Rigid insulation boards are made of insulation materials pressed into foam boards. Higher-density polyiso include boards can be a subcategory of rigid insulation boards and are made of compressed polyisocyanurate coated by fiberglass sheets. Specialist installation is important for complicated roof configurations steep pitches or when dealing with spray foam https://paxton0nxfn.ampedpages.com/the-single-best-strategy-to-use-for-how-to-isolate-roofs-59117403