in the Attic – Helps conditioned air ducts operate more efficiently.

Which One Should You Choose?

• If you want the most budget-friendly option: Go with blown-in fiberglass.

• If you have HVAC in the attic & want max efficiency: Go with spray foam on roof decking.

• If you live in a hot or humid climate: Spray foam helps keep the attic cooler and reduces humidity issues.

• If you don’t plan to finish or condition the attic: Blown-in fiberglass is usually sufficient.

Let me know if you need a recommendation for your specific situation!