Home Improvement

Underfloor Insulation: Choosing What Should You Use

Many people overlook underfloor insulation, but did you know that without it, your house might gain up to 20% of its heat? Putting underfloor insulation in new or existing structures is a wise investment with several long-term advantages. Underfloor insulation would not only make your house warmer in the winter and cooler in the summer, but it may also save you money on your power bill. This is because well-insulated dwellings need less artificial heating and cooling in order to keep you comfortable in your home..

How Is Underfloor Insulation Installed?

Thermal energy naturally moves from places with high thermal energy to states with low thermal energy until the temperature is uniform. During the summer, it becomes a problem when the hot air starts to seep into our dwellings.

Moreover, the lovely warm indoor air may swiftly escape via cracks in the ground, walls, and ceiling in the winter, leaving us shivering. Underfloor insulation, like insulation in other sections of the house, serves to prevent heat from escaping so that you can maintain a comfortable temperature within. Furthermore, there are various forms of underfloor insulation, each of which works somewhat differently to avoid heat loss or gain.

What Is the Best Underfloor Insulation?

The best underfloor insulation would be determined by various criteria unique to your scenario. For example, were you retrofitting an existing home or creating a new one? Where do you reside, and what type of weather do you want? Are you handling the installation alone, or will you pay someone to do it for you? Several of the most common underfloor insulation products are as follows: 

Rolls of Polyester

Bulk insulation is made out of polyester rolls like GreenStuf Underfloor Insulation. Bulk insulation slows the passage of heat by trapping billions of microscopic air pockets in its structure.

The effectiveness of bulk insulation will be reduced if it is crushed upon installation. Polyester rolls are pre-cut to suit existing wood joists floors and are created from recyclable plastic components. Moreover, it is soft to the touch and does not include any breathable fibers. 

Glasswool Batts for Underfloor Insulation

Glasswool batts, such as earthwool Underfloor Insulation Batts, are a form of bulk insulation that uses billions of tiny air pockets to block heat transfer. Glasswool products, created from recycled glass, are a cost-effective solution.

Insulation batts are pre-cut to suit here between joists on wooden floors and may be clamped or glued in place. They’re lightweight, and earthwool, for example, is comfortable to touch and doesn’t have the itching associated with glass wool. By minimizing resonance throughout the property, acoustic alternatives may give substantial acoustic benefits.

Boards Made Of Extruded Polystyrene

The thick closed-cell structure of XPS foam board insulation offers exceptional thermal performance. It may be utilized in several ways around the house, but it’s perfect for under slab insulation in concrete floors. 

Moreover, because XPS has high compressive strength and is resistant to water, it may assist reduce heat loss via the ground. For increased heat resistance, it may even be utilized in numerous layers. 

Insulation Foilboard

Foilboard is a rigid insulating board suitably used in walls, roofs, and underfloors. They have a fire-resistant expanded polystyrene core with pure aluminum foil covering both sides. Enhanced thermal performance and water resistance create a thermal break and a vapor barrier. 

Furthermore, foilboard insulation is fast and easy to apply, and it doesn’t have any fibers, so it’s a pleasure to work with. Flooring saddle and joining tape keep panels in place when they are trimmed to fit between the wood joists.

Does Underfloor Insulation Make a Difference?

Yes, correctly installed underfloor insulation in any home minimizes winter energy loss and enhances summer heat gain. Even though the rest of your home is well-insulated, the flooring might let in draughts or heat loss.

Underfloor insulation contributes to a more comfortable interior climate, which means you’ll use your heating and cooling systems less often. That’s how underfloor insulation may save you anywhere from 10% to 20% on your energy bills!

Additionally, by softening the sound of a footfall, underfloor insulation may give acoustic advantages. Like wall and roof insulation, underfloor insulation helps limit noise transmission from outside to inside your house and vice versa.

Reasons Why It Is Necessary To Have Underfloor Insulation

The following are some of the reasons on why you should consider having underfloor insulation:

It Improves Your Heating And Cooling Efficiency.

To increase the property’s thermal efficiency, batts make it an excellent thermal insulation and vapor wall, unlike conventional bulk insulation and insulation. Its high thermal efficiency makes it the perfect excellent choice.

It Saves You Energy-Costs.

The usage of heaters and air conditioners to promote comfort during the winter cold and summer heat may be costly. The floor must be insulated to avoid cold air or radiant heat draughts from impacting the interior temperature and be comfortable despite the lack of use of heaters and air conditioners.


Underfloor insulation panels may be installed in various methods as they feature new construction and retrofit installation systems. Floor saddles for new construction for retrofitting between the joists are both options for installing these panels.

However, make sure to choose the right R-value for your floor insulation. The R-value of a separate insulating sheet reflects its thermal efficiency. The heat resistance of an insulating panel is proportional to its R-value.

Putting underfloor insulation might be beneficial. By minimizing air draughts between the floorboards and producing an insulating air pocket under the floors, floor insulation will help retain heat in the home and boost the temperature.