How much Insulation do you need?

It all depends on how cold it gets where you live. Here are the recommended minimum insulation levels (R-values) for existing homes:

	North Island (excluding Central Plateau)	South Island and Central Plateau
Ceilings with 0-75mm of existing insulation	R2.8 blanket or R3.4 segment insulation	R3.2 blanket or R4.0 segment insulation
Ceilings with 75-120mm of existing insulation	R1.8 blanket insulation	R2.4 blanket or R2.6 segment insulation
Underfloor	R1.4 bulk insulation	R1.4 bulk insulation
Walls	Check the thickness of your wall cavity and find the highest R-value product at that thickness

New Zealand is divided into three climate zones, ranging from relatively warm to cool and frosty during winter.

All areas north of, and including, Franklin District. Thames-Coromandel is also part of Climate Zone 1.

All North Island areas not covered by Climate Zones 1 and 3.

All of South Island and North Island Central Plateau (Taupo and Ruapehu Districts, and north of Rangitikei District).