Is R 30 Insulation Good

Whoa whoa david oswald you ve just entered the domain of the law of diminishing returns.

Is r 30 insulation good.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed in your attic to reach r 30 if you live in zones 2 or 3. Here s what i mean. Owens corning r 30 unfaced 16 by 48 fiberglass batt insulation fits 2x10 floor or attic a total of 8 bags and square footage of 426 64 ft 5 0 out of 5 stars 1 456 20 456. R value is the temperature difference per unit of heat flux needed to sustain one unit of heat flux between the warmer surface and colder surface of a barrier under steady state.

90 grains might be approaching the ma. Insulation insulation material when properly used can make your home more comfortable and energy efficient and can significantly reduce heating and cooling bills throughout the year. Insulation level are specified by r value. In the context of building and construction the r value is a measure of how well a two dimensional barrier such as a layer of insulation a window or a complete wall or ceiling resists the conductive flow of heat.

Set your store to see local availability add to cart. The higher the r value the better the thermal performance of the insulation. If the joists are 10 inches deep the cavity can take high density r 30 insulation which is 8 1 2 inches thick more than enough for floor insulation. The table below shows what levels of insulation are cost effective for different climates and.

Material type r value cost per square foot cost per square foot per r value fiberglass batt 3 5 12 inches thick 13 0 20 to 0 40 0 02 30 0 60 to 1 00 0 03. Knauf insulation r 30 ecoroll unfaced fiberglass insulation roll 23 in. Since i have no insulation i should see a huge difference in comfort and bills just from the r 30. 30 grains of black powder will drive that lead ball just fine.

Department of energy rates r 13 insulation as good for use in walls in southern areas of the country it rates r 19 insulation higher designating it as great that is because r 19 insulation provides more thermal insulation than r 13 does. 12 rolls model 689972 528 82 pallet 528 82 pallet delivery unavailable. R 30 ecobatt unfaced fiberglass insulation batt 24 in. Thanks for your help.

Looks like r 38 to r 49 is more the current minimum. Recommended home insulation r values. If the garage is open to the rafters the boards that support the roof use r 38 insulation between the rafters at the roof if they are 10 inches deep. Sixty grains even faster.