Thermosets and thermoplastics
In general, single-ply roofing systems can be categorised into two types; thermosets and thermoplastics. Thermosets are normally made out of rubber polymers and so have to be installed using tape or a contact cement because hot air welding will alter their physical properties. A common example of thermoset single-ply roofing is ethylene propylene diene monomer or EPDM. These are renowned for longevity in terms of weather resistance, temperature fluctuations, and UV damage. EPDM is usually applied in thicknesses of 30-90mm and is ideal for covering large surfaces. Thermoplastic is the other form of single ply membrane. Unlike thermosets, thermoplastics are installed using heat, which forms a tight seal along the laps. Once cooled, their properties return to their original form. PVC is a common type of thermoplastics single-ply roofing system and it often includes a felt lining for additional protection. PVC is a fire retardant and is normally applied with additional processing aids such as stabilisers, pigments, fillers, plasticisers and biocides which all help to prolong its life. TPO is another common thermoplastic single-ply roofing system, however, it the processing aids often need to be applied by the contractor. It is important to note that with all types of thermoplastic single-ply roofing system, repairs and maintenance is fairly easy because of their use of hot air welding.
If you require more information about single-ply roofing systems or would like a free, no-obligation quote, please contact our professional and friendly team on 0