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Homeowner guide

Pine Needles and Your Roof

Ponderosa pines are part of what makes Los Alamos beautiful. Their needles are also one of the biggest maintenance issues for roofs here.

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Rusty metal scupper sticking out of a stucco wall with a crack above it and dark water stains running down the wall
A leaking scupper staining the wall.

What needles do

  • Pack scuppers, drains and gutters so water backs up
  • Hold moisture against the roof surface
  • Collect in valleys and behind chimneys, slowing drainage
  • Freeze into ice in winter, adding to ice dams
  • Create fuel for embers during fire season

Maintenance schedule

  1. Late spring — clear the roof, valleys, gutters and scuppers before fire season and summer storms
  2. Fall — clear again before snow
  3. After windstorms — check drains and valleys
Worker pressure washing grime and old coating off a flat roof next to a vent and stucco parapet
Cleaning a flat roof before coating.

Help for gutters

Gutter guards can reduce needle buildup, but pine needles can still sit on top of some designs. Pick a style that works for needles, and expect occasional cleaning.

Trimming trees

Keeping branches trimmed back from the roof reduces needle fall and fire risk. Use a qualified tree service for large trees.

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Common questions

Is it safe to blow needles off my roof?

Only if you can work safely on the roof. Otherwise, have it done.

Do needles damage coatings?

Not directly, but trapped moisture and clogged drains shorten coating life.

Keep reading

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