Is R13 Insulation Good For Attics

What is the right insulation for an attic.

Is r13 insulation good for attics.

Building new hame same answer. The higher the r value the better the thermal performance of the insulation. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. R value is a measure of insulation s ability to resist heat traveling through it.

What is the best r rating for insulation. Find the owens corning pink 3 1 2 in. Both can be added to uninsulated attics or layered over existing material. Leeseptember 13 2007 at 1 00 pm.

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. For diy attic insulation you ve got two choices. Insulation level are specified by r value. 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.

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. Installing additional insulation from r 30 to r 38 not so much. If you have a breeze going through your attic from soffit or roof vents it will degrade the r value of exposed fiberglass insulation. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation.

Air migrates from warmer spaces toward colder spaces and insulation is designed to help prevent or at least slow that migration. Insulation r value is only valid in still air. Floors and crawl spaces need a lower r value than attics but they still require a higher value than walls. An existing house with r 13 in the attic and installing r 30 v r38 is a no brainer.

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. 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.