Low Slope & Flat Roofing in Bloomington-Normal, IL

Low slope and flat roofing systems require specialized materials and installation techniques that differ significantly from steep-slope asphalt shingles. RoofSmith has the experience and product knowledge to install and maintain low slope systems that hold up under Central Illinois conditions — including standing water, freeze-thaw cycles, and heavy snow.



We serve residential and light commercial properties throughout Bloomington, Normal, Hudson, Carlock, Downs, and LeRoy.

Low Slope Roofing Systems We Install

Modified Bitumen: A durable asphalt-based membrane applied in layers, providing excellent waterproofing performance for residential and commercial low-slope roofs.

TPO (Thermoplastic Polyolefin): A single-ply membrane known for energy efficiency and heat-weldable seams. Excellent UV resistance.

EPDM (Rubber Roofing): A highly durable synthetic rubber membrane well-suited to cold climates and large flat areas.

Signs Your Low Slope Roof Needs Attention

  • Ponding water that doesn't drain within 48 hours after rain
  • Visible bubbles, blisters, or seam separations in the membrane
  • Interior water stains below a flat or low-pitch roof area
  • Cracked or deteriorated flashing at walls, skylights, or penetrations

Frequently Asked Questions — Low Slope Roofing

  • What is the difference between a flat roof and a low slope roof?

    A flat roof has a pitch of less than 1/4 inch per foot — essentially level. A low slope roof has a pitch between 1/4 and 2 inches per foot. Both require waterproofing membranes rather than standard shingles. RoofSmith installs appropriate systems for both.

  • How long does a flat or low slope roof last?

    Depending on the system, low slope roofs typically last 15–30 years. Modified bitumen and TPO membranes are at the higher end. Proper installation and regular maintenance are the most important factors in longevity.

  • Can a low slope roof be converted to a steeper pitch?

    In some cases a structural retrofit is possible, but it is a significant construction project. Most homeowners find that a properly specified and installed low slope system is the most practical and cost-effective solution. RoofSmith can walk you through your options.