Attic Insulation Requirements

Now that you ve air sealed your attic and basement check your attic insulation levels and add more if necessary.

Attic insulation requirements.

Use unfaced insulation when adding more insulation to an attic that already has some insulation laying the rolls or batts at right angles to the floor joists. R value is a measure of insulation s ability to resist heat traveling through it. Insulate your attic to the recommended level including the attic door or hatch cover. Continuous insulation and attic insulation.

The attic is the easiest place to add insulation to improve your comfort and the energy efficiency of your home. The 2015 irc requires r 49 insulation for ceilings with attic spaces. Achieving greater r values in attics the higher the r value the better the thermal performance of the insulation. 2 insulation priorities it is most important to.

Type and material of your insulation. Find your zone on the map and then use the chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces. Insulation level are specified by r value. 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.

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. While federal and in some cases state guidelines for insulation levels are merely recommendations the local building code is the true authority over insulation requirements. The table below shows what levels of insulation are cost effective for different climates and locations in the home. Pa302 1 ceilings with attic spaces n1102 2 1 r402 2 1.

Inspecting your attic insulation. The main factors that impact the cost are. According to home advisor insulating your attic can cost between 1700 to 2100. The higher the r value the better the thermal performance of the insulation.

According to the u s. Square footage of your attic. Department of energy it s recommended that attics have an r 38 to r 49 or about 12 to 15 of fiberglass or cellulose insulation. Contractor or insulation installer s fee.

The rules and code updates occur every few years so that the ontario building code is updated by also integrating new discoveries and technology in the field of construction and insulation. With precision there has been a change in the insulation requirements.