What is roof insulation?
Insulation helps to maintain the proper temperature inside the structure. It acts like a shield against external heat gain and loss. There are many kinds of insulation:
The R-value is the standard measurement for determining the effectiveness of roof insulation. R-value can be calculated by multiplying the actual heat loss rate (h/s) with the R-value: R-value = Actual / Effective. The three types are: Foam Insulations Commonly used in sprayed or blown on foam materials commonly used in rolled or pitched roofing products such as shingles, tiles, asphalt and slate tiles, fiberglass and ceramic tiles. R-values vary for different types of roofing materials.
The most commonly used and effective form of roof insulation. As fiberglass has low thermal conductivity, it is the best choice for insulating buildings. Low R-value means more heat is lost from the structure. Foam Insulations Commonly used as roofing material but also used in wet rooms and attics, it is made of foam materials commonly used in spray foam products and roofing shingles, which have high R-value.
Flush Membranes Commonly used in attic systems, these are foam boards which are then stacked one above the other. This creates pockets where air can pass through. They are effective in reducing external heat gain because they trap heat below the structure. Foam Insulations Commonly used in spray foam products and roofing shingles, these are made of foam materials commonly used in rolled or pitched roofing materials such as gypsum, crystalline silica and cellulose. Heat Sealing Membranes Also used in attic systems, these are foam boards which are then stacked one above the other.
Mineral Wool Insulations
These are the most effective form of roof insulation due to their high R-value. These are made of natural minerals such as wool, corn, coal, clay and other granular materials which are mixed with adhesive. Heat and sound waves can pass through the insulation, which keeps the inside cool. This type of insulation is also effective in preventing moisture buildup on the surface. Heat Sealing Membranes Often used in attics, these are foam boards which are then stacked one above the other.
Installed over existing roof insulation, these are known as Loose-Fill Roof Insulation. They are generally made of cellulose or rolled cellulose products that are applied to the roofing surface with a compressor. After they’re applied, they will set, harden and then bond to the surface of the roof. The units will last for many years and provide superior energy efficiency. Other forms of roof insulation include loose-fill, mineral wool, thermal roll and loose-fill membrane. Regardless of which form of roof insulation you choose, it’s important to do your research and speak with a reputable contractor so you get a system that works best for your home.