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Homeowner guide

Snow on Flat Roofs

Flat roofs hold snow. That's normal, but it brings drift loads, slow melt and frozen drains to watch for.

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Shallow water standing across a flat roof along a parapet wall, draining slowly toward a partly blocked scupper
Standing water near a scupper.

What to watch for

  • Drifts against parapets and higher walls
  • Slow melt in shaded areas
  • Frozen scuppers and drains that trap meltwater
  • Freeze-thaw cracking at seams, corners and edges

Before winter

  1. Clear scuppers, drains and gutters
  2. Seal cracks and open seams
  3. Fix low spots or coat them with silicone
  4. Check that the roof slopes to drains
White roof coating applied up and over a skylight curb and around a vent cap on a flat roof
A skylight curb sealed into the coat.

During heavy snow

Most flat roofs are designed for local snow loads. If you see sagging, doors that stick suddenly, or cracking sounds, call a professional. If snow must be removed, use plastic shovels, leave a few inches, and stay away from edges.

After snow season

A spring inspection catches damage before summer storms. See flat roof inspections.

Snowmelt leak? Call (505) 257-2289.

Common questions

Should I shovel my flat roof?

Usually not necessary. If needed, do it carefully or hire it out.

Why do leaks appear days after snow?

Meltwater finds cracks, refreezes and opens them over several cycles.

Keep reading

Need help with your roof?

Free estimates in Los Alamos and White Rock.

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