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