Note from this chart that the ideal r value differs for each part of your home.
Attic insulation r value chart canada.
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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.
Where you live different climates require different insulation r values.
Click the button to calculate the depth in inches and pounds of total insulation required for this job.
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.
Input length width and desired r value of the area to be insulated.
The higher the r value the better the thermal performance of the insulation.
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.
Professional installers and diyers also can use blown in fiberglass insulation in an attic to achieve nearly any r value.
You will need a higher r value of insulation if you live in the northeast than if you live in southern.
Fiberglass insulation for most projects comes in batts and rolls with r values ranging from r 8 to r 49.
R value is a measure of insulation s ability to resist heat traveling through it.
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 amount of insulation recommended for your home will vary depending on a number of factors.
How much insulation should you install.
As a benchmark one inch of solid wood has an r value of 1.
In such cases where r value is assigned this may decrease the r value requirement for batt insulation.
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.
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.
Insulation level are specified by r value.
This calculator is to be used as an estimating tool only.
In general to optimally isolate an attic on average an r value of the insulation is required ranging from r 50 to r 60.
Recommended home insulation r values.
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