Flat and low-slope roofs are everywhere in Tucson, from mid-century ranch homes to Santa Fe and Pueblo Revival styles. They are not truly flat; they rely on gentle slopes to move water to scuppers or drains. When that path is blocked or the surface fails, water finds a way in.
Where flat roofs usually leak
- Scuppers and canales that are clogged or poorly sealed where they pass through the parapet.
- Parapet caps and stucco, where cracks let water run down inside the wall.
- Ponding in low spots that wears out the surface faster.
- Curbs under evaporative coolers and AC units.
- Old built-up or rolled roofing that has blistered or split at seams.
Things you can safely do
From the ground or a window, check that scuppers are not blocked and note where water drips inside. Take photos. Leave roof walking, especially on wet or foam surfaces, to a roofer.
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Questions
Why does water stain the wall instead of the ceiling?
With parapet roofs, water often enters at the parapet cap or scupper and runs down inside the wall.
Is foam or a membrane better for a flat roof?
Both are used in Tucson. A roofer can explain the tradeoffs for your roof's condition and budget.