Attic Insulation R Value Michigan

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.

Attic insulation r value michigan.

You first have to ask yourself what do i want to do with my attic space. The r in r value stands for resistance. Your home s age if your home is more than 10 year old you likely need more insulation. You will need a higher r value of insulation if you live in the northeast than if you live in southern california.

The best attic insulation always depends on the way it s applied. Achieving greater r values in exterior walls. Recommended home insulation r values. Resistance to the movement in temperature through walls ceilings and floors in your home or commercial building.

The higher the r value the better the thermal performance of the insulation. Thermally isolated sunroom insulation. R 5 shall be added to the required slab edge r values for heated slabs. Insulation requirements for slab on grade floors is further specified in iecc section 402 2 8.

The table below shows what levels of insulation are cost effective for different climates and. New wall or walls separating a. The higher the r value the better the thermal performance of the insulation. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.

Rule 1063a section r402 2 12 of the code is amended to read as follows. You can achieve better thermal performance in your attic by adding an additional layer of insulation. 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. The minimum ceiling insulation r values shall be r 24 in zones 5 to 7.

There are many ways to retrofit a home with fiberglass and. Table n1102 1 1 r402 1 1 insulation and fenestration table amendments ceilings. 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. Climate zone 5 r38 instead of r49 wood framed walls.

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. The attic insulation and air seal will pay for itself many times over. There s fiberglass and cellulose which are close in r value. Special insulation exceptions related to ceilings with attic spaces ceilings without attic spaces masonry veneer and thermally isolated sunrooms are set forth in iecc.

R value is a measure of insulation s ability to resist heat traveling through it. R 408 31063a specific insulation requirements prescriptive. The minimum wall r value shall be r 13 in all zones. A common differentiating criteria between different types of insulation is the amount of r value they provide when correctly.