Is R13 Insulation Good For Attics

Insulation level are specified by r value.

Is r13 insulation good for attics. What is the right insulation for an attic. Again when choosing insulation the r value that you need depends on where you live and what part of your home you need to insulate attics need insulation with a much higher r value than walls. Find the owens corning pink 3 1 2 in. 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.

R value is a measure of insulation s ability to resist heat traveling through it. Floors and crawl spaces need a lower r value than attics but they still require a higher value than walls. Insulation r value is only valid in still air. Air migrates from warmer spaces toward colder spaces and insulation is designed to help prevent or at least slow that migration.

Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. Building new hame same answer. R13 kraft faced batts in bags fiberglass insulation 372823 moisture resistant energy efficient and comfortable cuts heating and cooling loss easy install at the home depot. The material cost is minimal compared to the fixed costs of the contractor to do either or your time to pickup a blower and material.

If you have a breeze going through your attic from soffit or roof vents it will degrade the r value of exposed fiberglass insulation. Leeseptember 13 2007 at 1 00 pm. 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. Both can be added to uninsulated attics or layered over existing material.

What is the best r rating for insulation. If your exterior walls are constructed from 2 by 4 inch studs the most insulation that can go into the wall while retaining its r value is r 13 or r 15 as these are both made to fit a cavity 3 1 2 inches deep. The higher the r value the better the thermal performance of the insulation. Installing additional insulation from r 30 to r 38 not so much.

For diy attic insulation you ve got two choices. The table below shows what levels of insulation are cost effective for different climates and locations in the home.