How to Bleach Roof Shingles

People generally bleach shingles when they are trying to kill mold and mildew, but you can also bleach shingles to get an even color and tone across the entire roof.
Always bleach shingles on an overcast day for best results.

Step 1

Mix a bleach solution in the pump sprayer by combining 1 quart of bleach, 1/4 cup of TSP and 1 gallon of water. Swirl the container to mix the ingredients but do not shake them.

Step 2

Wet down all plants next to the house with a garden hose and cover with tarps to protect them from the bleach. Put on slip-proof shoes before heading up the ladder.

Step 3

Spray the roof with your bleach solution, covering all the shingles. Wait 15 minutes before moving on. If the solution appears to be drying on the roof, reapply in the middle of the 15 minutes.

Step 4

Wash down the roof with the garden hose. Use plenty of water and the highest pressure possible. Your shingles should be brighter and cleaner than before.

Things You Will Need

  • Slip-proof shoes
  • Tarps
  • Garden hose
  • Ladder
  • Pump sprayer
  • Bleach
  • TSP

Tip

  • Oxygen bleach is gentler on shingles but also gentler on stains. If you bleach frequently, oxygen bleach is a better alternative.

Warning

  • Bleach can damage some types of shingles, particularly asphalt. Check with the manufacturer before bleaching to ensure the shingles are not prone to bleach damage.