Fiberglass is a type of fiber reinforced plastic where the reinforcement fiber is specifically glass fiber. Insulation is generally measured in R-value. R meaning resistance to heat flow. The higher the R- value the longer you retain your heat. If you have an R-19 the heat will stay 19 times longer than without insulation… R-30 will be 30 times longer and so on. There are a wide variety of brand names of insulation and all are the same for thickness and quality. Most companies use a dye to make it identifiable.
Fiberglass Batted Insulation
Fiberglass batted insulation usually comes two ways. You have unfaced batts and kraft faced batts. Most if not all municipalities require a vapor barrier (retarder). With kraft faced insulation you have your vapor barrier. With the unfaced batts we usually will cover it with a 6 mil poly vapor barrier (plastic). It can also be covered with a foil faced rigid board (i.e. Thermax, Celotex, etc). Fiberglass batts usually comes in 2 widths to accommodate the framing of your structure. In addition to its thermal properties it also provides excellent acoustical performance.
Roxul Batted Insulation
Another type of batted insulation is a product called Roxul. Roxul is water repellent. Does not support mold growth. Roxul is fire resistant and can withstand temperatures up to 2150 degrees Fahrenheit. Roxul is comprised of 40% recycled material. It is made from natural stone and steel slag. It is also free of carbon, fluorine and chlorine. Roxul is an excellent sound barrier as well as a higher r value per inch than standard fiberglass batts.
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