Yes you can.
However, the standard serpentine patterns designed to create water-drainage channels in forming ice don’t really apply to flat roofs, because we don’t have the same directional gravity pulling the water down like we do on a sloped roof.
Each heat tape application on a flat roof can differ based on many factors. The best way to determine a heat tape solution for your flat roof is to contact us, and we’ll help design a configuration that fits the best for your needs. Not only are we Ice Dam and Heat Tape experts, we know a lot about flat and rubber roofs from our sister roofing company in Minneapolis, MN.