A guide to understanding the multiple designs and applications of flat roofing systems.
There are several flat roof systems available, and it can be difficult to decide which solution is right for your roofing project. Each is designed to protect the roof from the elements and waterproof it, in general. But each offers a different design and technique to install. To make the best selection, you may need a professional roofing contractor who is familiar with all of them. You can then understand the various pros and cons, and costs and longevity of each, to move forward with your flat roof project.
Three Primary Flat Roof Systems
While the applications and recommendations may vary, there are three primary flat roof systems to consider. These designs each present their own unique benefits as well as their own drawbacks. Before you decide what your roofing project needs are, it may be helpful to understand the basics behind each technique.
Modified Bitumen: This system is an asphalt-based roofing solution that makes use of a multi-ply design. These roofing membranes are also modified with either plastic (APP) or rubber (SBS) to increase flexibility. As multiple layers are aligned, the seams are joined with torches or hot air welders to create a watertight layer. This solution is a favorite because of its uniformity in sheet quality, as well as this flat roof’s ability to sustain more extreme temperatures than other styles. Sometimes, a Modified Bitumen system is used in conjunction with the Built-up Roof system, creating a hybrid solution out of both methods.
Single Ply or TPO: This is one of the most common flat roof systems and is a design that features a single-ply design, usually in sheets of a plastic membrane (PVC or TPO based.) Many professionals will tell you TPO is the best of both EPDM and PVC combined, but again, your needs may vary. This method usually welds the single layer of sheets to create that waterproof protection. Roofing contractors and building owners alike enjoy this design’s consistency in product quality, lightweight flexibility, and ease of installation. Customers tend to also appreciate the added energy efficiency of the Single-Ply method. Because the materials are lighter in color, they offer reflective properties that customers can see in their heating and air conditioning bills as savings.
Built-Up Roof or BUR: A built-up roof design includes the installation of multiple layers of sheets that are often bonded together. This watertight seal is secured with tar and gravel across the seams of multiple layers. This system is one that roofing contractors for ages have considered to be tried-and-true. BURs offer super durable layers and thick coverage. The gravel surface is highly resistant to aging and weathering.
Which Flat Roof System is the Best?
The only way to tell which flat roof system is the best for your roofing project is to consult a professional who has expertise in each method. Contact us today for your free flat roof replacement estimate. One of our trained professional roofing contractors can help you determine which of these solutions is an ideal fit for your building.