The higher the r value the better the thermal performance of the insulation.
Exterior wall insulation r value chart canada.
Find your zone on the map and then use the above insulation r value chart to determine the level of insulation you need to properly insulate your attic walls floors and crawlspaces.
As a fast option to increase the wall rsi value while reducing thermal bridging install at least rsi 0 88 to 1 76 r 5 to 10 rigid board insulation directly to the wall finish and cover it with drywall.
Try the r value calculator available through oak ridge.
Read down the column of nominal thermal resistance to find your cavity insulation nominal value provided in rsi and r value.
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.
Higher r value numbers mean that the insulating material resists the cold or heat from the outside better.
The r refers to absolute thermal resistance.
The table below shows what levels of insulation are cost effective for different climates and.
Also included is the hugely helpful insulation zip code calculator that spells out the suggested amount of r value necessary for the different portions of a structure like foundation interior and exterior walls attic and more.
Additional r value for a masonry wall constructed using these materials needs to add the insulating value of additional wall components typically included such as 1 solid foam polyisocyanurate r 8 extruded polystyrene r 5 expanded polystyrene r 4 or 1 of perlite r 2 7 and for an exterior air film winter no wind r 0 17 an interior.
In such cases where r value is assigned this may decrease the r value requirement for batt insulation.
Recommended home insulation r values.
R value is a standard unit of measurement for determining among many things how effective your insulation will be.
While there are additional considerations such as venting and moisture problems to take into account when you insulate under floors the united states department of energy recommends an r 25 rating in cold climates and an r 11 in warmer parts of the country.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
Insulation level are specified by r value.
Thickness density and type of materials are some factors that contribute to.
For example a wall with 3 fiberglass batting r value of 10 8 11 9 may have an overall r value of nearly 14 because of siding sheathing and drywall.
At the eaves such that at least 80 of the depth of the installed insulation is achieved above the top plate of the exterior walls.
Along with knowing the r value of a particular insulation it is also important to calculate the r value of a total system.
R value is a measure of insulation s ability to resist heat traveling through it.
