Halt Action Group Blog Types of Roof Insulation Board

Types of Roof Insulation Board

When selecting roof insulation board for your project, it’s important to evaluate factors like desired R-value, moisture protection and acoustic properties. Read on to learn more about the different types of insulation products available to meet your specific roofing needs.

Rigid board insulation is the most common type of insulation used in commercial low-slope roof assemblies. It consists of cellular plastic or fibrous materials that are pressed into boards and applied to the top surface of the roof deck. In most applications, a cover board is placed over the primary layer of thermal insulation to prevent moisture absorption and face delamination that could shorten the life expectancy of the membrane.

Choosing the Right Roof Insulation Board: A Comprehensive Overview

There are two types of rigid foam insulation: expanded polystyrene (EPS) and extruded polystyrene (XPS). EPS is a cost-effective choice that can be cut to fit any space. It is also water-resistant, making it ideal for projects that will be exposed to moisture over time. Extruded XPS is a high-performance rigid insulation that offers superior durability and thermal efficiency. It has lower water permeability and higher strength than EPS, making it a great choice for projects that will be exposed to heavy foot traffic or mechanical fasteners.

Spray-in-place polyisocyanurate (ISO) insulation is a versatile option that can be used for new construction or re-roofing. It consists of a foam core bonded to face sheets of fiberglass, OSB or other materials. It is often used as a cover over metal roof systems and can be installed under a variety of roofing membranes.

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