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Different Types of Flat Roof Coverings

There are many different types of flat roof coverings available. Here we go through each different type available:

Felt Flat Roofing

Felt is the traditional material used for flat roofing. It has proved its effectiveness as a roofing system over a long period of times. Now it has been further developed and improved as a material to strengthen its properties as a roofing material further.

Built Up Felt Flat Roofing

Built Up Felt Roofing is a multi-layer waterproofing system consisting of 2 to 3 layers of felt bonded together with adhesive or hot bitumen. A typical system would include a vapour control layer, thermal insulation and the 2 to 3 layers of felt on top. This is a tried and tested method of waterproofing roofs. Built Up Felt Roofing is a particularly useful solution for refurbishment projects such as hospitals or schools (see image above).

Torch on Felt Flat Roofing

Torch-on felt is applied with a blow torch.  This process was developed to reduce the need to pour and roll hot bitumen.

The typical roof consists of three layers, the vapour control layer, reinforced felt and the cap sheet.

Vapour Control Layer

A vapour control layer helps you protect your building from the consequences of condensation. Condensation is formed when warm moist air rises and condenses into a liquid on contact with the colder surfaces above the insulation. The idea behind a vapour control layer is to install it on the room side of the insulation so it blocks the passage of warm moist air entering the structure.

Reinforced Felt Layer

• Reinforced with fibreglass to support flat, more uniform shingle application

• Unlike standard felt, it resists curling or pulling away from fasteners when exposed to moisture or wind

• Increased tear strength to resist tears when walked on or in windy conditions, as compared to standard felt

Cap Sheet

The cap sheet allows you to choose the colour to finish your felt roofing (in the picture above the cap sheet is red). Also, the cap sheet makes repair work a relatively straightforward and in expensive proves. All that is required is to apply a patch of felt on to the damaged area with a blow torch. Although relatively straightforward repairs will need to be carried out by a professional roofing contractor.

Torch on felt roofing is an excellent choice because of its cost effectiveness, its proven credentials further enhanced by recent technology and the ease of maintaining it.

GRP Fibreglass Flat Roofing

GRP (Glass Reinforced Plastic) Fibreglass Roofs have become increasing popular. It is one of the most expensive roofing materials and has a smooth and aesthetically pleasing finish. 

A correctly installed fibreglass roof will last for at least 30 years with no measurable deterioration. The roof must be laid onto a dry deck in dry conditions at a temperature not below 5°C. It must be ensured the top coat is used is compatible with GRP Roofs.

EPDM Single-Ply Membrane

EPDM is basically a rubber material. It is made from recycled strips of rubber that are bound together.  EPDM is waterproof weather resistant and long lasting. It is important to ensure your installation is carried out by a professional roofing contractor as incorrect installation can lead to leaks due to improper fitting especially around the edges of the roofing system.

Mastic Asphalt

Mastic Asphalt is a versatile construction material used for a whole range of production projects, both new build and refurbishment projects, where an easy, seamless, long lasting finish is needed. It offers overall waterproofing for roofing and tanking and acts as a hard deck surface in flooring and paving. If correctly designed and laid it can last 50-60 years. In addition to this, it's also fully recyclable. A disadvantage of mastic asphalt is it requires hot works.

Metal Roofing

Metal roofing is an expensive flat roofing solutions which is extremely versatile. There are different metals to choose from aluminium, steel, zinc and copper. It is also possible to choose a range of colours and finishes. As well as the price, another potential downside of metal roofing is in heavy rains the noise of the rain hitting the metal can become annoying.

If you need any advice on which material to choose for your flat roof covering and are in the Woking or Guildford area, Raynes Roofing would be delighted to help you. With over 45 years’ experience we will be able to advise you on the best material for your replacement flat roof just get in touch today or call us on 01483 475141.