What Is The Best Insulation for Roof

An important part of a new roof or a roof replacement is selecting the right insulation. Without the best insulation for your roof, you could experience trouble keeping your home warm in the winter or cool in the summer. Insulation is material under the roof decking in the attic that helps to keep your home comfortable and energy efficient. Here are some things to consider when looking for the best insulation for your roof.

Importance of Roof Insulation

roof insulation installationThe main role of insulation is to provide resistance to heat flow which keeps your home warm in the winter and cooler in the summer. This helps make your home more comfortable and saves you money on energy bills. Insulation has other important benefits as well:

● Keeps moisture out
● Prevents mold growth
● Reduces noise from outside
● Increases the lifespan of your roof


When you are preparing to install insulation it is important to know the recommended R-Value for your region.

R-Value is the resistance to heat flow provided by the insulation. A high R-Value provides more resistance and therefore has more insulating power. Depending on your region the recommended R-Value can range from R30 (minimal) to R60 (maximal).

Types of Roof Insulation

There are several different types of insulation to consider for your roof. The best insulation for your home will depend on the region you live in, attic accessibility, and your budget.

Spray Foam Insulation

This type of insulation is made from polyurethane or latex and it is sprayed directly on the underside of the roof deck. This style of application helps to seal cracks and block moisture, providing good insulation. Spray foam has a range of R-Values, and is effective and long-lasting, but it must be professionally installed.

Batt Insulation

This is a lower-cost choice for insulation. It is commonly made from fiberglass or mineral wool and is available in varying thicknesses. The R-Value is typically between 2.9 and 3.8 per inch. The material is usually flame resistant and helps reduce outside noise. You can install fiberglass insulation yourself, but the material can cause irritation if not handled properly.

Loose-Fill Insulation

Made from fiberglass, cellulose, or recycled materials, this type of insulation is blown into the space using a tube. This is great for small and hard-to-reach spaces. Depending on the material, this insulation can have low or high R-Values. You can also control the amount of insulation to get the appropriate amount for your region’s climate.

Structural Insulated Panels

Also called SIPs, this insulation is essentially plywood panels with insulation between them. These panels are most easily installed during roof replacement or new roof installation. SIPs have a high R-Value and can dramatically reduce energy costs. They must be professionally installed.

If you’re not sure which type of insulation is best for your home, consult a professional roofing contractor for advice on choosing and installing insulation.

Reliable Roofing Services in Southern Maine

The professionals at The Roof Doctors are knowledgeable about all aspects of proper roofing services including insulation. We provide unparalleled roofing services to the Greater Portland area and throughout Maine.  For help with a new roof or a roof replacement, call The Roof Doctors at (207) 772-2719.

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