Roof Insulation R Value Canada

Polyiso insulation thickness r value chart.

Roof insulation r value canada. R value measures how well certain building insulation materials can resist heat. One method involves installing rigid board insulation on top of the existing roof see figure 5 25. R3 r18 r21 total roof r value. Understanding r value thursday december 13 2018 what does r value mean.

Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials. If the nominal thermal resistance of the cavity insulation being used falls between two specified rsi r values the lower value must be applied i e rounding up is not permitted. The higher the r value the greater the insulation performance. A higher r value means that the insulation will do a better job of holding in conditioned air whether that s heat in the winter or cool air in the summer.

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. Recommended home insulation r values. 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. The increase r21 r3 exactly 18 the value by which you are increasing the r value.

You should of course see the manufacturer provided technical data sheet for the r value of specific products. R value of various materials. 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. In such cases where r value is assigned this may decrease the r value requirement for batt insulation.

R value recommendend is r60 with batt or blown insulation. Know exactly how much you need with our project calculators. When determining how much insulation you need don t guesstimate calculate. The frame cavity component tables indicate eligible surface air films or roof air spaces that may be included in the continuous layers of rsi series determined in.

R value recommendend from r51 to r60 with batt or blown insulation. Calculate percent improvement in r value. R value is a measure of insulation s ability to resist heat traveling through it. The higher the r value the better the thermal performance of the insulation.

R value recommendend from r50 to r60 with batt or blown insulation. I calculate insulation resistance to heat loss or r percentage improvement always as relative to the original number. For a very good introductory overview article on r value see r values over at the website of. The higher rsi value of rigid insulation means a smaller increase in the roof thickness although several layers of insulation may be needed to meet the desired rsi level.

Zone 5 and zone 6.