Ceiling Insulation R Value Nz

Why is a higher r value better.

Ceiling insulation r value nz.

Skillion roof r 3 3. Minimum r values for zone 3. The insulation s thickness has not degraded by more than 30 compared to when it was installed. The branz house insulation guide provides construction r values for common construction types.

You need to install an insulation product with an r value between 2 2 and 2 8. The insulation s r value met the minimum r values 2 9 or 3 3 depending on the climate zone when it was installed and. Pitched timber framed roof r 3 3. All insulation must be in reasonable condition.

Building code requirements for house insulation previous r values for common construction types next. Tiny air particles trapped in insulation resist the transfer of heat and cold. These r values are a sum meaning this should be the total r value once you add up the entire depth of insulation. Insulation that doesn t meet the regulations must be topped up or replaced.

If you re using fibreglass ceiling insulation then you will need to go slightly higher. The r value is a measure of the insulation s effectiveness the higher the r value the better the insulation will perform. 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 in your attic to reach r 30 if you live in zones 2 or 3. 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.

If using polyester ceiling insulation to top up then the additional amount of additional r rating calculated will be the actual amount to add. Minimum r values for zones 1 and 2. Eg two layers of r2 3 polyester blanket will give a combined r rating of r 4 6. For heated walls or ceilings higher r values are required walls r 2 6 ceilings r 3 5.

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 higher the r value the better the insulation is at reducing heat flow. Healthy homes projects provide free ceiling and underfloor insulation for low income households occupied by people with health needs related to cold damp housing.

The r value of carpets or floor coverings must not be included in calculation of floor r value for heated floors. Warm up new zealand. Higher r value better insulation. Insulation must be installed in accordance with new zealand standard 4246 2016 external link.

Availability is through regional projects.