Red Seal Roofer Practice Exam 2025 – Complete Test Preparation

Rigid foam board is a type of roofing insulation due to its composition and properties that effectively reduce heat transfer between the attic and the rooftop. This type of insulation provides a high R-value per inch of thickness, which means it is excellent at resisting heat flow, thereby helping to maintain temperature within the building. Rigid foam boards are commonly used in various roofing applications, including flat and low-slope roofs, where they can be placed in one continuous layer to minimize thermal bridging and enhance energy efficiency.

In contrast, shingle board is primarily a structural component used for support and is not designed for insulation. Felt paper serves as an underlayment or moisture barrier in roofing systems, contributing more to water resistance than thermal insulation. Lastly, roofing membrane provides weatherproofing and protection from the elements but does not serve the insulation function characteristic of rigid foam boards.