Existing 3 4 inches of insulation.
Minimum r value for roof insulation ontario.
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.
The higher the r value the greater the insulation performance.
R value of various materials.
Know exactly how much you need with our project calculators.
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.
When determining how much insulation you need don t guesstimate calculate.
Thickness inches new lttr values per inch thickness new lttr values per thickness 1 5 6 5 6.
The recommended r value for attic insulation in ontario is between r 50 and r 60.
Pima has established that polyiso roof insulation will have different minimum r values depending on board thickness.
It means that different products require different densities to deliver the same r value.
R value roofs without attic space insulation above deck u 0 032 r 30 0 ci u 0 028 r 35 0 ci with attic space and other u 0 021 r 50 0 u 0 017 r 60 0 walls above grade above grade walls u 0 055 r 13 0 r 10 0 ci u 0 055 r 13 0 r 10 0 ci wall below grade.
The r value of the insulation for every inch of thickness depends on the type of insulation.
Recommended insulation levels for retrofitting existing wood framed buildings.
For a very good introductory overview article on r value see r values over at the website of.
Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.
R value measures how well certain building insulation materials can resist heat.
Insulation r value is proportional to the insulating material being used.
The ontario building code act is a legal framework set up by the provincial government to establish minimum building standards and it applies to any new builds renovations or change of use construction.
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.
The ontario building code requirements for insulation is only one of many sections within the act that helps protect you and other people.
You should of course see the manufacturer provided technical data sheet for the r value of specific products.
The revised lttr values are as follows.
The updated lttr test methods will result in lower lttr values than previously published.
See the department of energy s doe ranges for recommended levels of insulation below.
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.
