Green Peaks offers a fully customized fit for your attic stair opening. We use a polyisocyanurate rigid board insulation to seal off the attic space from your home. The Attic Stair Insulator is foil taped around all edges for a perfect seal, as well as using fireblock foam to seal around interior edges for extra protection of leaks. We use foam weatherstripping along the underside of the insulator to allow it to sit and seal properly!! We go above and beyond any product available. It is a custom fit for YOUR home.