What Wall Insulation Works Best for Older New Zealand Homes

Many older homes across New Zealand were built before wall insulation became a standard part of construction. While ceiling and underfloor insulation have been common upgrades, walls are often left untouched. This creates a big gap in your home’s thermal barrier and can lead to a large amount of heat being lost through uninsulated walls. If you’re wondering what wall insulation works best for older homes, the answer lies in solutions that can be installed without major renovation, like CosyWall.

Why Wall Insulation Matters 

Walls make up a large surface area in your home. Research shows up to 25 percent of a home’s heat can be lost through the walls if they are not insulated. That makes walls one of the largest areas of heat loss in any home. Heat naturally moves from warm spaces to cold ones. Without insulation in the walls, warmth from inside the house quickly transfers to the colder outside air.

This makes it harder to keep your home warm, even if the ceiling and floor are well insulated. It also puts extra pressure on heaters and heat pumps to keep the home warm, which leads to higher energy use and rising power bills. By insulating your walls, you can slow down this heat transfer and help keep your home at a steady temperature.

How CosyWall Insulation Works 

CosyWall insulation is a type of blown wall insulation that can be installed from either the inside or outside of your home. Because the material is blown in, it fills every corner of the wall cavity. This creates a continuous layer of insulation that blocks heat loss and helps keep out cold air. Unlike traditional insulation batt-type products, which require full access to the wall cavity, blown insulation can be installed quickly and efficiently with minimal disruption to your home.

Inside installation:

Small holes are drilled into the internal walls, usually about the size of a 10-cent coin. The insulation is blown in through these holes. Once finished, the holes are patched and repainted.

Outside installation:

If you prefer not to disturb the interior, CosyWall can be installed from the outside. Holes are drilled into the cladding, the insulation is blown in, and the holes are sealed and matched to your home’s exterior.

Both methods are fast and effective, with minimal disruption to your home.

Why CosyWall Blown Insulation Works Best 

Quick installation 

Most homes can be insulated in just one day. There’s no need for full-scale renovations or removing wall linings.

Complete coverage 

The blown insulation fills every part of the cavity, including hard-to-reach spots around pipes and wiring. This provides better performance than traditional insulation products that may leave gaps.

Better energy efficiency 

With proper wall insulation, your home stays warmer in winter and cooler in summer. This means less energy use and lower power bills.

Improved comfort and soundproofing 

CosyWall insulation has great acoustic properties, helping reduce noise from outside and between rooms, making your home more peaceful and private.

Is Your Home Missing Wall Insulation? 

If your home feels cold in winter or heats up quickly in summer, uninsulated walls might be the reason. Wall insulation is one of the best upgrades you can make to improve comfort, lower energy use, and add value to your home.

If you’re asking what wall insulation works best, CosyWall is a proven solution for older homes across New Zealand. It’s fast to install, causes minimal disruption, and delivers long-term benefits.

Get in touch with us today for an obligation-free quote and find out how CosyWall can help you make your home warmer, drier, and more energy-efficient.