Rigid Board Insulation

Rigid board finds its application in roofs, ceilings, foundations, floors, around pipes and tanks; apart from being used between studs on interior and concrete walls. The U-value of the insulation differs according to the thermal resistance of different materials. Polystyrene, polyisocyanurate or polyiso, and polyurethane are the common materials used for rigid foam board insulation. Here is a brief information on each of these materials and installing foam board insulation.

Polystyrene
Molded expanded polystyrene foam board (MEPS) is a closed cell material, commonly known as beadboard. It requires extreme heat and pressure to be molded into sheets.

Polyurethane
Similar to polyisocyanurate or polyiso foam board, Polyurethane (PUR) foam board is also a closed-cell insulation material which contains the HCFC low-conductivity gas in its cells. These boards are also available in liquid sprayed foam and rigid foam board. Using metal foil facings or reflective foil; the U value can be sustained for a longer period of time, allowing maximum retention of heat. Plaster board bonding can further enhance the quality and strength of polyurethane foam board.

Polyisocyanurate
Polyisocyanurate (PIR) is produced by the same manufacturing process as that used in the manufacture of polyurethane (PUR) but different ratios of the components are used. As a result, isocyanurate is formed which gives the material greater heat stability. Polyisocyanurate (PIR) is similar to polyurethane but can contain long strand glass fibres within the PIR core which is formulated to give off less dense smoke in fire.

Cost:
Rigid foam board insulation, although a bit costlier than other types of insulation is ideal for places which lack in space. Its low thermal consuctivity values make it more efficient for home improvement, than its other counterparts, which have the same thickness.

Installation:
The maximum thermal performance or U-value of blanket insulation depends heavily on proper installation. Therefore, it's best to have a certified insulation installer do it. If you want to install the insulation yourself, carefully follow instructions and the necessary safety precautions. The insulation's manufacturer may offer instructions. You may also need to check Part L of the Building Regulations.

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