Minimum insulation r value requirements non residential above roof deck.
Minimum r value for roof insulation ontario.
The r value of the insulation for every inch of thickness depends on the type of insulation.
Thickness inches new lttr values per inch thickness new lttr values per thickness 1 5 6 5 6.
Pima has established that polyiso roof insulation will have different minimum r values depending on board thickness.
The revised lttr values are as follows.
For a very good introductory overview article on r value see r values over at the website of.
You should of course see the manufacturer provided technical data sheet for the r value of specific products.
The ontario building code requirements for insulation is only one of many sections within the act that helps protect you and other people.
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 recommended r value for attic insulation in ontario is between r 50 and r 60.
It means that different products require different densities to deliver the same r value.
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.
Know exactly how much you need with our project calculators.
R value measures how well certain building insulation materials can resist heat.
When determining how much insulation you need don t guesstimate calculate.
Insulation r value is proportional to the insulating material being used.
A bare concrete wall basement foundation rates at an insulation r value of about r 1 newly insulated attic rates at an insulation r value of r 40 or more.
Recommended insulation levels for retrofitting existing wood framed buildings.
See the department of energy s doe ranges for recommended levels of insulation below.
The updated lttr test methods will result in lower lttr values than previously published.
Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.
State applicable energy ashrae zone minimum r value state local ms mississippi ashrae 90 1 2010 2 r 20 3 r 20 state local mo missouri 2012 iecc 4 r 25 5 r 25 state only mt montana 2012 iecc 6 r 30.
R value of various materials.
R values of common types of insulation the two distinct types of attic insulation are loose fill material also commonly known as blown in insulation and batting.
Existing 3 4 inches of insulation.
Add insulation to attic.
