Is R13 Insulation Good For Attics

Air migrates from warmer spaces toward colder spaces and insulation is designed to help prevent or at least slow that migration.

Is r13 insulation good for attics.

Floors and crawl spaces need a lower r value than attics but they still require a higher value than walls. 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. 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.

R value is a measure of insulation s ability to resist heat traveling through it. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. What is the best r rating for insulation. Both can be added to uninsulated attics or layered over existing material.

The table below shows what levels of insulation are cost effective for different climates and locations in the home. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. 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. For diy attic insulation you ve got two choices.

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. Leeseptember 13 2007 at 1 00 pm. 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. Find the owens corning pink 3 1 2 in.

An existing house with r 13 in the attic and installing r 30 v r38 is a no brainer. If you have a breeze going through your attic from soffit or roof vents it will degrade the r value of exposed fiberglass insulation. 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. Insulation level are specified by r value.

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. Insulation r value is only valid in still air.