Attic Insulation R38 Vs R49
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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.
Attic insulation r38 vs r49. Whoa whoa david oswald you ve just entered the domain of the law of diminishing returns. Recently door to door sales representatives for an insulation company offered a free inspection and quote to add additional insulation. Those up north will want anything from r49 to r60. Here s what i mean.
The law of diminishing returns tells me that r49 isn t much better than r39 and r60 probably even more so. Wall insulation whenever exterior siding is removed on an. Eere information center 1 877 eere info 1 877 337 3463. A ceiling insulated with r 49 insulation will have an r factor of about 54 i e 49 5 and let through 5 54 of the energy or about 9.
Add insulation to attic. So a ceiling with r 38 insulation will have a total r value of about 43 i e 38 5 and will let through about 5 43 or about 12 of the amount that an uninsulated one will. 30 grains of black powder will drive that lead ball just fine. 90 grains might be approaching the ma.
The more you use the better insulated your home will be. For example those in the southernmost part of the us attics should have from r30 to r60 average is r38. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live.
Get free shipping on qualified attic r38 fiberglass insulation or buy online pick up in store today in the building materials department. Existing 3 4 inches of insulation. Sixty grains even faster. Get free shipping on qualified r38 r49 insulation or buy online pick up in store today in the building materials department.
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