If you’re looking to improve or replace your existing flat roofing system you may have heard of the terms “warm roof” or “cold roof” and aren’t sure what they are or what you should choose.
Essentially, a warm roof system is where the insulation sits above the rafters, whereas on a cold system the insulation sits below
Cold Flat Roof Systems
- Cost-Effectiveness – Cold flat roofs are generally less expensive to install compared to warm flat roofs. This is because they typically require fewer materials and less labor during construction.
- Ventilation – Cold flat roofs rely on natural ventilation, allowing air to flow freely between the roof deck and insulation. This ventilation helps to prevent moisture buildup and reduces the risk of condensation, which can lead to mold and mildew growth.
- Accessibility – Cold flat roofs are easier to access for maintenance and repairs since there is typically no insulation or other barriers between the roof deck and the interior of the building.
- Fire Safety – Since cold flat roofs do not typically use insulation materials that can be flammable, they may offer better fire resistance compared to warm flat roofs.
Warm Flat Roof Systems
- Energy Efficiency – Warm flat roofs are highly effective at insulating buildings, helping to maintain a consistent indoor temperature and reducing the need for heating and cooling. This can result in significant energy savings over time.
- Moisture Control – By placing insulation above the roof deck, warm flat roofs create a barrier that helps to prevent moisture from entering the building. This can reduce the risk of water damage and prolong the lifespan of the roof structure.of condensation, which can lead to mold and mildew growth.
- Space Utilisation – Warm flat roofs provide additional usable space within the building envelope, as the insulation is typically installed above the roof deck rather than between the rafters or joists. This can be advantageous for buildings where interior space is limited.
- Sustainability – Many warm flat roof systems use environmentally friendly insulation materials, such as rigid foam boards made from recycled materials. Additionally, the energy efficiency of warm flat roofs can contribute to overall sustainability by reducing the building’s carbon footprint.
