Morris County Roofers: Article About Insulation For Attics
Homeowners who need to have experienced Morris County roofers add insulation to their roof's rafters and eaves have many choices of materials. Some of the most cost effective and longest lasting insulation are spray foams. These materials must be professionally installed, but they also last for as long as the roof does and are highly resistant to the extreme conditions of attic environments. Sprayed foam insulation comes in several types, the most common of which are polyurethane and Icynene.
Polyurethane sprayed foam insulation is a popular choice and has been in use for many decades. This insulation includes two subtypes, which are open cell and closed cell. The open celled variety has a lower R value than other foams, averaging around 4. This kind of insulation is not known to damage the ozone layer but it is made out of petroleum based products. It may leak out some vapors for a few weeks after its installation.
Closed cell polyurethane insulation has some of the highest R values available, at around 9 per inch. It provides dual functions of an insulating material as well as a vapor barrier. If the homeowner wants to install a radiant barrier, too, it can be stapled onto the cured foam. Over the years, some of the chlorofluorocarbons within the closed cells may leak out.
The roofing contractors from Peter W Smith Construction of Morris County NJ would be happy to answer any questions you have about roof repair or gutters.
This can reduce the insulation's R value by 1 or 2. The leaking gasses also are known to cause environmental problems such as depletion of the layer of ozone surrounding the Earth. To meet building code requirements, roofers must install 1/2 inch thick drywall on top of the cured insulation.
Icynene is made out of castor oil, which is a renewable resource. This type of sprayed foam has an open cell construction. This means that its R value is lower than that of polyurethane at around 3 to 4. Open cell foams do not lose any of their R value over time, so homeowners can expect the same quality of thermal protection over the lifespan of the product. No gases are used in the foam, so there are no vapors to leak out. Icynene does not cause any known harmful effects to the environment. The material is highly resistant to fire.
Like polyurethane, Icynene must be topped off with gypsum boards or drywall due to federal building code regulations. In some cases, Icynene over expands, which can cause the drywall to bow or crack, creating an expensive and time consuming cleanup. Mechanical ventilation systems are required for use with any spray foam insulation.