Attic Insulation R38 Vs R49

Recently door to door sales representatives for an insulation company offered a free inspection and quote to add additional insulation.

Attic insulation r38 vs r49.

While there are also insulation recommendations for walls and floors this article will deal mainly with the oft overlooked attics. 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. The law of diminishing returns tells me that r49 isn t much better than r39 and r60 probably even more so. Here s what i mean.

Whoa whoa david oswald you ve just entered the domain of the law of diminishing returns. 90 grains might be approaching the ma. Eere information center 1 877 eere info 1 877 337 3463. 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.

Inspecting your attic insulation. Existing 3 4 inches of insulation. I have a 6 year old home with about 12 inches r 30 of blown in insulation in the attic. 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.

Those up north will want anything from r49 to r60. For example those in the southernmost part of the us attics should have from r30 to r60 average is r38. 30 grains of black powder will drive that lead ball just fine. The more you use the better insulated your home will be.

Get free shipping on qualified attic r38 fiberglass insulation or buy online pick up in store today in the building materials department. Wall insulation whenever exterior siding is removed on an. Add insulation to attic. Get free shipping on qualified r38 r49 insulation or buy online pick up in store today in the building materials department.