R Value For Attic Insulation Michigan

R 38 shall be deemed to satisfy the requirement for r 49 wherever the full height of uncompressed r 38 insulation extends over the wall top plate at the eaves.

R value for attic insulation michigan.

You will need a higher r value of insulation if you live in the northeast than if you live in southern california. The minimum ceiling insulation r values shall be r 24 in zones 5 to 7. R 408 31065 equivalent u factors. Your home s age if your home is more than 10 year old you likely need more insulation.

There are many ways to retrofit a home with fiberglass and. Energy star states that an r 60 is equal to the best performing attic insulation. You can achieve better thermal performance in your attic by adding an additional layer of insulation. Alternately the insulation installers shall provide a certification listing the type manufacturer and r value of insulation installed in each element of the building thermal envelope.

Injection foam insulation s higher r value with an r value of 4 0 to 5 1 per inch depending on the manufacturer pre expanded injection foam provides a higher r value than fiberglass or cellulose and it seals the building from air leakage at the same time. For new residential construction projects compliance with the muec can be demonstrated by any of the following. Special insulation exceptions related to ceilings with attic spaces ceilings without attic spaces masonry veneer and thermally isolated sunrooms are set forth in iecc. Add insulation to attic.

Where you live different climates require different insulation r values. The 2015 irc requires r 49 insulation for ceilings with attic spaces. The minimum wall r value shall be r 13 in all zones. An r value identification mark shall be applied by the manufacturer to each piece of building thermal envelope insulation 12 inches 305 mm or greater in width.

Existing 3 4 inches of insulation. R 5 shall be added to the required slab edge r values for heated slabs. Recommended insulation levels for retrofitting existing wood framed buildings. New wall or walls separating a sunroom from conditioned space shall meet the building thermal envelope requirements.

Meeting the minimum required thermal performance criteria for both u factor and r value. Insulation requirements for slab on grade floors is further specified in iecc section 402 2 8. Achieving greater r values in exterior walls. However there is an exception.

The higher the r value the better the thermal performance of the insulation. Dte energy and consumers energy suggest an r 49 or above to be energy efficient. As long as you bring your r value up to r 49 you can go online and apply.