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Floor Insulation Illustration Knauf

Why floor insulation matters

  1. Energy efficiency: Floor insulation helps to reduce heat loss. This leads to lower heating bills and a more sustainable home. 
  2. Comfort: Insulating the floor helps to prevent drafts and cold spots in buildings, improving the comfort for the occupants  
  3. Moisture control: Insulation helps to prevent moisture from entering your home from the ground, which helps to prevent mold growth and other moisture-related problems. 
  4. Soundproofing: Insulation also helps to reduce noise transmission between floors, which can be particularly important in multi-story homes or apartments. 
  5. Increased home value for the home owner: Insulating your home can increase its value, as it can make the home more energy-efficient and comfortable. 
  6. Overall, floor insulation is an important component of a well-insulated home, and can have a significant impact on energy efficiency, comfort, and overall value. 

Ground floor thermal insulation 

Ground-bearing floors are the interface between a building and the temperature of the foundation material on which it sits, usually concrete. If the insulation is installed below the slab, it increases the thermal capacity of the building, helping to maintain steady internal temperatures. This option is available for new builds. Installing the insulation above the slab, either in a new build or renovation, generally makes the building more responsive to the heating system. 


Acoustic insulation for floors 

Insulation in floors plays a crucial role in preventing noise travelling between rooms. Uninsulated, the floor becomes a hollow drum sounding into the room below. While footsteps and other clattering may be muted by carpet, an ongoing trend for hard floors such as wood and vinyl has amplified the need for acoustic insulation. It’s a solution that promotes privacy and peace within households, and particularly in older apartment blocks where noise can transmit between properties. 

Find out more about the insulation solutions Knauf has to offer for

Concrete floor Wood floor Loft floor


Concrete Floor Insulation Knauf

Concrete floor insulation

Load-bearing floors can include insulation under or over the concrete slab, depending on the designer's choice. 

Under the concrete slab 

If the insulation is installed below the slab, it increases the thermal capacity of the building, helping to maintain stable internal temperatures. If the insulation is installed above the slab, the building will react faster to the heating system. 

Over the concrete slab (floating/wet screed) 

Floating floors (screeds) are the most common floor structures in apartment and office construction. To improve sound insulation from footsteps, the substrate is placed on top of a soft floating layer. 

For proper design of the floating system, the acoustic separation of the subfloor from the surrounding walls and building elements is very important so perimeter insulation strips of mineral wool are also recommended

Over the concrete slab (dry flooring) 

If there is an unheated floor to be insulated, like in a basement, an additional thermal insulation layer is added in addition to the acoustic insulation. This protects against heat loss and reduces coldness in the surface of the floor. 

Exposed soffit floors

Insulation designers have a choice of placement for exposed upper floors. For concrete floors, insulating from above allows for rapid heating, while insulating from below means the floor can be insulated and finished in a single process. For wooden framed soffits, insulation is friction-fitted between timber joists using the entire depth of the joist as an insulation zone. These solutions provide high levels of thermal and acoustic insulation, as well as fire protection. 

Separating Wood Floor Insulation Knauf
Separating floor
Internal Wood Floor Insulation Knauf
Internal floor
Ground Wood Floor Insulation Knauf
Ground floor

Wood floor insulation

Mineral Wool insulation solutions for wood flooring offer thermal and acoustic performance without building up mass.  

Installed between timbers beneath the floor, Mineral Wool insulation dramatically reduces noise from foot traffic and other sources while keeping heat in the room below and helping to balance heat throughout a building. 

Using Mineral Wool to Insulate beneath Wooden Floors 

Rock Mineral Wool or Glass Mineral Wool can be used to insulate beneath wooden floors. The primary concern of the insulation designer should be to ensure the floor has the capacity to support the dead and live loads it must bear in the context of the overall building structure. For that reason, suspended floors are usually insulated with products that are low in mass but effective at thermal and acoustic insulation. 

Separating floors

Keeping heat at the level it is intended is both good for energy efficiency and managing building heat generally. As much as 16% of heat can be lost via a poorly insulated floor. The insulation layer also provides much needed acoustic insulation, in many cases an equally important factor in applying a solution

Internal floors

Installed within the flooring structure and can be used to reduce sound transfer between floors, reduce heat loss and help to warm up a space quickly. This type of insulation is beneficial in areas where there is a high level of traffic or noise. 

Ground floors 

In a suspended wood floor over the ground, the insulation is placed between the joists and supported by netting (polypropylene or similar) or wooden battens. 

Loft Floor Insulation Glass Wool Knauf Insulation

Loft floor insulation 

More and more lofts are being converted in useful spaces. Floor insulation is an important element to get most use out of your loft space. There are different solutions which can be used:

  • Rock Mineral Wool
  • Glass Mineral Wool
  • Blowing Wool

No height restrictions: Mineral Wool slabs

If there are no restrictions to height, you can use Mineral Wool slabs or rolls. These can be layered to increase efficiency, building up from between the ceiling joists to subsequent layers at a 90-degree angle to avoid thermal bridging via gaps. 

Limited height: blown wool

SUPAFIL® Blowing Wool can be installed quickly and is ideal for uninhabitable spaces and cavities with limited space. Blowing wool creates an effective layer of uniform insulation that reaches into tight corners and crevices. Requiring relatively little manpower, it can be installed fast and fuss free without disturbing the occupants of the building. 


Good reasons to insulate your floors

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