Get the Most Value from Your Roof Insulation
The basic gauge of the effectiveness of any insulation is its R-value. Insulation is designed to stop the flow of heat. The more heat the insulation stops, the higher the R-value of that insulation.
When compared to fiberglass batt insulation, spray foam insulation has a higher R-value at a given thickness. 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. But, again, the R-value of spray foam insulation is almost twice as high as cellulose fill insulation of the same thickness.
Beware the Moisture
As important as R-value is in how well insulation works, it is not the only thing to consider when choosing the best roof insulation. Moisture will cause both fiberglass batts and cellulose fill to lose R-value. Even slight moisture, that you cant see or feel, can reduce the R-value of fiberglass batts.
Neither fiberglass batts or cellulose fill insulation can seal every gap in your roof. Heat can pass through the open gaps and this reduces the R-value of the insulation, although the R-values listed for fiberglass or cellulose do not take this into consideration. In other words, the actual R-value of installed fiberglass batt or cellulose fill roof insulation is lower than the listed R-value.
The Benefits of Spray Foam Insulation
Spray foam insulation is not affected by moisture. In fact, it can stop minor leaks because, when it is applied, spray foam insulation spreads to fill every gap and seal your roof. Pollutants and other airborne irritants that might get through the gaps left by batts and fill are kept out by spray foam insulation.
Perhaps best of all, insulating your roof with spray foam insulation costs about the same as other insulations.
The spray foam roof insulation specialists at Foam Comfort have the experience you need to get the most from your insulation.