Flat Roofing.
Where Water Has Nowhere to Hide.

Low-slope and flat roof systems for additions, porches, and outbuildings — built so standing water never becomes a structural problem.

Parker the Panther, the 4P Roofing mascot, waving

Flat Roofs Fail Differently

A flat or low-slope roof doesn't shed water the way a pitched roof does, so the margin for error is smaller. Poor drainage, bad seams, or the wrong material for the slope is how a flat roof ends up with standing water and, eventually, a leak that shows up somewhere completely different than where the water actually got in.

We install and repair low-slope systems for additions, porches, carports, and outbuildings with proper drainage planning and sealed seams from the start — not something that gets figured out after the first pooling water shows up.

01Drainage Planning

Proper slope and drainage so water actually moves off the roof instead of pooling.

02Sealed Seams

Every seam and edge properly sealed — the most common place a flat roof fails first.

03Right Material for the Slope

The right low-slope system for your specific roof, not a one-size-fits-all approach.

Flat Roof Materials We Use

Flat roofs use different materials than shingle roofs. We work with three of the most proven low-slope systems and help you choose the one that fits your roof's size, slope, and budget.

  • Flintlastic peel-and-stick. A self-adhered, modified bitumen system. The layers stick down without an open flame, which makes it a good fit for porches, additions, and smaller roofs with a lot of detail work. A granulated top layer protects it from the sun, and the overlapping seams are sealed.
  • TPO. A single-ply white membrane. TPO reflects heat instead of absorbing it, which can help with cooling costs, and its seams are heat-welded into one continuous waterproof surface.
  • EPDM. A rubber membrane with a long track record. EPDM stays flexible through hot and cold swings and holds up well to weather. It's typically black, and its seams are taped or glued, so careful installation matters.

At a Glance

Flintlastic Peel-and-StickTPOEPDM
What it isSelf-adhered modified bitumenSingle-ply white membraneSingle-ply rubber membrane
SeamsOverlapped and sealedHeat-weldedTaped or glued
HeatGranulated surfaceReflects heatUsually black
Often used forPorches, additions, and detailed smaller roofsRoofs where energy efficiency mattersRoofs that need a flexible, proven membrane

Proper Flashing for Flat Roofs

On a flat roof, the flashing is where most leaks start. The flat surface itself is only part of the system, and every place the roof meets something else needs to be sealed correctly.

  • Walls and curbs, where the roof runs up against a vertical surface
  • Pipes, vents, and other penetrations that come through the roof
  • Edges and drip edge, so water runs off cleanly instead of getting underneath
  • Drains, scuppers, and gutters, where water leaves the roof
  • Transitions, where a flat roof ties into a shingle roof or another section

We flash every one of these details for the material we're installing, and we don't rely on caulk alone to do a flashing's job.

Common Flat Roof Problems

Signs you might need a repair or a new flat roof:

  • Standing water that doesn't drain within 48 hours
  • Bubbling or blistering in the roofing material
  • Cracked or separated seams
  • A leak on a porch, carport, or addition roof
  • Visible sagging in the roof deck
  • An outbuilding roof that's never been inspected

Got a Flat Roof Problem?

Let's take a look — your inspection is always free. No pressure, no obligation.

Schedule My Free Inspection