WIRRAL ROOFER

Though flat roofs are cheaper to construct than pitched roofs they tend to have a shorter service life than roofs constructed with slate or tile.

As well as the degradation of the top surface, older flat roofs can suffer from structural defects caused by a combination of rain water penetration and/or interstial condensation.

When having a flat roof repaired you may wish to take the opportunity to have new thermal insulation added.

Many older roofs have little or no adequate heat insulation. Having proper insulation fitted will help keep your heating bills down and keep the roof warmer.

There are three types of flat roof covering: 3-ply felt, EPDM rubber membrane and GRP (glass reinforced plastic).

The modern 3-ply felt system has increased durability compared with older versions. A newer — though thoroughly tested and guaranteed — EPDM construction can be more economic to install. Of the three systems GRP is the most costly to install. It is also the the most durable and is particularly suited to use on roofs where there are upstands or pipes, such as flues, which pass through the roof deck.

Please ask for advice on which system is most appropriate for your project.

Torch-on 3-ply felt process

Modern 'torch-on' 3-ply felt has now superseded the older bitumen bonded process and is more durable.

Two layers of vapour permeable felt are applied with staggered joints, topped off with a surface layer of mineral felt. It is important that your roofing contractor is competent in working with hot flame processes.

EPDM Rubber

EPDM (ethylene propylene diene monomer [M-class]) rubber is a relatively modern concept, developed using the latest chemical technology.

It is lightweight and is highly flexible meaning it will expand and contract in response to weather conditions without risk of cracking.

EPDM Firestone rubber membrane is guaranteed for 25 years.

GRP

GRP - Glass Reinforced Plastic is also commonly referred to as 'fibreglass' in the UK.

It is a composite of acid catalysed polyester resin and woven glassfibre matting. When the polyester cross-linking chemical reaction is completed the result is a joint-free strong, flexible and totally weatherproof surface. Because of its exceptional 'drape' characteristics GRP is ideal for use on roofs with steps or protrusions. Additionally it is hard-wearing so is used on roofs where foot traffic is expected.