best roof insulation

How the Best Roof Insulation Makes Your Home More Energy Efficient

There are many ways to make your home energy-efficient. You can start with simple steps such as replacing old appliances or switching to LED bulbs. Or you can implement an energy-efficient home design if you’re still in the initial stages of building your home. Make sure to install the Best Roof Insulation for years of energy saving.

Now whether you’ve been a homeowner for years or are just beginning construction of your dream home, you have to pay special attention to your roof insulation if you’re concerned with your home’s energy and cost savings.

The best roof insulation can save you up to 40% in heating and cooling bills. Plus, it can also reduce mold and dampness which is a must for maintaining a healthy and safe home.

Let’s take a closer look at how the best roof insulation helps conserve energy.

The Science of Insulation

You know from science classes that metals conduct heat, while wood and other insulating materials are poor conductors. You also know that when a hot surface comes in contact with cooler air, the latter becomes warmer and rises upwards. Eventually, all heat is removed from the hot surface and conducted to the air.

Now, an insulating material reduces heat exchange through a surface. This could be a roof, a wall, or an attic duct. If a home is well-insulated, the house is able to retain heat during the winter and keep cool during the summer.

On the other hand, using the wrong kind of insulation will increase your energy consumption. You’ll be spending more on heating and cooling systems to keep your house comfy (i.e. warm in the winter and cold in the summer). You’ll also be increasing your greenhouse gas emissions when you choose sub-par insulation.

Why Insulate Your Roof

In a previous post, we mentioned how proper roof insulation offers year-round benefits. The most obvious benefit, of course, is that it prevents energy loss so you’ll have a comfy house whatever the season.

Other benefits include prolonging the life of your roof and keeping the structural integrity of your house. In the winter, roofs that aren’t properly insulated are susceptible to ice dams that weigh heavily on roof structures. Condensation could also collect on the interior of the sheathing, which in the summer can lead to wood rot and mould growth.

If you’re not sure if your current roof insulation is doing its job, your best bet is to consult an insulation expert. But keep in mind that it doesn’t always take an expert to see if you don’t have the best roof insulation installed. If you’ve got high utility bills, drafty rooms, or especially hot or cold ceilings, you need to upgrade your roof insulation.

Best Roof Insulation Options

Because roof insulation is compulsory in all new homes in South Africa, you need to understand your roof insulation options. As insulation experts, we recommend two insulation products: Isotherm and Aerolite.

  • Isotherm is insulation made from PET plastic bottles. It’s a versatile product, which makes it great as insulation for roofs and inside walls. Aside from being versatile, it’s an eco-friendly option. Even very young children can play with this insulation product. It also has a long lifespan and is valued for being dust-free and allergy-free since it has no loose fibres
  • Aerolite, on the other hand, is a fibreglass insulation product produced from recycled glass bottles. One advantage to using Aerolite is it’s noncombustible, meaning it won’t easily catch fire. It also has soundproofing properties and is bio-soluble.

Energy and Cost Savings

If you choose to have either Isotherm or Aerolite installed as your roof insulation, you’ll be glad to know that these products practically pay for themselves.

In terms of energy savings, you can recoup the cost of Isotherm installation within 2 to 3 years. You’ll also save on maintenance fees since Isotherm doesn’t degrade and is resistant to damp and condensation. Also, unlike other insulation materials, Isotherm dries out naturally when exposed to liquids and is free from chemical additives.

As for Aerolite, you can expect to recover the cost of installation in less than 2 years. It also doesn’t require any complicated installation process. Even in the hardest to reach corners of the roof, Aerolite is very easy to install.

Roof Insulation Specifications

As we’ve said before, the SANS legislation on roof insulation is very specific. All new homes built after January 2013 must have insulation with a corresponding R-value for the particular area you live in.

For Aerolite, you can check specifications here. We recommend the Aerolite 135 mm roof insulation if you have a home in Johannesburg, Pretoria, or the Western Cape region. It is SANS compliant, meaning it meets the recommended R-value, which is 3.70.

As for Isotherm specifications, you can view them here. Isotherm is ISO 9001 certified and is recognized by the South African Bureau of Standards (SABS).


There are many ways to create an energy-efficient home. Your options range from the very simple (e.g. switching to LED bulbs or replacing old appliances) to a more complicated process (i.e. designing a new home or remodelling an existing one to be more energy-efficient.)

Whatever approach you take, don’t forget to pay special attention to your roof insulation. When you choose the best roof insulation, you’ll reap numerous benefits such as having a comfortable house year-round and saving money on utility bills.

As insulation experts in South Africa, we recommend Isotherm and Aerolite as your best options. Both offer considerable cost and energy savings and they’re also great for the environment. Make sure you read up on roof specifications so you can get the right one for your home.

Need Roof Insulation Help?

Don’t hesitate to get in touch with us. You can easily reach us at the following numbers:

  • 021-837-1824
  • 021-553-0650
  • Cell: 074-289-3007

If you need more information on Aerolite and Isotherm, we recommend you browse this quick guide. You can also check our blog to know more about roof insulation and home energy saving tips.

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