Fiberglass Insulation


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.

Energy Codes

Energy codes in our state require certain R values within the building envelope of your home.  An R-20 in your exterior walls.  This can be done with fiberglass batts now by using a high density batt of R-21. Other products available, see below for Roxul.  There are other ways of doing this with rigid foam board on the interior or exterior of your home.  For spray foam applications, please refer to our spray foam page.

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