HARDROCK Multi-Fix (DD)

Warm Roof Insulation

A warm roof consists of warm flat roof insulation and is an airtight construction, without any gaps. The waterproofing membrane is placed directly on top of the insulation. 

Insulation is generally applied directly on top of the steel, concrete or wooden deck, with a vapour check layer often installed below the insulation – towards the deck – to make sure that no moisture can penetrate the construction. 

This helps keep out cold air and create a comfortable temperature indoors1

ROCKWOOL warm roof insulation is made from stone wool and designed to achieve maximum thermal performance. It’s also non-combustible, with exceptional acoustic properties.

Without proper insulation, properties will lose more heat in the winter – resulting in greater energy use to warm them effectively. During the summer, heat will easily come in, increasing the need for cooling.

Warm Roof Insulation Products

Why do we need warm roof insulation?

Warm roof insulation is important because it keeps out the cold air and conserves the heat inside a building. When installed between and above the rafters, it helps to create a warm layer that prevents any air from outside getting in.

As one of the most effective ways to prevent heat loss, it is the most favourable way to insulate flat- and pitched roofs and make the most of the space, both simplifying the design and helping to lower costs2

 

Warm roofs are the umbrella generating spaces to live and work.

Kim Brandt

Global Product Manager, ROCKWOOL Group

Calculator and savings

Buildings with warm flat roofs typically use less energy to heat or cool the indoor space, making it a great investment for industrial, domestic and commercial properties. Bills should generally be lower, and the building’s carbon footprint reduced. 

When planning your project, the insulation thickness can be set to almost any specification. Warm flat roof insulation is highly effective – and often a key part of the energy saving potential for the entire building envelope.  

Globally, the average installed density of stone wool insulation for warm flat roofing is approximately 100 – 170 Kg/m3 depending on the type of system.

You should recoup the installation cost within five years, with research suggesting it can save you up to £285 per year on energy bills. (Source: https://energysavingtrust.org.uk/home-insulation/cavity-wall)

Use our ROCKWOOL U-Value calculator to determine the potential thermal performance of your roof insulation. 

 

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Case studies

The new Apollo Tyres factory in Hungary was constructed to produce millions of truck and car tyres each year – with high amounts of combustible material on-site.

 

The challenge

The company wanted to boost fire safety for its employees. Reducing energy costs and the building’s carbon footprint was also a major concern.

 

The solution

Architects suggested installing 190,000m² of fire class A1 ROCKWOOL insulation into the factory roof to increase its overall fire performance. The insulation also helped to reduce the carbon footprint and improve interior climate conditions inside the factory for the workers7.

 

Reference case, Taulov Dry Port, Hardrock, building site, FRI, roof, construction
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17.2 MB

The ROCKWOOL Red Book

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Flat Roof Application Guide

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1.0 MB

Tapered Roofing Guide

Download our interactive insulation specification guide

Financial support

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

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