Flat Roof Systems

Making sense of roofs. Making wise choices.

NEDLAW Roofs is accomplished in the installation and maintenance of all major roofing systems. We appreciate that each system has its own advantages in different applications, structures and uses. We can help you select what best suits your need and customize as necessary.

The roofing industry is continually evolving and improving to address current day issues, trends and product improvements. Nedlaw prioritizes maintaining close relationships with our suppliers so as to always be aware of product improvements and more effective installation techniques. Our staff continually participates in upgrading their skills with our manufacturing partners to ensure we are up to date and effective with product selection and installation processes.

Flat roof systems have recently seen a shift to the use of ‘cold’ products including various self-adhering membranes and adhesives. Nedlaw embraces these new products and upgrades staff training to ensure quality is maintained with current techniques.

Leadership in Energy and Environment Design
NEDLAW flat-roof systems can be applied toward LEED points in several ways — from installation of white membranes resulting in heating and cooling cost reductions to installation of living roof systems resulting in storm-water management.


Available Types

Built-up Roof Systems

Built-up roofing systems, which have been used for almost 150 years, consist of multiple plies of reinforcing felts laid shingle fashion into continuous moppings of hot asphalt or cold adhesives. The system is then covered with aggregate set in an asphalt flood coat or final cold adhesive application. The plies can consist of organic membranes or glass fiber membranes.


Modified Roof Systems

This type of roof system uses modified bitumen membranes, which are factory-rolled products with rubberized or polymeric asphalt applied to one side at the factory. It can be installed by mopping on hot asphalt to adhere the membrane to the roof or, more commonly, by using a propane torch to heat the underside of the coating. Melting to a near-liquid, the membrane is then rolled onto the roof in a continuous operation. Recent product advances have led to the development of self-adhering membranes and membranes that are applied with adhesives, eliminating the need for hot asphalt or open flame applications.


EPDM Roof Systems

EPDM roofing systems, also known as single-ply systems, are factory-fabricated, rubber-roofing membranes, which are available in several thicknesses. Primarily, they are synthetic single-layer sheets of ethylene propylene diene monomer. EPDM systems can be installed using a variety of methods, including loose-laid and ballasted, fully adhered, or mechanically attached means.


Thermoplastic Roof Systems

This roofing system is similar to the EPDM system. However, its synthetic single-ply membrane sheets are made of a number of other materials, most commonly polyvinyl chloride (PVC) and thermoplastic polyolefin (TPO). These membranes are available in a variety of thicknesses and colours.


Protected Membrane Roof Systems

Protected membrane roof systems generally consist of a polyester fabric sandwiched between two layers of hot rubberized asphalt. This versatile system is suitable for use in a wide range of applications — whether above-grade or below-grade, horizontal or vertical. This method, which is referred to as “hot rubber” when used on parking garages, parking decks, foundations and walkable decks, requires a specialized oil bath kettle to heat the rubberized asphalt.


Living Roofs

Through our partner company, NEDLAW Living Roofs™, we can add a living roof application, also known as a green roof, to most available types of roof systems. Living roofs are an innovative yet time-honoured roofing solution that incorporates living plant materials. Living roofs have proven to lower heating and cooling costs, reduce green house gases and extend a roof’s lifespan.