Wisconsin Attic Insulation Code

Insulation ratings can be improved by adding more layers of insulation.

Wisconsin attic insulation code. Sps 322 39 apply to any dwelling with insulation installed whether or not the insulation is required under this code. Insulation level are specified by r value. Duct insulation supply and return ducts in unconditioned space insulated to a minimum of r 8 hot water pipe insulation heating pipe in unheated spaces shall be insulated with a minimum of r 4. The table below shows what levels of insulation are cost effective for different climates and locations in the home.

You can mix the type and material of insulation too. B an attic access cover shall be weatherstripped and insulated to a level equivalent to the insulation on the surrounding surfaces when the attic is an unconditioned space. Insulation rated at r 60 can place too much weight on a plaster ceiling which can cause the laths under the plaster ceiling below to loosen from the ceiling joists. However there is an exception.

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. A r 38 will satisfy the ceiling r value requirement for a dwelling where the full height of uncompressed r 38 insulation extends over the wall top plate at the eaves. The iecc is the model building code for the united states. An unheated and unfinished attic space in wisconsin needs insulation rated between r 49 and r 60.

The higher the r value the better the thermal performance of the insulation. Achieving greater r values in attics. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. You should select a loose fill r 49 insulation product.

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 first state building code in wisconsin was established in 1914. Comcheck can be used for commercial buildings or high rise 3 stories multi family buildings. The ideal attic insulation r value is different than the ideal wall insulation r value.

R value is a measure of insulation s ability to resist heat traveling through it. Make sure your home is properly insulated in all these locations. This map shows thermal recommended levels of insulation for various climate zones based on recommendations from the u s. The 2015 irc requires r 49 insulation for ceilings with attic spaces.

All of the referenced codes listed below were adopted in the mid to late. Department of energy doe and the international energy conservation code iecc. Recommended levels of insulation. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1.