How Much Is Enough Attic Insulation

Add the right kind of insulation.

How much is enough attic insulation.

Estimates suggest that it ll cost around 1 340. For example if you install r 19 fiberglass batts in 2x6 frame walls with the studs 16 inches on center double top plates and other elements of standard framing the actual r value of the whole wall with the r 19 insulation will be about r 15. The higher the r value the better the thermal performance of the insulation. Having enough insulation in your attic is one of the best ways to save energy on both heating and cooling your home.

The recommended level for most attics is to insulate to r 38 or about 10 to 14 inches depending on insulation type. Insulation levels are specified by r value. To find out if you have enough insulation in your attic measure the thickness of the insulation from top to bottom using a ruler. Blown in insulation is the least expensive option and ideal for older attics.

Check the chart below as a down and dirty guide of your existing r value. How much should i add. R value is a measure of insulation s ability to resist heat flow. If your attic insulation covers your joists and is distributed evenly you probably have enough.

Energy information administration predicts that this. First off you should know that insulating your attic isn t cheap. 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. How well a particular insulation works is expressed by the r value which ranges from 2 0 to 8 0 per inch of insulation.

Use our roll insulation calculator to estimate the amount of wall insulation crawlspace insulation or attic insulation you need for your project. Spray foam while the most expensive is best for noise reduction and new construction. These recommendations are for true r values not the nominal values listed on insulation packaging. The higher the r value the better job the insulation does at preventing the transfer of heat.