Developing Your Home and Garden

3 Top Performing Roofing Insulation Materials

Most homeowners focus on wall insulation to improve their heating requirements and reduce their energy bills. However, few homeowners know about roof insulation and might not take their time to learn about it. An insulation system that extends to the roof is arguably the best option any modern homeowner. Not only does it enhance the roof's performance, but it also delivers the desired thermal needs. However, roofers offer several roof insulation materials and choosing one can be challenging. This article highlights some of the top-performing roof insulation materials in the market today.


Polyisocyanurate is a closed-foam plastic insulating material commonly seen in modern homes. The foam is a core that is sandwiched between either organic or inorganic materials that might include glass fibre facers or felt facers. During application, roofers blow a chlorine-free agent into the foam plastic which causes it to expand, thereby filling the space between facers. When fully inflated, polyisocyanurate creates a closed-cell structure that is attributed to the material's high thermal properties. However, there is a possibility that air might enter a cell structure during the application phase, which might slightly reduce the thermal resistance of polyisocyanurate over time. Despite this, polyisocyanurate still ranks high in thermal resistance compared to other materials.

Gypsum Board

Another roof insulation material that has become popular among homeowners is gypsum board. Its non-structural properties make it the go-to insulation material for irregular roofs because its shape can be manipulated easily. Additionally, a gypsum board's non-combustible core panel makes it the ideal fire deterrent material. It might explain why gypsum board is the roofing insulation of choice for homes that are constructed in bushfire-prone regions of Australia. Gypsum board does not absorb water readily; therefore, roofers and homeowners alike prefer to use it as a vapour retarder substrate. Its water-resistant properties are particularly crucial for timber-framed walls where moisture is a threat to roof trusses and beams. Generally, gypsum boards come with a non-asphaltic coating which improves a roof membrane during application.

Wood Fibre

Wood fibre is a natural and organic roof insulation material. The material consists of wood shavings and cane mixed with binders. Since wood readily absorbs moisture, wood fibre is impregnated with asphalt to reduce its moisture absorption properties and enhance its insulation properties. Wood fibre is particularly excellent for buildings that are made from timber because framers can turn the scrap wood into insulation material. Therefore, wood fibre insulation is cheap and it eliminates waste in timber construction.

Which material is right for you? Contact roof insulation services to learn more.