Roof R Value Ontario

The ontario building code thickness or rating 9 23 15 7.

Roof r value ontario.

The higher the r value the better the thermal performance of the insulation. Normal ventilation techniques as per code may not be enough to overcome the delta. 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. R value is a measure of insulation s ability to resist heat traveling through it.

2 the thickness or rating of roof sheathing on a roof not used as a walking deck shall conform to either table 9 23 15 7 a. Thickness or rating 1 the thickness or rating of roof sheathing on a flat roof used as a walking deck shall conform to either table 9 23 14 5 a. The increase r21 r3 exactly 18 the value by which you are increasing the r value. See the department of energy s doe ranges.

Repairing a roof is usually the more economical route unless you have an older roof that will need to be replaced in the next few years. This situation can lead to premature degradation of the soffit area top plate roof sheathing and attic as a whole. To calculate the total r value of a roof assembly find the total thickness in inches of each type of insulating material within the system. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number.

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. B maximum overall thermal transmittance u value for the entire assembly required in table 12 3 4 2 where u value is provided. Insulation level are specified by r value. Total r value for the above roof system is 14 54.

Recommended home insulation r values. Installed r value for complying with the ontario building code centre of cavity r value for complying with the quebec construction code. The cost of a roof replacement depends largely on the surface area of your roof and the types of materials that you may want to use. What r value do i need.

R3 r18 r21 total roof r value. An r 60 attic increase will exacerbate the problem even further. Calculate percent improvement in r value. 3 where the top of a foundation wall is less than 1 200 mm above the adjoining ground level those portions of the.