Is Underfloor Insulation Necessary?

When it comes to insulating a home, most people focus on their roof and external walls because these areas are responsible for the greatest heat loss and gain. But what about the floor? You might be wondering if underfloor insulation is a worthwhile investment at all. While it is not as crucial as the roof or walls, underfloor insulation can actually make a significant difference to temperature regulation inside your home. High Performance Spray Systems can give you closer look at why.

Is underfloor insulation worthwhile?

Although it is often overlooked, the floor is actually responsible for 10-20% of a home’s heat loss and gain. That means underfloor insulation can make a tangible difference in keeping your home warmer in winter and cooler in summer. If it is within your budget, underfloor insulation is a worthwhile investment when you also insulate the other areas of your home.

The benefits of underfloor insulation include: 

Better temperature regulation

The role of insulation is to slow down the flow of heat from hotter spaces to cooler spaces. That means keeping the hot air out of your home in summer and trapping it inside on cold days. Installing underfloor insulation will make a significant difference in keeping your home at a more pleasant temperature all year round.

Eliminates drafts

Drafts can enter a home through the space between the floor and the ground. Underfloor insulation is an effective way to prevent this from happening by creating a barrier. This is especially effective in older style homes that are raised above the ground. 

Reduces moisture

Wooden floors are susceptible to moisture damage. Underfloor insulation provides a physical barrier which helps prevent moisture from reaching the floor.

Saves energy

With more efficient thermal regulation thanks to underfloor insulation, you won’t need to rely on artificial heating and cooling as much. What’s more, when you turn the air conditioner on, it won’t have to work as hard to keep your home cool and comfortable. All of this is not only better for the environment, but it will lead to savings on your power bill – as much as 10%!

Less noise

If you invest in specialised acoustic underfloor insulation, you won’t only experience the thermal benefits listed above, but your home will be quieter. The noises from footsteps and noisy appliances can be absorbed by acoustic underfloor insulation for a more peaceful indoor environment.

Types of underfloor insulation


Some of the most common and effective types of underfloor insulation are: 

Polyester Rolls

These are soft to touch and pleasant to work with for those doing a DIY installation. They are installed between floor joists and stapled into place with no gaps.

Glasswool Insulation Batts

These are cut smaller than rolls, which makes them easy to handle in tight spaces. They can be installed between the floor joists and strapped in place with no gaps.

Extruded Polystyrene (XPS)

These are very dense products which provide an effective insulation barrier in the floor of a building. They are appropriate for new and existing homes and can be installed between floor joists or laid before the concrete foundation is poured.