Installing floor insulation can improve energy efficiency – and reduce unwanted noise levels from spaces above by up to eight times.1

Our range contains dual and mono density stone wool products, resulting in an impressive thermal performance that prevents heat escaping through floor and ceiling spaces.

Discover how ROCKWOOL insulation for floors can be applied to several floor applications, from intermediate and floating floors, to suspended ground floors. Additional solutions can also be found under our ceiling insulation pages.




Why do we need floor insulation?

Floors in buildings are magnets for sound and heat to travel through. This can cause long-term issues for tenants and owners, such as nuisance noise, high energy bills and colder living conditions.

These problems are becoming ever more common. By 2050, it is expected that more than 50% of the world’s population will be living in cities – a prime location for noise disturbance.2

Different floor types also need unique insulation solutions to help increase their energy efficiency. These include:

  • Exposed Floors – floor suspended above a crawlspace, requiring optimum thermal property insulation because of high heat-loss risk.3
  • Under Slab – ground floor or basement floor in direct contact with the ground, susceptible to losing heat, requiring robust insulation to improve thermal performance.
  • Intermediate (separating) floors floor in between levels where insulation needs to be adaptable to fit in-between floor-joists.4

Correctly insulating floors below, in-between, or on top of, wooden, metal or concrete constructions can help to overcome these obstacles.

Optimum insulation can help to:

  • Block out unwanted noise
  • Reduce heat lost through floors
  • Improve a building’s energy efficiency

Premium ROCKWOOL stone wool floor insulation does this over the lifespan of a building – without deteriorating in performance.

For wooden floors meanwhile, the non-combustible properties of our stone wool product range help to increase fire safety levels.5

Calculator and savings

To work out how much insulation you will need, measure the length and width of your floor space to calculate the area’s m² value. You may want to order slightly more to allow for some excess.

When fitting in-between joists, make sure you select the proper width as this might affect the amount of product you want to purchase.

Work out how resistant your floors are to the flow of noise with our local available Acoustic Calculators and reports.

Calculate the thermal performance of ROCKWOOL floor insulation using a local R-Value Calculator or consult our technical team.

impact sound, footfall sound, footfall sound insulation, floor insulation, floorrock, installation, installation video, thumb, thumbnail, trittschall, trittschalldämmung, verarbeitung, verlegung, verarbeitungsvideo, germany
Our floor applications range from thermal products that reduce energy bills, to acoustic products that substantially reduce sound going through a floor. All are designed to help you stay comfortable and safe.

Roger Peeters

Global Product Manager, ROCKWOOL Group

Case studies

The challenge

Property developer Keywest 3 converted an empty high-rise office complex into 43 luxury flats in South Shields, UK.

This ambitious renovation project aimed to minimise noise travelling between apartments, and to improve the building’s wall and underfloor insulation. Originally, the company planned to use 50mm glass wool insulation.

However, the team at Keywest 3 changed their mind after an on-site demonstration of ROCKWOOL floor solutions, which showcased superior acoustic properties and met all of their criteria.

The solution

Keywest 3 picked ROCKWOOL FLEXI® 50mm for this project, deciding to double the material to bolster the sound insulation of the development.

The result

  • Building regulation requirements for soundproofing were surpassed
  • Resident comfort and fire safety were enhanced
  • Thermal efficiency was improved – resulting in reduced tenant energy bills
The Word,United Kingdom,South Shields,1.100m²,Steve Dickson,Senior Director at Faulkner Browns Architects,Daniel Reilly at Reilly Ceiling and Drywall,Ben Clarkson,Group Photographer for Bowmer and Kirkland,ROCKFON® Mono® Acoustic
Not only will ROCKWOOL sound insulation deliver outstanding acoustic benefits to stop noise transfer in its tracks, it will also reassure residents that their homes are thermally efficient and fire-safe.

Norman Fada

Project Director at Keywest 3
Once installed, ROCKWOOL products can achieve optimal performance. They meet, as well as go above and beyond, building requirements.

Roger Peeters

Global Product Manager, ROCKWOOL Group

Sustainability and energy efficiency

We aim to create sustainable, natural and cost-effective insulation solutions that enrich the lives of people using them.

ROCKWOOL floor insulation products are created in an innovative way. Using raw and upcycled materials11, we have developed an energy-efficient range that has minimal impact on the environment during production.

Product illustration, basement, sound, floor, insulation


What is the best insulation for floors?
What do you use to insulate a concrete floor?
Should you put foiling over insulation?

Looking for answers? Let us help!