Stone wool steel roof insulation provides extra thermal, acoustic and fire protection while saving energy costs – making it popular for both industrial and commercial projects. 

Our flat roof products are suitable for all manner of steel deck constructions. They’re sustainable, durable and fire-resistant, making them an ideal solution for an array of properties and building types1

They also act to enhance your building’s mechanical performance, allowing the deck’s use for a range of possibilities, and offering perfect dimensional stability in the process.

Why do we need steel deck insulation?

Steel deck structures, constructed as warm roofs and often made with a small slope, are typically used in connection with larger industrial or commercial buildings. In recent years, however, construction has become more commonplace for offices and even residential buildings.

Effective steel deck insulation can create a more comfortable living and working environment for inhabitants or workers, providing an important layer of acoustic protection against nuisance noise caused by overhead aircraft or the impact of weather, and thermal protection when the climate is especially hot or cold. 

In the long-term, insulation can also reduce energy costs by lowering the amount of energy needed to heat or cool the inside of the building.


The main benefits of quality steel roof insulation include:

  • Energy efficiency – up to 25 percent of energy is often lost through the roof of a poorly insulated building, leading to large energy bills. 
  • Increased fire safety – stone wool provides an extra layer of protection against the spread of fire and smoke. 
  • Acoustic blocking – our insulation offers an extra layer of protection from noise pollution. It also prevents noise from industry or entertainment venues escaping into nearby residential areas.

Calculator and savings

Our steel deck solutions generally offer a relatively fast payback time in terms of money, energy and CO2 footprint.

There is no set formula for how much of a given product you’ll need for your project. Instead, this will be determined by the size and shape of your building. To calculate how much you’ll require to achieve the performance you need, use the ROCKWOOL U-value and Acoustic calculators.


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ROCKWOOL solutions for flat roofs are durable and proven by more than 40 years of use in most markets.

Kim Brandt

ROCKWOOL Global Product Manager
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Flat Roof Acoustic Reference Guide

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An interactive specification guide for acoustic, fire and thermal insulation. ROCKWOOL will be regularly releasing new updates to ensure the content remains relevant and accurate, as well as evolving

Download our guides

Financial support

Check the Energy Savings Trust website to see whether there are any financial support schemes available for steel deck insulation. 

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