Flat roof membranes — Maleko

Flat roof membranes - Maleko

Roofing materials

Modified bitumen membranes are the most common flat roof coverings. Depending on the roof slope, these materials can be installed in one or several layers.

Bitumen roof coverings contain elastomeric or plastomeric modifiers, they are flexible and covered with slate flakes to protect them from UV and minor damages. The materials are reinforced with polyester or fibreglass fabric.

Based on the polymeric modifiers used, the bitumen materials can be divided into two basic types:

SBS (styrene butadiene styrene) materials contain elastomeric modifiers that ensure excellent flexibility of SBS materials even at low temperatures, they are covered with slate flakes to protect them from UV and can withstand temperature fluctuations.

APP (atactic polypropylene) materials contain plastomeric modifiers and have excellent UV resistency (APP materials do not need a slate flake layer for UV protection), they are flexible and with high heat tolerance.

Single-Ply roofing membranes

Single-layer roof coverings are increasingly used in modern flat roof construction. The term Single-Ply, indicating that the covering has one layer, is employed by the manufacturers of roof covering materials to differentiate the industrially manufactured roof coverings (e.g. PVC, EPDM, FPA, TPO) and other multi-layered or so called Built-up roof coverings.

Single-layer roof coverings have excellent physical properties; they are strong, very flexible, with a long life cycle and are characterized by stable and assured quality. They can be installed throughout the year and the roofing works are conducted only by workers who have passed special training.

Various installation methods enable extensive use of single-layer materials, providing a reliable roof covering for many decades.

The single-layer roof coverings can be divided into two major groups:

- Thermoplastic Membranes

- Thermoset Membranes

Thermoplastic Membranes consist mainly of plastic polymers. The best known among them is polyvinyl chloride (PVC). As a roof covering material, PVC was first used by PROTAN, Norways largest manufacturer of PVC materials, in the 60s of the past century. Protan roof coverings are safe present no danger to the environment. They are highly durable even in extreme Northern conditions. In order to achieve high flexibility they are manufactured using plastifiers and special supplements that ensure consistent resistance to UV; in order to achieve stable size and strength, the PVC roof coverings have been reinforced with fibreglass or polyester fabric. PVC roof coverings can be installed in various systems and practically on all surfaces. The materials are joined using thermal melting, which makes the joints as strong or even stronger than the material itself. In Estonia the most common type is PROTAN PVC roof covering, manufactured in Norway, with documented life cycle of 25 years.

Thermoset Membranes contain rubber polymer. Among them, the most widely used is EPDM (ethylene propylene diene monomer). EPDM is an elastomeric supplement, which ensures excellent UV resistance, outstanding flexibility and durability in case of very low and very high temperatures, as well as for many chemical compounds. The best characteristic of EPDM materials is the stability of their chemical structure and technical specifications, which results in a very long life cycle. The material is very strong and tolerant against other materials. EPDM roof coverings are usually black, but white and fire-proof versions are also available.


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