Warm Roof Insulation

A warm roof consists of warm flat roof insulation and is an airtight construction, without any gaps.

Find products

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.

Find Inspiration, guides and reports

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.

Relevant resources

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 can use your market’s local U-value calculator to work out the potential energy improvements and savings you could make with your project.

Learn about energy efficiency

roof insulation, flat roof, bitumen seal, adhesive-friendly surface, dach+holz 2020, bitrock, bitumenabdichtung, klebefreundliche oberfläche, dachdämmung, flachdach, presse, germany, presse, press

Why choose ROCKWOOL solutions?

Our insulation uses powerful stone wool to help keep the warmth inside your building – and block the outside noise out.

When applied above the roof deck, warm roof insulation provides an added layer of protection that retains heat, helping to create a comfortable environment inside.

Effective for the lifetime of a building³, our stone wool insulation is quick and easy to install whether you’re working on blocks of flats, schools or other buildings with a flat roof.

ROCKWOOL products give you the ultimate peace of mind:

Effective insulation engineered to last the lifetime of a building⁴
Fire protection which can withstand temperatures of up to 1000°C⁵
Acoustic solutions that reduce noise from weather and urban life

Effectiveness

As 66 percent of energy consumption in buildings is used for heating, cooling and ventilation⁶ , our insulation helps to reduce this by maintaining an optimum indoor temperature.

Robust and durable

ROCKWOOL product structures are flexible with a high point load – having no movement when exposed to heat, cold and moisture.

Acoustic protection

Sound reduction is also a key feature of our insulation. It can help to absorb and block out noise from urban life and harsh weather conditions.

Find ROCKWOOL products

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.

Find more case studies

Applications

Insulation

Metal Roof Insulation

Improve energy efficiency and acoustic performance with ROCKWOOL metal roof insulation. Our solutions are resilient, long-lasting and non-combustible.

Insulation

Concrete Deck Insulation

Installing concrete deck insulation can significantly reduce your energy costs. Discover the benefits of ROCKWOOL concrete flat roof insulation today.

Insulation

Steel Deck Insulation

Enhance your building with ROCKWOOL steel deck insulation. Durable and fire-resistant, our insulation is designed to be energy efficient and long-lasting.

Installation

Key tips:

Before starting, accurately measure the roof space
Clear the roof surface of any loose debris
Lay the boards tightly with staggered joints⁸

Inspiration and guides for professionals

Are you a professional?

Our sales package that can boost your business includes:

Guide on how to sell a premium job
Tips & tricks to do an expert installation
Advice on effective communication with customers
Frequently asked questions by other professionals and customers
Boost your skills by watching our installation videos

Sustainability and energy efficiency

All our products are designed to be robust and energy efficient.

Creating functional and sustainable insulation is part of our core values to help improve modern living for the future – and to care for the environment.

ROCKWOOL warm flat roof insulation is part of our aim to help buildings reach global building standards in their local markets, by making them affordable, energy efficient and environmentally friendly.

Our products are created to ensure the towns and cities we build today are sustainable for the future⁹.

8 facts about the circularity of stone wool

Reference case, Kay Fiskers Plads, REDAir, building site, GBI, facade, office building, construction, reclaim waste, recycling, sustainability

Downloads and resources

By Stephen Leahy

Water management

Urbanization

Green roofs can keep cities cool and dry

Growing plants —including trees and vegetables — on rooftops can buffer the impacts of climate change and green-up the world’s cities.

By Jan Simonsen

Renovation

Energy Efficiency

Seven efficient tips on how to keep your house warm in winter

Humans spend around 90 percent of their time indoors, so it’s in your best interest to safeguard your own home and ensure that warm air circulates throughout.

Thought Leadership

Energy home improvement

Upgrading insulation creates a better living environment and saves money.

By Vincci Morales

Energy Efficiency

Wellbeing

Quality of life

5 questions you should ask when buying a new house

Discover crucial tips for buying a newly built house.

By Vincci Morales

Health

Wellbeing

Quality of life

The key to a stress-free home

Want a stress-free home? Quality construction certainly helps.

Financial support

Local government grants and subsidies may be available for insulation if your building or household is eligible. Sustainability schemes and refunds may be available through tax reductions or incentive schemes. Contact our local offices for more information.

Find your local ROCKWOOL office