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.
Minimum r value for roof insulation ontario.
You should of course see the manufacturer provided technical data sheet for the r value of specific products.
The updated lttr test methods will result in lower lttr values than previously published.
R value measures how well certain building insulation materials can resist heat.
Add insulation to attic.
Insulation r value is proportional to the insulating material being used.
Existing 3 4 inches of insulation.
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.
Recommended insulation levels for retrofitting existing wood framed buildings.
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.
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 revised lttr values are as follows.
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.
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.
Minimum insulation r value requirements non residential above roof deck.
When determining how much insulation you need don t guesstimate calculate.
See the department of energy s doe ranges for recommended levels of insulation below.
It means that different products require different densities to deliver the same r value.
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.
Here s a handy r value table that covers most types of roof coverings building insulation and a few other materials.
For a very good introductory overview article on r value see r values over at the website of.
Know exactly how much you need with our project calculators.
The ontario building code requirements for insulation is only one of many sections within the act that helps protect you and other people.
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.
