Attic Insulation R38 Vs R49

Enter your data into the fields where indicated. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. The law of diminishing returns tells me that r49 isn t much better than r39 and r60 probably even more so.

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Attic insulation r38 vs r49.

Get free shipping on qualified r38 r49 insulation or buy online pick up in store today in the building materials department. We re trying to be as environmentally smart as possible and i m not sure who to believe. Existing 3 4 inches of insulation. Eere information center 1 877 eere info 1 877 337 3463.

Use this insulation savings calculator to measure the financial impact of increasing your insulation performance. Sixty grains even faster. Wall insulation whenever exterior siding is removed on an. R49 to r60 r38 to r49 r25 to r30 and add r5 to r6 insulative wall sheathing beneath the new siding 6 7 8 whenever exterior siding is removed from an uninsulated wood frame wall drill holes in the sheathing and blow insulation into the empty wall cavity before installing the new siding.

Here s what i mean. I ve read it should be r 49 or higher for optimal effectiveness. 90 grains might be approaching the ma. We re having our attic blown w insulation.

30 grains of black powder will drive that lead ball just fine. I have a 6 year old home with about 12 inches r 30 of blown in insulation in the attic. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. 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.

Recently door to door sales representatives for an insulation company offered a free inspection and quote to add additional insulation. Our gc says r 38 is what they usually use in this area and that s good enough. 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. I like our gc but he.

Whoa whoa david oswald you ve just entered the domain of the law of diminishing returns. Add insulation to attic.

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