Each type of commercial roof has its own set of weaknesses, which is why there’s a different way of inspecting each one. If you’re doing a quick preliminary roof inspection, start with the flat roof’s most vulnerable points. Timberline Roofing & Contracting, an expert roofing contractor, lists the weak points for each roof as well how you should inspect them below.

Flat Roofs 

In general, flat roofs are susceptible to UV and moisture damage. Due to their low slope, flat roofs are more exposed to sunlight. UV rays can quickly break down the roof’s surface. That’s why a preliminary inspection should start with the membrane, the roof’s first line of defense.

Built-Up Roofing 

Built-up roofing is composed of interlaced layers of fabric and asphalt. Manufacturers add a layer of gravel as a form of UV protection. If you find bald patches on the roof’s surface, have a contractor conduct commercial roofing repair as soon as possible.

Keep an eye out for gaps in the roof’s surface, particularly near the rooftop penetrations and the flashing. These are weak points on any roof. Water tends to pond on flat surfaces, so it’s easier for moisture to infiltrate your roof through cracks and holes.

Modified Bitumen 

Like built-up roofing systems, flat roofs with modified bitumen membranes also have a layer of gravel. Even among flat roofs, modified bitumen membranes are one of the most vulnerable to moisture. That’s because standing water can easily damage modified sheets.

Keep in mind that this guide isn’t a replacement for an inspection done by a roofing professional. To make sure you don’t miss any warning signs, have a certified contractor inspect your flat roof.

Looking for a certified contractor in your area?

Timberline Roofing & Contracting, a GAF® Master Elite™ contractor, offers a wide range of roofing services, including residential roof installation services. To get a free estimate, call us at (612) 263-9700 or (507) 200-8880. Or you can leave us a message on this page. We serve homeowners in Minneapolis, MN.