Minimum R Value For Roof Insulation Ontario

Insulation r value is proportional to the insulating material being used.

Minimum r value for roof insulation ontario.

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. 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. Pima has established that polyiso roof insulation will have different minimum r values depending on board thickness. The recommended r value for attic insulation in ontario is between r 50 and r 60.

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. For a very good introductory overview article on r value see r values over at the website of. R value measures how well certain building insulation materials can resist heat. Minimum insulation r value requirements non residential above roof deck.

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. Recommended insulation levels for retrofitting existing wood framed buildings. R value of various materials.

The revised lttr values are as follows. Thickness inches new lttr values per inch thickness new lttr values per thickness 1 5 6 5 6. See the department of energy s doe ranges for recommended levels of insulation below. The higher the r value the greater the insulation performance.

Know exactly how much you need with our project calculators. 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 r value of the insulation for every inch of thickness depends on the type of insulation. 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.

The updated lttr test methods will result in lower lttr values than previously published. Existing 3 4 inches of insulation. You should of course see the manufacturer provided technical data sheet for the r value of specific products. Add insulation to attic.

It means that different products require different densities to deliver the same r value.