Polyisocyanurate is a type of rigid foam insulation that is widely used in the construction industry for its excellent thermal performance. It is made from a blend of isocyanurate and polyurethane, and is available in both board and spray foam forms.

One of the biggest advantages of polyisocyanurate insulation is its high R-value, which is a measure of the material's thermal resistance. Polyisocyanurate insulation has an R-value of around R-6 to R-8 per inch, making it one of the most effective insulation materials available. This means that less insulation is needed to achieve the same level of thermal performance, which can help reduce material and installation costs.

Another advantage of polyisocyanurate insulation is its fire resistance. It has a low flammability rating and produces less smoke and toxic gases in the event of a fire compared to other types of insulation materials. This makes it a popular choice for commercial and industrial buildings that require strict fire safety standards.

Polyisocyanurate insulation is also resistant to water and moisture, which can help prevent mold growth and damage to the insulation material. This is important in areas with high humidity or moisture levels, such as in basements or crawl spaces.

However, it is important to note that polyisocyanurate insulation is not suitable for all applications. It can be prone to shrinkage over time, which can cause gaps and reduce the material's effectiveness. Additionally, it can be more expensive than other insulation materials, which can impact the overall project budget.

Overall, polyisocyanurate insulation is a versatile and effective insulation material that provides excellent thermal performance, fire resistance, and moisture resistance. It is a popular choice for a wide range of commercial and residential applications.