Internal Wall

Internal wall insulation can be used in both commercial and residential properties to improve indoor comfort and boost energy efficiency.1

There are various methods of adding insulation for inside walls – each designed to reduce thermal transmission, increase acoustic performance or raise fire safety.

Read on to discover more about ROCKWOOL internal wall applications – and the benefits and cost savings they can bring.

Why do we need internal wall insulation?

Introducing high quality interior wall insulation is one of the best ways to prevent loss of circulated cool air, protect against fire risks, and improve acoustic capabilities.

It improves energy performance and creates a comfortable home or working environment suitable for all types of internal walls:

  • Partition walls – Non-load bearing walls used to divide a room. Commonly a wooden or metal stud wall with plasterboard finish or similar.
  • Dry lining walls – Similar in build to a partition wall, but placed on the inside of the outer wall. This type of internal wall is designed around improving comfort.
  • Separation walls Also known as a party wall, these separate adjoining flats, houses and rooms between residential properties.

Applications can be easier and more accessible for certain properties, such as flats. They also have no impact on the external appearance, such as with dry lining walls where the insulation can be installed before the cladding, which is then painted over.

For separation and partition walls, they improve the soundproof qualities between rooms and properties.

Benefits of ROCKWOOL internal wall insulation include:

  • Reduced heat gained
  • Protection against fire risks
  • Cost-effective installation
  • Blocking and absorbing sound
  • Matching environment aesthetics

Calculator and savings

The amount required, and the precise cost to install, will depend on the size of your property, the thickness of its walls, and how many are being insulated.

With dry lining often done to increase the living comfort the insulation thickness is mostly limited to 50-100mm. Naturally, you can always use a local U-value calculator in case you want to further increase the thermal performance of the wall.

Insulating the separation wall between dwellings will save on the energy bill as it will prevent heat transfer from one to the other.

To save time when determining the acoustic and fire performance, we have relevant reports available at local subsidiaries, meeting country-specific requirements, and building traditions.

Use our ROCKWOOL U-value calculator to determine the thermal performance of the building’s walls and possible cost savings. For more details on technical specifications, visit our ROCKSPEC Specification Toolkit.

Partition walls, internal insulation
We provide a range of dedicated products for various internal wall applications, meeting the specific needs and requirements of that application. These include thermal products to reduce energy bills, acoustic products to substantially reduce sound going through the wall, and firesafe products to achieve the highest fire resistance.

Roger Peeters

ROCKWOOL Group Product Manager

Case Studies

The challenge

Property developer Keywest 3 transformed an office complex into 43 modern apartments and duplexes overlooking the River Tyne in South Shields, UK.

The developer wanted to minimise any sound transfer between the Manhattan-style properties that could disturb residents.

The solution

After initially selecting 50mm glass wool insulation for internal walls, the company switched to ROCKWOOL stone wool insulation for its improved acoustic performance.

The ROCKWOOL Sound Insulation Slab was chosen after a site visit and sound box demonstration. The solution exceeded current building regulations – providing a protective sound and fire-safe cocoon for each apartment.

The results

The developer decided to install 100mm of insulation per wall leaf, doubling the 50mm that met its standards. This resulted in apartments with exceptional thermal, sound and fire credentials.

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, Keywest 3

Sustainability and energy efficiency

ROCKWOOL internal wall insulation is focused on sustainability and enhancing the energy efficiency of buildings.

Our products are made from one of the most abundant natural resources on our planet – rock – with the earth producing 38,000 times more stone than we use annually to create stone wool.3

foam, spraying, insulation, construction, internal walls

Financial support

Grants, sustainability schemes and refunds may be available through tax reductions or incentive schemes for properties meeting specific criteria. Contact our local offices for more information.

Energy Efficiency, Key, Keyboard, Button


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How do you soundproof an interior wall?
How do you treat condensation on internal walls?