Attic Insulation Requirements Indiana

Inspecting your attic insulation.

Attic insulation requirements indiana.

Access doors from conditioned spaces to unconditioned spaces e g attics and crawl spaces shall be weatherstripped and insulated to a level equivalent to the insulation on the surrounding surfaces. Your attic should have a certain amount of insulation in it and the recommended level of insulation for your attic is dependent on where you live. N1101 4 1 blown or sprayed roof ceiling insulation. First things first you need to go up into your attic inspect the condition of the insulation and calculate the current level of insulation.

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. The thickness of blown in or sprayed roof ceiling insulation fiberglass or cellulose shall be written in inches mm on markers that are installed at least one for every 300 ft 2 28m 2 throughout the attic space. Recommended insulation levels for retrofitting existing wood framed buildings. The markers shall be affixed to the trusses or joists and marked with the minimum initial installed thickness with numbers a minimum of 1 inch 25 mm high.

The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. In other words the desired inside temperature remains and the undesirable outside temperature stays well outside. Add the right kind of insulation when adding additional insulation you do not have to use the same type of insulation that currently exists in your attic. Insulation requirements for crawl space walls are further specified in iecc section r402 2 10.

Insulation requirements for slab on grade floors are further specified in iecc section r402 2 9. Existing 3 4 inches of insulation. Ventilation openings having a least dimension larger than 1 4 inch 6 4 mm shall be provided with corrosion resistant wire cloth screening hardware cloth perforated vinyl or similar material with openings having a least dimension of 1 16 inch 1 6 mm minimum and 1 4 inch 6 4 mm maximum. Insulation institute association provides resources and information on spray foam rockwool and fiberglass insulation insulation r values building code changes as well as instructions for homeowners and building professionals when installing insulation in attics ceilings and other interior locations.

Floor insulation must be installed to maintain contact with the underside of the subfloor decking.