What is the right insulation for an attic.
Is r13 insulation good for attics.
The higher the r value the better the thermal performance of the insulation.
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.
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.
For diy attic insulation you ve got two choices.
Once you ve decided which type is best for you examine the material options and prices to home in on the right product.
An existing house with r 13 in the attic and installing r 30 v r38 is a no brainer.
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.
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.
Leeseptember 13 2007 at 1 00 pm.
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.
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.
Building new hame same answer.
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.
Air migrates from warmer spaces toward colder spaces and insulation is designed to help prevent or at least slow that migration.
If you have a breeze going through your attic from soffit or roof vents it will degrade the r value of exposed fiberglass insulation.
Installing additional insulation from r 30 to r 38 not so much.
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