Attic Insulation R30 Vs R60

While there are also insulation recommendations for walls and floors this article will deal mainly with the oft overlooked attics.

Attic insulation r30 vs r60.

Whoa whoa david oswald you ve just entered the domain of the law of diminishing returns. Home built in 2000. Those up north will want anything from r49 to r60. Here s what i mean.

An r60 attic not so much since the insulation slows the heat loss through the roof. Wall insulation whenever exterior siding is removed on an. Fwiw the recommendation for our region is r30 to r60 in an uninsulated attic so no help there. Add insulation to attic.

Existing 3 4 inches of insulation. Remember r 30 is great insulation and r 60 is over the hill. Another way to estimate the savings is a bit crude but there are 5 loss areas windows and doors walls ceilings floors and foundation and air leakage. For example those in the southernmost part of the us attics should have from r30 to r60 average is r38.

The exterior roof temperatures will often reach the outdoor dew point which can be 10f or more cooler than the overnight air temperatures so you get a bit of free overnight cooling from this lossy roof. 30 grains of black powder will drive that lead ball just fine. 90 grains might be approaching the ma. You ll commonly git a bit more of a bump from moving up from 3 of insulation in practice because that 3 is presumably leaving wood framing exposed between the insulation and the first layer of insulation that covers the wood framing has more of an effect since its breaks the wood framing path r3 6 as a heat leak.

Take a look at the bigger picture and see whether you might be better served by reducing the size of the home finding ways to save on water heating appliances and plug loads or. Change r49 to r60 43. I climbed up to attic and noticed that there are batts of insulation but not much blown in will post a picture. The thermal mass of the attic framing wood roof deck.

On the original question more is better but the crossover from a cost benefit may not be there for r60. The bottom line is that although you can certainly put r 40 insulation under your slab or r 80 insulation in your walls it may not be the smartest thing to do. Attic existing 3 4 inches of insulation uninsulated floor uninsulated wood frame wall insulated wood frame wall 1 r30 to r49 r25 to r30 r13 2 r30 to r60 r25 to r38 r13 to r19 n a 3 r30 to r60 r25 to r38 r19 to r25 and add r5 insulative wall sheathing beneath the new siding 4 r38 to r60 r38 r25 to r30 add r5 insulated. Cut that is half with the extra insulation and you save 50 per year.

Sixty grains even faster. Attic insulation is about r30 rolled batts with some blown in fiberglass above it.