R Value For Attic Insulation Michigan

Add insulation to attic.

R value for attic insulation michigan.

Your home s age if your home is more than 10 year old you likely need more 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. Achieving greater r values in exterior walls. 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.

The minimum ceiling insulation r values shall be r 24 in zones 5 to 7. Existing 3 4 inches of insulation. As long as you bring your r value up to r 49 you can go online and apply. Where you live different climates require different insulation r values.

The 2015 irc requires r 49 insulation for ceilings with attic spaces. There are many ways to retrofit a home with fiberglass and. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. As a result of being a dte or consumers customer you qualify for standard rebates.

However there is an exception. Special insulation exceptions related to ceilings with attic spaces ceilings without attic spaces masonry veneer and thermally isolated sunrooms are set forth in iecc. Insulation requirements for slab on grade floors is further specified in iecc section 402 2 8. 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.

Dte energy and consumers energy suggest an r 49 or above to be energy efficient. The minimum wall r value shall be r 13 in all zones. Meeting the minimum required thermal performance criteria for both u factor and r value. Complying with the revisions to the michigan uniform energy code muec is easier than you may think.

Recommended insulation levels for retrofitting existing wood framed buildings. You can achieve better thermal performance in your attic by adding an additional layer of insulation. 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. New wall or walls separating a sunroom from conditioned space shall meet the building thermal envelope requirements.

R 408 31065 equivalent u factors. The higher the r value the better the thermal performance of the insulation. For new residential construction projects compliance with the muec can be demonstrated by any of the following.