In an uninsulated home, approximately 35% of heat is lost through the roof, 22% through the walls, 14% via the floors, and 25% through the windows.

Having proper insulation is therefore vital if you are trying to save energy. Without it you are paying a great deal to heat your home which is quite literally going straight out through the roof.

Likewise, a well-insulated home will also keep you cooler in the hotter summer months.


Sinewave recommends as a first step that you insulate your roof as this is where you lose the most heat and it's usually the most accessible.

Secondly, if possible, we recommend insulating under the ground floor. If there is any dampness under the house, the addition of a polythene ground sheet is highly recommended.

Insulated walls will stop approximately 22% of any heat escaping. However, we only recommend insulating these in a new build or renovation as removing internal walls is a messy, time-consuming and expensive process. Insulated walls will stop approximately 22% of any heat escaping.

If, like most New Zealand houses, you only have single glazing then we don't recommend replacing them with double or triple glazing for the sole purpose of reducing your thermal loss. It simply isn't cost-effective. However if they need replacing we recommend installing double-glazing.


Heat moves from warm to cold areas. How much a material resists this transference or conduction of heat is referred to as its R-Value.

Insulation materials with a high R-Value work better at reducing your home’s heat loss or heat gain, so less energy will be required to heat your house in winter or cool it in summer.

The Building Code states minimum R-Value requirements for insulation as: Roof R2.9, Floor R1.3 and Walls R1.9.

Sine Wave will only install insulation which meets or exceeds these requirements, ensuring your home is warm, insulated and up to Code.




Heat Loss in an Uninsulated Home

SINEWAVE. The science of energy efficiency