Installers attach the plastic to the face of the studs by stapling it every four inches. They cut a small hole through the sheet, insert the hose and fill the cavity with dry cellulose. While the plastic may bulge a bit, it doesn't interfere with drywall installation. Properly installed, blown-in cellulose fills entire wall cavities leaving no voids that promote heat loss. High density applications, such as Dry Pak also reduce heat loss due to air leaks.
Cellulose insulation is made from recycled newspapers.
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