Insulated plasterboard makes installing thermal insulation easy while saving time and money. Comprised of a polystyrene foam core sandwiched between separate plasterboard layers, it delivers an R-3.2 rating for walls and ceilings. Multi-foil insulation is a sturdy insulation solution, particularly for roofs and exterior walls. These rigid panels have a multi-layered aluminium foil facing to deflect heat. This allows high insulation up to R-6.5 even with thin boards. Insulation rolls are constructed from recycled cotton scraps and other plant fibres. These R-13 batts use trapped air to reduce heat flow out of ceilings, floors and walls. Also, easy-to-install insulation slabs are made from sturdy expanded polystyrene panels. They simply fit under concrete floor slabs to curb heat loss or gain through the foundation.