The chief measure of the value of any insulation is its R-Value. The purpose and design of insulation is to check the outflow of heat. The more heat the insulation stops, the higher the R-Value of that insulation.
For any given thickness, spray insulation has a much higher R-value then does fiberglass batt insulation. In other words, 2 inches of spray foam will insulate your roof better than 2 inches of fiberglass batts.
Cellulose fill, either blown-in or applied by hand, also has a higher R-value than fiberglass batts at the same thickness. This still doesn’t compare to the R-value of spray foam insulation though, as it is almost twice as high as the cellulose fill insulation of a comparable thickness.
R-value is truly important yes, but it is not the only factor that you want to bring into consideration when trying to choose the best insulation for your home. Moisture will cause both fiberglass batts and cellulose fill to lose R-value. Just a small amount of moisture is enough to cancel out the insulating properties of fiberglass batt and cellulose.
Neither cellulose fill or fiberglass will be able to give you the 100% caverage that you really need with your insulation The fact that heat is allowed to pass through these gaps is obvious, but these facts are not computed into the R-values of these two materials. In other words, the actual R-value of installed fiberglass batt or cellulose fill roof insulation is lower than the listed R-value.
Benefits of Spray Foam Insulation
There are no adverse actions of spray foam if it gets some moisture on it. SPray foam can even in actuality help to prevent leaks in your roof as it effectively expands to fill up every crack and crevice in your roof thus effectively sealing it off. If for some reason your home is exposed to pollutants or other harmful airborne things, your foam insulation will effectively keep it out whereas the gaps that are left behind with the fiberglass and cellulose will let it through.
Probably the most beneficial aspect of spray foam insulation is the fact that you can get it done for around the same cost as your traditional types of insulation materials.
Read more on spray foam insulation kits
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