Built Up Felt

Built Up Felt Roofing Systems

Our business first began with built-up felt roofing systems so we have a great deal of expertise in this field.

Modified Bitumen systems can be one, two or three layer systems often incorporating insulation within their build up. They are factory manufactured into sheets or rolls for ease of application and quality control and are usually adhered using hot bitumen, adhesives or peel and stick applications. However, in some specifications, mechanically fixed systems are available.

There are three kinds of modified bitumen systems:

SBS (Styrene Butadiene Styrene) rubber modified bitumen systems are usually installed with hot bitumen or cold adhesives. This system is excellent at accommodating low temperatures and is very flexible. These membranes are manufactured from high quality distilled bitumen modified with polymers and selectively chosen stabilizing filler. This membrane has an excellent cold flexibility properties, stress resistance and dimensional stability characteristics. They also have good bending at low temperature allowing easy of handling during application. They can however be affected by UV-rays. To obtain a high UV resistance and resistance to aging, the upper surface of the membrane must be protected with a mineral coating or in an inverted situation.

APP (Atactic Polypropylene) polymer modified bitumen systems are installed using the torch method. These membranes are manufactured from high quality distilled bitumen modified with polymers and selectively chosen stabilizing filler. This type of membrane has excellent warm and cold resistance. This material is particularly suited to hot climatic regions. Its makeup is less sensitive to aging caused by UV-rays.

APAO (Amorphous Poly-Alpha Olefin) bitumen membranes are manufactured from high quality distilled bitumen modified with elastic layer measurements polymers, amorphous poly-alpha olefin and selectively chosen stabilizing filler. This creates outstanding three outstanding performance characteristics: warm, cold resistance and aging resistance.

Advantages of using modified bitumen systems:

  • Excellent flexibility in extreme weather conditions due to the high tensile strength
  • Easy to repair and maintain
  • Manufactured in rolls for ease of application
  • Factory-manufactured to ensure quality control
  • Accomodate movement of the building
  • Variety of surface finishes that resist oxidation and damage from UV rays

Installation techniques have improved since the introduction of modified bitumen systems and for customers preferring the reassurance of a cold applied system we can offer an adhesive solution thereby minimising the need for hot works.

Call us today on 0113 255 2739 or email info@everlastgroup.co.uk to find out more about any of our roofing services