Commercial Roofing: The Different Inspection Processes

A typical commercial roofing inspection includes checking the roofing surface for punctures, removing debris around the drains and making sure that seams and flashing are intact. However, there are specific tasks that are unique to every roofing type. In this blog, roofing company Moss Roofing examines these differences in roofing inspections.

Built-Up Roofing

Built-up roofing (BUR) is what many people call “gravel roofs” because of the outer layer of gravel that provides protection against UV rays and solar heat. It is important that the layers underneath the gravel are not exposed to the elements. Therefore, a roofing inspector must keep an eye out for displaced gravel, as there will likely be exposed roofing layers in those areas. Splits and ridges in the outer ply may introduce water intrusion and will be marked for repairs.

Modified Bitumen

A typical modified bitumen roof is composed of a mechanically-fastened substrate and an outer layer of roofing that’s lined with bitumen on one side and lined with granule on the other, similar to asphalt shingles used on residential roofing systems. The bitumen layer is heated using a torch, and, while soft, serves as waterproofing and adhesive. Roof inspectors keep an eye out for signs of wear and tear, such as deteriorated sections of granules, ponding water and splits in the membrane.


Single-ply roofing is installed as a single monolithic layer of roofing on the substrate. It can be installed loose-laid, mechanically fastened, or adhered to the substrate using heat and adhesive. Single-ply roofing is a thin layer, therefore punctures and open seams need to be addressed immediately. The same goes for areas where flashing is installed. Pooling water also needs to be addressed immediately, as welded seams can deteriorate when submerged in water for more than 48 hours. Seams can be repaired using heat, while punctures can be repaired locally using patches.

Regardless of roofing types, timely repairs should follow a roofing inspection if problems are found. Moss Roofing is the roofer to turn to for all your commercial roofing needs. Give us a call at (317) 207-4778 or fill out our contact form. We serve customers in Noblesville and Indianapolis, IN.

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