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Internet #100004640

Model #NMM50

Store SKU #430703

2.67 in. x 50 ft. Zinc Moss and Mildew Preventer Strip

$4064
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  • Provides long-lasting protection against moss and mildew
  • Installs easily near roof ridge
  • For use with shingle, shake, or tile roofs
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Price:
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Product Overview

The GAF Master Flow Zinc Moss Preventer is used for long lasting protection against moss and fungus. Zinc Moss and Mildew Preventer installs easily near the roof ridge. It can be used with composite, shake or tile roofs and is EPA approved.
  • Helps prevent the growth of mold and mildew near the roof
  • For use with composition (shingle), shake or tile roofing
  • For long-lasting protection against moss and fungus
  • Installs easily near the roof ridge
  • EPA approved
  • With each rain, zinc is released from the strip and prevents the growth of moss below the strip



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Typical questions asked about products:

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Customer Reviews

  • 4.2
    out of 65 reviews
  • 84%recommend this product
Filter by:
Showing 1-10 of 65 reviews
Very easy to install
Installed under the ridge tiles on moss covered barn roof. It appears to have an immediate effect on eliminating the moss growth, but will have to have more rainy days to determine the total benefits. It's alot easier than trying to balance some 5 gals buckets of bleach on the roof ridge.
by
  • DIY
  • Verified Purchase
  • Recommended
12 found this review helpful
Purchased because famous DIY TV show recommendations
In past years my roof had algae /moss issues. First purchased a product that user sprays (blue bottle - W_t and F_rget) on the roof and it kills the algae moss. Then the rain would knock dead moss /algae off. However, depending on the size of the algae /moss it takes a long time. On neighbors' application I did the same as above but used a semi-hard nylon brush to 'help' algae /moss off. I then applied Master Flow Zinc strip. Directions on a pdf at the website (as an alternative to nails) using HD Construction Adhesive can be used to adhere zinc strip to roof. My neighbors' asphalt shingles are not new, and I didn't want to use a hammer and nails, possible damage present shingles (bending up present shingles to nail strip). It is also recommended to use neoprene washers between nails and present shingles or whatever roofing material you have. Application was August 2022, results of how well the zinc strip does its job is too soon to tell.
by
Response from Master FlowAug 31, 2022
Thank you for the feedback on your Master Flow purchase. MasterFlow
  • Verified Purchase
  • Recommended
1 found this review helpful
Would be nice to have predrilled mounting holes...
Would be nice to have predrilled mounting holes
by
Response from Master FlowSep 14, 2022
Thanks for the feedback and your concerns. Glad you were satisfied with your Master Flow purchase. MasterFlow
  • Verified Purchase
Product works well for my purpose...
Product works well for my purpose
by
Response from Master FlowMar 17, 2022
Thanks for the feedback. Glad you were satisfied with your Master Flow purchase. MasterFlow
  • Verified Purchase
1 found this review helpful
by
    Mold Mildew Preventer
    The roofers put it on and hopefully over the years it will kept the mold off.
    by
    Response from Master FlowOct 5, 2022
    Thank you for the feedback. Glad you were satisfied with your Master Flow purchase. MasterFlow
    • Verified Purchase
    • Recommended
    Took over two weeks to get it....
    Took over two weeks to get it.
    by
      by
      • Verified Purchase
      Had new roof installed. heat & storms have hindered...
      Had new roof installed. heat & storms have hindered application
      by
      Response from Master FlowApr 27, 2022
      Sorry for your experience. This is not a common issue for this product. Thank you for your feedback. MasterFlow
      • Verified Purchase
      Moss preventer - not
      I spent a couple hundred dollars on this product to help prevent recurring moss on my clean comp shingle roof. I installed exactly as per instructions and removed the existing moss first. After a couple of Calif rainstorms, it seems as if the moss grew faster. Better off by sprinkling moss killer on the roof...
      by
        1 found this review helpful
        Showing 1-10 of 65 reviews