Blown-In Insulation in Cullman, AL

Blown-in insulation is the lower-cost way to add depth to an attic or fill closed walls. Loose cellulose or fiberglass is blown across the attic floor or packed into wall cavities. In many Cullman homes, sealing the attic floor and blowing to depth gets most of the benefit of foam for less money.

Seal before you blow

Loose fill slows heat but does not stop air. Before blowing, we seal the gaps in the attic floor: top plates, pipe and wire holes, recessed lights, fans, chases and the hatch. Skipping this step leaves the biggest leaks in place.

Depth for zone 3

Alabama's code summary lists R-30 for ceilings in zone 3. The Department of Energy suggests R-49 to R-60 for an uninsulated attic, or adding R-38 to R-49 over 3 to 4 inches. We write the target R-value and depth, and leave depth markers so you can check.

Cellulose or fiberglass

Cellulose is recycled paper treated for fire and pests. It is dense and slows air movement somewhat. Fiberglass is lighter and does not absorb water the same way. Fixr lists fiberglass at $1.65 to $2.60 per square foot and cellulose at $1.75 to $3.80. Either works in a dry, vented attic; we recommend one based on your attic and explain why.

Walls: dense-pack

Closed walls in older homes can be filled by drilling small holes and blowing cellulose in at high density. HomeGuide lists dense-pack at $1.60 to $4.20 per square foot. Old wiring and blocking affect the plan, so we check first.

Ventilation

Blown-in attics stay vented. We baffle the eaves so fill does not block the soffit vents. Get a free estimate

Cost

HomeGuide lists blown-in at $1.00 to $2.80 per square foot and a typical attic at $900 to $3,600. Fixr lists $1,750 to $5,500 for about 1,500 square feet of attic. Depth, access and sealing change the final number.