How Much Attic Insulation Should I Have
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According to home advisor insulating your attic can cost between 1700 to 2100.
How much attic insulation should i have. Input length width and desired r value of the area to be insulated. That said air resistance and interference such as vent grates reduces the area of true ventilation. Generally speaking you need a ratio of 1 300 where for every 300 square feet of ceiling space you need 1 square foot of attic ventilation. This calculator is to be used as an estimating tool only.
According to the u s. R value is a measure of insulation s ability to resist heat traveling through it. 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. Fiberglass and cellulose insulation have r values of 2 9 to 3 8 per inch while sprayed foam insulation can go as high as 8 0 per inch.
It can cost anywhere from 1 700 to 2 100 or between 1 50 and 3 50 per foot to insulate an attic depending on what insulation material you choose. The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. Spray foam while the most expensive is best for noise reduction and new construction. Most of ga al ar sc ok etc to a high of 49 for zones 6 8 i e.
Blown in insulation is the least expensive option and ideal for older attics. When combined with whatever insulation might already be in the joist cavities a 12 inch additional blanket will very likely meet the energystar recommendations for even very cold climates. The main factors that impact the cost are. Insulation level are specified by r value.
The higher the r value the better the thermal performance of the insulation. Wy mt nh me wi etc. The zone you live in will determine how much insulation you need in your attic. Contractor or insulation installer s fee.
In an attic a 12 inch fiberglass blanket can provide an extra r value of 34 8 to 45 6. This range varies from a low of 30 for homes with heat pumps or natural gas furnaces in zone 3 i e. Square footage of your attic. 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.
Type and material of your insulation. If your insulation doesn t measure up and you need more installation can be done as a weekend diy project or you can call a professional installer to handle the job. Click the button to calculate the depth in inches and pounds of total insulation required for this job.
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