Roof Insulation

Effective and durable roof insulation increases the energy efficiency of residential and commercial properties, whatever the time of year .

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Flat roof Pitched roof Attic Insulation

As well as preventing significant heat loss from residential and commercial properties in cold climates, it is also designed to keep the cool air in during hot weather. Increasing the energy efficiency of a building can also mean reducing bills and operational costs.

We supply a variety of insulation products for flat or pitched roof applications. From steel, concrete or warm roofs to rafter line or loft insulation, ROCKWOOL products are made from premium stone wool to keep your properties safe and the indoor environment comfortable.

On top of the good thermal performance, the fire-resistant and acoustic properties of ROCKWOOL products also allow for more freedom in your designs.

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Why do we need roof insulation?

Installing effective insulation in homes and commercial properties can reduce heating requirements by up to 70%.¹ Those that are not effectively insulated can lose approximately a quarter of heat through the roof. As well as the warm air escaping, there’s the chance that cold air can also enter through a roof that isn’t in good shape.

In hot climates the opposite can occur, where keeping a building cool is essential.

Insulation helps to maintain the building’s correct temperature, so you can get creative with the results. Turn a loft area into a living space or an extra bedroom, or turn a flat roof into a welcoming terrace or green roof.

Insulating a flat or pitched roof can help:

Prevent heat transfer
Increase the energy efficiency of a property
Save money on heating bills
Reduce the carbon footprint of a property
Improve summer comfort

Relevant resources

Calculator and savings

Every home and business is different. With various sizes and dimensions of flat or pitched roofs, as well as budgets and bills to consider, there’s no one-size-fits-all solution.

Heating and cooling buildings accounts for 35-60% of total energy demand around the world.² The savings homes or businesses stand to make by reducing energy bills can more than make up for the costs of roof insulation.

In terms of money that can be saved, energy use and reducing the carbon footprint, installing roofing insulation is well worth the investment.

In addition, the building insulation ROCKWOOL sold in 2019 will save 100 times the carbon emitted in its production over the lifetime of its use.³

ROCKWOOL applications incorporate the latest BIM techniques to determine the required thermal performances for a project. This helps to predict the costs of an individual project, whatever the size and scope. We provide a selection of tools to help you calculate thermal performance – and therefore what costs a project potentially incurs.

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Insulation, construction, roof, attic, loft

Why choose ROCKWOOL solutions?

ROCKWOOL products – including roof insulation boards, slabs, rolls and granulate – are specially designed to cope with a variety of conditions. Our experts can be on hand to help facilitate the smooth and speedy installation with local fitters, while the materials used in the build are maintained to the highest safety standards.

Available in a selection of sizes and thicknesses, our innovative stone wool products are both durable and effective for the lifetime of your building.

Our flat roof range maintains its high performance against cold and moisture, while the versatile installation methods of our pitched roof products means you can protect your project with above, in between and below rafter insulation or with easy-to-fit loft floor solutions, to achieve the best results.

Benefits of our stone wool insulation include⁴:

Thermal properties

Specially treated stone wool has optimal insulative properties. Warm air can be trapped inside the home and cold air can be kept out to maintain comfortable temperatures.

Noise-absorbing

The acoustic properties of stone wool can better contain sound within a building, providing better acoustics for budding rock stars, or keep it outside for high focussed office workers and eager students alike.

Sustainable

Stone wool is both a natural and plentiful source. By choosing to use fewer alternative materials we’re maintaining sustainable practice – vital in the construction industry.

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Case Studies

The project

A large-scale field monitoring study was implemented in the Lower Mainland of British Columbia with the intent of measuring the impacts and benefits of roof membrane color and insulation strategy on the long-term thermal and hydrothermal behavior and performance of conventional roofing assemblies.

The challenge

Laboratory measurements were made of the apparent R-value/inch for each insulation product and then the results were used to determine the apparent R-values of the three insulation arrangements for this study.

The solution

The field monitoring component of this study has found large differences in heat flux and the interior and exterior surface temperatures due to light to dark membrane color. Significant differences in the heat flux and interior and exterior surface temperatures were also found with respect to insulation strategy, which is a finding unique to this study. An apparent thermal lag is observed within the stone wool insulation and hybrid insulation assemblies compared to the polyiso insulation. This finding presents as dampened heat flux measurements, reduced cap sheet surface temperatures, and lower interior surface temperatures, primarily when the roof is heated by the sun. At night, the differences between the assemblies are very small. This thermal lag is caused by a combination of the temperature dependency of the polyiso insulation as well as the
increased thermal mass of the stone wool insulation as compared to the polyiso (approximately 3.4 times greater), and may also be impacted by latent heat transfer through the assembly.

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The excellent acoustic performance of ROCKWOOL stone wool is an important advantage…the highly detailed cut-to-fall plan [also] helped us a great deal.

Gert Biebauw

project leader at Bureau Bouwtechniek

Roof Insulation applications

Insulation

Pitched Roof Insulation

Discover ROCKWOOL Pitched Roof Insulation for the ultimate in thermal, acoustic and fire performance solutions. Insulate with stone wool for the future.

Insulation

Low Slope Roof Insulation

Low slope roof insulation can reduce energy costs and create an additional roof space. Discover all the benefits of ROCKWOOL flat roof insulation today.

Installing

Details of how to install our products for flat or pitched roofs can be found on the sub-application pages. To accommodate for local requirements and regulations, specific product information is available on our local product pages.

Key things to note:

Ensure the construction is in good shape before placing insulation materials.
Wait for dry conditions before laying insulation.
Have all necessary PPE to hand

Roofing Installation Guide - Technical Guide

Sustainability and energy efficiency

Sustainability is at the heart of everything we do. Rock is one of the earth’s most abundant, most sustainable resources, and it’s our belief that the clever use of this rich material can help save others from being depleted before it’s too late.

By installing insulation sourced from innovative stone wool, our products can help reduce the amount of energy that needs to be used to heat buildings – and save money on energy bills too.

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Specialist roofing insulation can also increase the acoustic properties of a larger build where noise pollution could be a problem, such as urban homes, buildings near airports, libraries and schools.

8 facts about the circularity of stone wool