Wisconsin Attic Insulation Code

In most areas the international residential code calls for 1 square foot of ventilation per 150 square feet of attic floor space.

Wisconsin attic insulation code.

Sps 322 10 wisconsin administrative code 60 published under s. Entire code is always current. You can mix the type and material of insulation too. Where the design of the roof or ceiling assembly does not allow sufficient space for the required r 49 insulation the minimum required insulation for the roof or ceiling assembly shall be r 30.

If a home s roof has a very steep pitch and thus greater attic volume the suggested amount should be increased by. If you think you re among the 90 of us homes that are under insulated 1 performing a simple insulation inspection will help you determine your insulation needs. Stats by the legislative reference bureau. The register date on each page register may 2016 no.

Insulation level are specified by r value. Achieving greater r values in attics. Updated on the first day of each month. Having the correct amount of attic insulation can help you maintain a comfortable temperature throughout your home and help save money on your energy bills plus prevent major issues like ice dams in the winter.

Sps 322 01 3 b b the vapor retarder requirements under s. No energy cost savings for wisconsin resulting from the state updating its commercial and residential building energy codes in accordance with federal law are significant estimated to be on the order of nearly 170 million annually by 2030. As described above the 1 square foot should be divided equally between intake and exhaust. Make sure your home is properly insulated in all these locations.

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. However there is an exception. The 2015 irc requires r 49 insulation for ceilings with attic spaces. Sps 322 38 do not apply to an unheated space such as an attached unheated garage.

Sps 322 39 apply to any dwelling with insulation installed whether or not the insulation is required under this code. R value is a measure of insulation s ability to resist heat traveling through it. This reduction of insulation shall be limited to 500 square feet of ceiling area. The higher the r value the better the thermal performance of the insulation.

The ideal attic insulation r value is different than the ideal wall insulation r value. Insulation ratings can be improved by adding more layers of insulation. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1. The table below shows what levels of insulation are cost effective for different climates and locations in the home.