Attic Insulation R Value Michigan

You first have to ask yourself what do i want to do with my attic space. Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. A common differentiating criteria between different types of insulation is the amount of r value they provide when correctly.

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Depending on where you live and the part of your home you re insulating walls crawlspace attic etc you ll need a different r value.

Attic insulation r value michigan.

The higher the r value the better the thermal performance of the insulation. Achieving greater r values in exterior walls. Insulation requirements for slab on grade floors is further specified in iecc section 402 2 8. The best attic insulation always depends on the way it s applied.

R 5 shall be added to the required slab edge r values for heated slabs. You can achieve better thermal performance in your attic by adding an additional layer of insulation. The attic insulation and air seal will pay for itself many times over. Insulation level are specified by r value.

Where you live different climates require different insulation r values. You will need a higher r value of insulation if you live in the northeast than if you live in southern california. There are many ways to retrofit a home with fiberglass and. The minimum ceiling insulation r values shall be r 24 in zones 5 to 7.

Table n1102 1 1 r402 1 1 insulation and fenestration table amendments ceilings. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. R value is a measure of insulation s ability to resist heat traveling through it. Insulation r value requirements for michigan what is r value.

New wall or walls separating a. The table below shows what levels of insulation are cost effective for different climates and. Climate zone 6 and 7 r20 or r13 5 instead of r20 or r13 10 and first value is cavity insulation second is continuous insulation or insulated siding so 13 5 means r 13 cavity insulation plus r. Recommended home insulation r values.

The higher the r value the better the thermal performance of the insulation. There s fiberglass and cellulose which are close in r value. Your home s age if your home is more than 10 year old you likely need more insulation. The r in r value stands for resistance.

Climate zone 5 r38 instead of r49 wood framed walls. Resistance to the movement in temperature through walls ceilings and floors in your home or commercial building. Typical recommendations for exterior walls are r 13 to r 23 while r 30 r 38 and r 49 are common for ceilings and attic spaces. The minimum wall r value shall be r 13 in all zones.

Special insulation exceptions related to ceilings with attic spaces ceilings without attic spaces masonry veneer and thermally isolated sunrooms are set forth in iecc. Thermally isolated sunroom insulation. R 408 31063a specific insulation requirements prescriptive. Rule 1063a section r402 2 12 of the code is amended to read as follows.

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