Attic Insulation R Value Chart Canada

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Attic insulation r value chart canada. In comparison an inch of blown fiberglass insulation has an r value of 3 1 3 4 and an inch of blown cellulose in an attic has an r value of 3 2 3 7. The higher the r value the better the thermal performance of the insulation. In such cases where r value is assigned this may decrease the r value requirement for batt insulation. Insulation level are specified by r value.

As a benchmark one inch of solid wood has an r value of 1. Input length width and desired r value of the area to be insulated. Chart courtesy of energy star. Fiberglass insulation for most projects comes in batts and rolls with r values ranging from r 8 to r 49.

How much insulation should you install. R value is a measure of insulation s ability to resist heat traveling through it. 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. Foam plastic insulation on the interior of the building envelope must adhere to the requirements of protection of foamed plastics as per 9 10 17 10 of the national building code of canada.

For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3. Where you live different climates require different insulation r values. The insulation levels of an attic or of any part of a house are understood through the r value that is the value with which the insulating material is resistant to heat flow. This calculator is to be used as an estimating tool only.

Note from this chart that the ideal r value differs for each part of your home. In general to optimally isolate an attic on average an r value of the insulation is required ranging from r 50 to r 60. Professional installers and diyers also can use blown in fiberglass insulation in an attic to achieve nearly any r value. The amount of insulation recommended for your home will vary depending on a number of factors.

Spray foam pink fiberglas vs. Recommended home insulation r values. Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system. Click the button to calculate the depth in inches and pounds of total insulation required for this job.