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.

Is r13 insulation good for attics.

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 level are specified by r value. Once you ve decided which type is best for you examine the material options and prices to home in on the right product. If you have a breeze going through your attic from soffit or roof vents it will degrade the r value of exposed fiberglass insulation.

Loose fill or batt the common term for blanket insulation. For diy attic insulation you ve got two choices. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. An existing house with r 13 in the attic and installing r 30 v r38 is a no brainer.

Leeseptember 13 2007 at 1 00 pm. Building new hame same answer. Installing additional insulation from r 30 to r 38 not so much. 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 higher the r value the better the thermal performance of the insulation. 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. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

Insulation r value is only valid in still air. Both can be added to uninsulated attics or layered over existing material. 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. What is the right insulation for an attic.

Find the owens corning pink 3 1 2 in. 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.