Attic Insulation Help

Where does an attic actually lose the most heat?

Six areas decide most of a home's insulation performance, and each one needs a different fix - what covers an open attic floor is not what a recessed light or a rim joist needs.Attic floorThe most common job, and the most DIY-friendly - open, accessible, and where most homes gain the mostExterior wallsClosed cavities usually need pneumatic blowing or spray foam, not a DIY top-upRooflines & raftersWhere spray foam.

How is blown-in insulation actually installed?

The Department of Energy is explicit that skipping the first step is the most common way a new insulation job still underperforms.FirstSeal and prep2Air sealThe EPA recommends sealing attic-floor penetrations before insulating, since loose-fill does not stop air moving through gaps around wiring, pipes and fixtures.Baffles and depth markersRafter baffles keep material off the eaves, and depth rulers mark the target.

What does attic insulation cost?

Most homeowners pay about $1,700 to $2,500 to insulate an attic - roughly $1 to $3 per square foot installed, with a national average near $2,100 (HomeAdvisor, 2026). Blown-in fiberglass sits at the low end; spray foam runs highest, at roughly $2 to $5 per square foot.Removing old insulation first, if it is wet, moldy or compacted, adds about $1 to $2 per square foot on top of that.