Flat Roof
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Various types of flat roofing systems are used mainly for commercial and industrial buildings. The information provided in this write-up about different flat roof systems will help you to know more in this regard so that you can use it while dealing with the roofing system of your establishment.

Types of flat roofing systems

Built Up Roofing or BUR : It is the mostly commonly used flat roofing system used for installing and repairing the flat roofs. It is also known as asphalt roofing or tar and gravel roofing among roofing experts. This roofing system usually contains the alternate layers of reinforcing fabrics or roofing felts and bitumen including coal tar and asphalt to create a finished membrane of the roof which may several layers according to the plies of the roof. The lower most sheet of this roofing is mechanically fastened to enhance the solidarity of the roof. It usually sticks completely to the roof insulation or decks if applied directly.

Single-Ply Membrane roofing: The single ply membrane roofing is manufactured in factories for installing or repairing flat roofs. This roofing system can be classified into two categories- EDPM or thermoset roofing and TPO or PVC or thermoplastic roofing. Any of the three processes including calendaring, extruding or spread coating are used to manufacture single ply membrane roofing by including reinforcement layers of scrims or polyester fabrics with felt, fleece or glass fibre backing.

EPDM Single-Ply Membrane roofing: EDPM or Ethylene Propylene Diene Monomer single ply membrane roofing made of synthetic rubber is normally used for installing or repairing low slope roofing surfaces. The thermoset materials used in it is irreversibly set or solidified after heating. It is the most common form of single ply membrane roofing used this purpose since long due to its durability and long lifespan ranging between 15 and 25years. It is normally installed for the roofs facing inflexibility, weathering and failing joints problems as well as for preventing leakages. It is preferable to BUR due to its inexpensiveness.

TPO and PVC single ply membrane roofing: This type of single ply membrane roofing is made of Thermoplastic materials can be repeatedly hardened when cooled and softened when heated. These membranes can be stitched together with the help of solvent or hot air welding due to the chemical nature of their material. They can further be classified into PVC membrane roofing and TPO membrane roofing.

TPO or Thermplastic Olefin membrane: This type of membrane roofing is produced by joining TPO sheets made by blending the polymers of ethylene propylene, reinforced polyester and polypropylene with lamination through extrusion, calendaring or extrusion coating technique. In order to enhance the usefulness these sheets flame retardants, UV absorbers and colorants are also included in them

PVC roofing membrane: The membrane roofing of this category is produced by reinforcing PVC sheets with glass fibre or polyester scrim or mat through spread coating, extrusion or calendering technique. In order to enhance the flexibility and other physical properties of these sheets stabilizers and plasticizers are also included in them.

Modified Bitumen roofing: The roofing membranes of this type manufactured in roll material are composed of polymer sheets reinforced with fabrics to serve as carrier for the polymer-modified hot bitumen. The in this membranes roofing system contain several layers like BUR roofing and can be installed fully adhered like a two ply roofing system. MB roofing system is available in two types of membranes- SBS polymer modified membranes and APP polymer-modified membranes.

SBS polymer modified membranes are normally installed with cold adhesive or hot mopped asphalt like BUR roofing. These are self adhering membranes as they contain adhesive on their back.

APP polymer-modified bitumen membranes are typically torch applied or heat-welded to the roof.

The roofers use plasticised asphalt for installing APP polymer-modified membranes and rubberised asphalt for SBS polymer-modified membranes. The names of MB and EDPM roofing systems usually confuse the consumers as roofers usually use them idiomatically in their spoken language.

Metal Sloped Roofing: Along with modified bitumen roofing systems metal roof flashing is also used for giving smooth and laminated look to the surfacing on the sloped roofs.

Thus, after getting information about different flat roof systems you can easily choose one according to the roof type of your commercial establishment.


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