Choose a different country or region to see content relevant to your location.
Roofing system on concrete deck

Concrete deck insulation can greatly enhance the energy efficiency of your building. In an uninsulated or poorly insulated property, a great deal of heat is lost through the roof1, making it an especially crucial area to focus on.

ROCKWOOL concrete flat roof insulation provides excellent thermal, acoustic and fire resilient benefits, helping to create a more comfortable living or working space within2

Not only does the use of our products help to lower energy bills and reduce health risks3, but by reducing the energy needed to heat or cool the building, our premium-quality stone wool insulation also helps to cut carbon emissions too. 

Why do we need concrete deck insulation?

Concrete deck structures are typically used in connection with larger industrial, commercial or institutional buildings. However, they are also becoming increasingly popular in residential designs – particularly in high rise apartments. 

As a valuable addition to this building design style in towns and cities across the world, quality concrete roof insulation can provide extra protection from overheating in warmer climates and cold temperatures in cooler regions.

This raises energy efficiency, and provides great long-term value and sustainability for constructions. 

Calculator and savings

How much insulation you’ll require depends on the size and shape of your project. Since there is usually no limitation to the installation height on a roof, insulation thickness can be adjusted to your specification – and to reflect the local regulatory energy demand.

The ROCKWOOL U-value calculator is an excellent tool to help assess the energy performance which can be achieved with concrete deck insulation.

Calculate, calculation, calculator, u value, u-waarde, office, architect, voorschrijver
Our dedicated solutions for concrete deck insulation are fitted to modern, safe and fast application standards, whether the flat roof installation is mechanically fixed, glued or ballasted.

Kim Brandt

ROCKWOOL Group Product Manager
To be updated
580.4 KB

Flat Roof Acoustic Reference Guide

To be updated

Flat Roof Application Guide

To be updated
17.2 MB


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

Financial support

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

Energy Efficiency, Key, Keyboard, Button



How thick should concrete flat roof insulation be?

The thickness of insulation should be determined by the structure itself, desired results and the local requirements in your area. It’s best to design your solution to be safeguarded for future energy efficiency, and any upcoming environmental regulations. Contact our local offices for more information.

How do you insulate a flat concrete roof?

A flat concrete roof is usually insulated using a warm deck construction method. This is where the insulation is installed above the deck. How you insulate your roof will depend on local building regulations in your market. We can assist with your project if you require more information.

Does a concrete flat roof need ventilation?

If you insulate a concrete flat roof using a warm deck construction method, there is no need to add ventilation. This also ensures a reduced risk of condensation.