Bradly Lewis Home Maintenance Inc   503-481-8872

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Zinc Strips around Portland Oregon

There are several ways to prevent moss. Some people have used zinc strips. I have removed moss from many roofs that have zinc strips installed on the roof line and by shingles.

There are several problems associated with using zinc strips:

  • You have to put a nail nearly vertical through the roof. This makes a hole in the shingles.
  • They are smooth faced. Because of this, they will cup because of the hot/cold cycle in the day and cause rainwater to flow over them nonuniformly. This causes nonuniform effectiveness in roof coverage. Some places it totally allows moss to grow and in certain areas it works for a couple feet below it.
  • They must be installed every 2 - 4 feet from the roof top down to the gutters to have enough runoff concentration to kill or even prevent moss.
  • They only work where the roof receives rainfall (doesn't work under damp sheltered dormer roofs)
  • Many people don't leave enough of the zinc strip exposed to do much good.
  • It breaks up the uniform pattern of shingles on your roof.
    Sweeping action of wind blown branch more effective than zinc strip above
    Wind and branch kept roof clear of moss


    Zinc strips are wavy and cause uneven water flow. The curls on edges hold water. When the water runs down the cupped strip and hits a low spot, it drains out. This is seen here by the clean section below the point where two strips are pieced togeth
    Zinc strip with uneven runoff


    Zinc runoff from galvanized roof jack inhibits moss and mildew growth
    Zinc runoff from galvanized roof jack prevents moss and mildew


    Moss on school roof with zinc strips
    Moss on school roof with zinc strips


    See moss prevention for a better solution.

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    Bradly Lewis Home Maintenance Inc
    Call Anytime  -  Free Quotes  -  503-481-8872
    1501 N Hayden IS DR #21B Portland, OR 97217
    Licensed, Bonded $10K, Insured $1M, CCB#179746
    © 2004 Bradly Lewis
    Moss removal in Portland Oregon