When properly installed, roof insulation boards can help increase the energy efficiency of a structure. They are also a critical component to minimizing moisture, mold, fire resistance and air quality issues that may arise over the course of a roof’s life span.

There are many types of rigid insulation available in the market. These include wood fiber, perlite, polyisocyanurate and gypsum board. Wood fiber insulation is an organic insulating board composed of wood or bayasse (cane) fibers combined with fillers and binders. It can be both uncoated or asphalt impregnated to enhance its moisture resistance. Often, it is necessary to install a vapor barrier with this type of insulation.

Exploring Roof Insulation Boards: Pros, Cons, and Best Practices

Expanded Polystyrene (XPS) insulation is a closed-cell foam plastic insulating board. It is blown by a blowing agent into the facer of choice, such as oriented strand board (OSB), paper facers, or glass-fiber mat facers. XPS is known for its ability to withstand high temperatures and retain its insulating value after exposure to moisture. It is ideal for use under a variety of single-ply roofing membranes.

Polyiso insulation is a rigid insulation made up of a high-density, closed-cell foam core that is bonded to both the facer and backer of a composite panel. It is designed to provide an R-value of up to R-23.6. It is compatible with both metal and non-metal, nailable and non-nailable roof decks, as well as most commercial roof membrane systems. It is a great solution for use on metal buildings due to its superior moisture resistance and can withstand a variety of climate conditions.