Inverted Warm Deck Roof Advantages

This roof construction called a cold roof does have some disadvantages.

Inverted warm deck roof advantages. Inverted roofs are able to exceed building regulations part l requirements and have many advantages. Warm flat roofs make it easier to eliminate cold bridging. This makes it the only material suitable and approved for inverted roof applications. Rigid extruded polystyrene insulation has minimal water absorption due to its closed cell structure.

A warm roof is breathable allowing moisture out. The simplicity of a warm flat roof makes it one of the most popular designs providing an effective and easy way of insulating a building. Also known as a protected membrane or upside down roof inverted roofs employ insulation which can resist water absorption provide excellent thermal performance be unaffected by freeze and thaw cycles withstand surface traffic and be protected from uv and mechanical damage among others. No vapour control layer is required.

Ventilation of the ceiling space is required as there is a risk of condensation forming on the underside of the roof deck. We would like to show you a description here but the site won t allow us. A breathable roof ensures there is no moisture build up which can lead to fungal or mould growth. The traditional method of constructing a low slope membrane roof is to install insulation between the rafters leaving an air space between the insulation and the roof deck above see figure 1.

An inverted roof is quite simply where the waterproofing layer is installed over the structural deck rather than over the insulation. Inverted roofs because of the need for ballast paving or vegetation inverted roofs typically weigh about 90kg m2 which means the structural load is the main limit on their application. Warm flat roofs create little or no thermal bridging. One of the main benefits of the inverted roof method is that the membrane is protected by the insulation from the expansion and contraction caused by weather fluctuations such as frost and solar radiation.

Allows heat to be conserved with no requirement for roof void ventilation. This ensures there is no unnecessary heat loss through joints or fixings.