The thermal effectiveness of insulation is measured by its thermal resistance or r value.
Ceiling insulation r value nz.
Why is a higher r value better.
Warm up new zealand.
For example if you have a type of insulation that has an r value of r 5 per inch of thickness you will need a depth of 6 inches of this insulation installed your attic to reach r 30 if you live in zones 2 or 3.
Know exactly how much you need with our project calculators.
Building code requirements for house insulation previous r values for common construction types next.
If there s more than one layer of insulation their product r values may be combined.
Insulation requirements www tenancy govt nz 0800 tenancy 0800 836 262.
Tiny air particles trapped in insulation resist the transfer of heat and cold.
The branz house insulation guide provides construction r values for common construction types.
Availability is through regional projects.
Pitched timber framed roof r 3 3.
Minimum r values for zones 1 and 2.
In an uninsulated house more heat is lost through the ceiling and roof than any other part of the house making the roof the top priority for insulation.
The r value is a measure of the insulation s effectiveness the higher the r value the better the insulation will perform.
Insulation that doesn t meet the regulations must be topped up or replaced.
The new zealand building code specifies minimum r values for ceiling insulation in different regions reflecting the climate.
For heated walls or ceilings higher r values are required walls r 2 6 ceilings r 3 5.
These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation.
Minimum r values for zone 3.
All insulation must be in reasonable condition.
This means for example that pink batts ultra r4 0 insulation is more effective than pink batts classic r1 8.
The building code outlines minimum r values which depend on what part.
The r value of carpets or floor coverings must not be included in calculation of floor r value for heated floors.
You need to install an insulation product with an r value between 2 2 and 2 8.
When determining how much insulation you need don t guesstimate calculate.
Rest of the north island.
R value measures how well certain building insulation materials can resist heat.
The higher the r value the greater the insulation performance.
You can find some of the examples here.
