Polyurethane Polyisocyanurate Used primarily on wall framing, under concrete slab floors and on masonry basement walls. To ensure fire safety, these materials must be covered with fire-rated gypsum wallboard. To achieve a high effective R-value seams must be taped. Includes fiberglass and mineral wool, with or without vapor barriers. Used to insulate unfinished attics, undersides of floors and open walls.
Blankets are more difficult to handle than batts because of their size.