Theoretically and literally, any board that has some insulating ability can be referred to as an insulation board. This is obviously not a practical definition. An insulation board should offer more than just a bit of insulating property. It should adequately prevent loss of energy, in other words dissipation and transfer of heat. An insulation board is mostly needed on the roof, to keep the heat out during summers and in during winters. Here are the most commonly used variants of insulation boards.
• Polyurethane, also known as PUR, is one of the most popular materials used today. Polyurethane insulation board is suitable for flat and pitched roofs. Such boards may have vapour barriers so there is no need for such an additional installation for the whole roof where the insulation board is installed but the seams or gaps should still be sealed with vapour proof tape.
• PIR or polyisocyanurate is an even better option for its greater insulation value. Suitable for pitched and flat roofs, the material is resistant to fire and actually a retardant so it is safer. It will need the gaps to be sealed. The material is also harder than polyurethane so application or installation is more challenging. Some PIR installations need additional foam insulation in certain areas.
• Sheets are often used on roofs. Insulation sheets are not very different from boards. They may use synthetic rigid foams such as polyurethane, rock wool or glass wool. These are lighter and easier to handle as well as install. They are durable and the thermal insulation is reliable. These sheets are resistant to mould but they are also quite expensive. There isn’t much acoustic insulation though.
• You may also choose an insulation board made of mineral wool. You can choose among wood wool, rock wool and glass wool. A few may use a combination of these materials. Such a board is less rigid and hence compressible.