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Metal roof insulation is crucial for improving energy efficiency, acoustics, comfort and standards in commercial buildings. 

In an uninsulated building, the main source of energy loss is through the roof, making insulation a top priority.

The non-combustible nature of stone wool insulation makes it a robust choice for fire safety too. But it’s the superior sound insulation of the material which makes ROCKWOOL metal roof insulation solutions an ideal choice for built-up applications.

 

 

Why do we need metal roof insulation?

As heat rises, most energy loss is usually through the roof of a building. Metal roof insulation can enhance the energy efficiency of a building and help to reduce fuel costs. 

Our metal roof applications utilise both high-density and low-density products. High-density products support the metallic rain screen directly. Low-density products – 

typically rolls – act as an infill between the two metallic layers and their metal carrier.

Stone wool insulation also provides excellent acoustics for a metal roof – protecting against urban noise pollution and noise from the weather, such as rain and hailstones, which often pose a problem for metallic roof coverings.

Calculator and savings

Metal roof insulation can help property owners and tenants save money on their energy bills by boosting energy efficiency. 

A valuable investment for the future, it offers a relatively fast payback time in terms of money, energy and carbon footprint.

Insulation thickness can be adjusted to meet a wide array of customer specifications.

The average installed density of stone wool metal roof insulation globally is around 80 – 150 Kg/m3 for high density products supporting the metal deck, and typically around 27kg/m³ for lighter infill roll products. 

Use our ROCKWOOL U-Value calculator to determine the potential thermal performance and thickness required for your metal roof insulation. 

Flat roof, FRI, Metal Box, étanchéité bitume, bitumen roof-board, Rockfleece B Energy
ROCKWOOL solutions for metal roofs are durable and proven by more than 40 years of use. Our metal roof insulation is also non-combustible and will protect you, your building and inventory if a fire occurs.

Kim Brandt

Global Product Manager, ROCKWOOL Group

Case Studies

The project

Nottingham Girls’ High School in the UK wanted a state of the art performing arts facility installed. It had to demonstrate that it had been designed to both provide suitable control of rain noise reverberation – and achieve a noise performance standard of LAeq 30dB.

The challenge

Ensuring high levels of acoustic performance was a vital part of the project. The building had to prevent sound from reaching other areas of the school – while also reducing the impact from external noises, such as rain and other bad weather.

The solution

A combination of ROCKWOOL metal and flat roofing solutions were used to make sure that the department was insulated sufficiently for both heat loss and sound.

HARDROCK Multi-Fix products and a ROCKWOOL acoustic membrane were used in combination with other products on the structural deck of the roof.

Nottingham School for Girls
The ROCKWOOL roofing board’s open wool structure was ideal for absorbing and regulating noise in the building. Additionally, the acoustic membrane acted as a sounded deadening layer to prevent noise interruption during performances.

Kevin Dixon

NRA Roofing and Flooring Services Ltd, PROJECT MANAGER
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17.2 MB

The ROCKWOOL Red Book

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Flat Roof Application Guide

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975.5 KB

ROCKCLOSE Insulated DPC Datasheet

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1.1 MB

Full Fill Cavity Datasheet

Financial support

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

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Roofs

How do you insulate a metal roof?

To insulate a metal roof, use a low-profile inner sheet separated from a higher outer sheet. The resulting cavity must be treated to deliver the required acoustic, fire and thermal protection. 

Do you need to ventilate a warm metal roof?

A warm metal roof generally doesn’t require any ventilation, as the insulation is usually installed above the roof deck and possible vapour check layer. This prevents the excess moisture from coming into contact with the cold upper surface. 

How do you stop condensation on a metal roof?

The best way to stop condensation from accumulating in a metal roof is by insulating it properly and including an air-tight vapour check layer. See our products and installation guides for further details.