ROCKWOOL party wall insulation can reduce heat loss in detached properties and flats.

Made from natural stone wool, our products help to regulate temperatures and reduce the impact of noise from neighbouring properties.

Find out how our range can boost the energy efficiency of your project

Why do we need party wall insulation?

Separating party walls are the dividing walls between two attached properties. They are constructed from solid materials, such as bricks and concrete blocks, or built out of a framed wall construction, using wooden studs or metal frames.

There is usually a gap between party walls called an air cavity, which separates the buildings. Cold air can seep into this cavity, through edges that are exposed to the elements outside, while warm air rises and escapes the building.

This heat loss can drive up heating bills and create a less energy efficient home. Noise can also be an issue, as sound can easily travel through this hollow space. The increased amount of cold air flowing into a building can even increase the risk of occupants developing respiratory conditions - or exacerbating existing symptoms1.

Party wall insulation fills the gap in-between, ensuring heat and sound are captured and contained – improving acoustic and thermal performance.

High-quality insulation helps to:

  • Adequately soundproof walls
  • Improve energy efficiency
  • Raise fire resilience2

Separation walls can substantially increase the acoustic performance, especially when it is designed and built as a wood or metal-framed construction.

Roger Peeters

ROCKWOOL Group Product Manager

Calculator and savings

To work out the amount of insulation you’ll need, measure the length and width of the space you’re installing in and multiply – this will give you the m² area of the wall.

It’s also helpful to know the depth of the cavity wall space. This will determine what insulation thickness you require and how many layers you’ll need.


applications, facade, internal walls, how to
With a range of dedicated products for party wall applications, ROCKWOOL insulation meets specific needs such as good sound insulation and high fire resistance.

Roger Peeters

Global Product Manager, ROCKWOOL Group

Case studies

The challenge

The DUO Residences twin tower development in Ophir-Rochor, Singapore, involved construction of 660 luxury flats in one tower, while the other included a five-star hotel, office and retail units.

Architects were keen to reduce noise transfer between luxury units and penthouses. They also wanted to increase thermal performance.

The solution

ROCKWOOL insulation was chosen for separating walls, thanks to its excellent sound absorption qualities.

Fire resilience was another crucial factor. Stone wool not only allows walls to ‘breathe’ by letting air pass through, boosting air quality, but also withstands temperatures of up to 1000°C.

The results

  • Less noise travelling between residences
  • Comfortable indoor temperatures
  • Safer environment for residents
Marina One multi-purpose complex, Singapore, towers, urbanisation, indoor comfort, health and wellbeing, insulation, high-rise, quiet, mixed use, city, skyscrapers
DUO Residences is a Green Mark Gold Plus-rated building, and we’re proud to provide insulation solutions that enrich the lives of residents.

Alex Low

Country Sales Manager, ROCKWOOL Singapore

Sustainability and energy efficiency

ROCKWOOL party wall insulation is manufactured in an environmentally-friendly way.

We use sustainably-sourced diabase rock to create our stone wool solutions9. More than 38,000 times the amount used to manufacture ROCKWOOL products is generated naturally each year10.


kernrock 033, kerndämmung, dämmung zweischaliges mauerwerk, wärmeschutz, core insulation, insulation of double-layer masonry, wall insulation, thermal insulation, press, presse, Germany


Does soundproofing a party wall work?
Can you improve a party wall’s u-value?

Looking for answers? Let us help!