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Internet # 100598510

Model # 100099149

Store SKU # 951817

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54 oz. 1,000 sq. ft. Roof and Walkway Moss Killer Concentrate

$41.96
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  • Fast-acting moss killer formula
  • Can be used for moss removal on roofs, decks and more
  • Covers up to 1,000 sq. ft.
  • View More Details

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Product Details

About This Product

For best results, apply Lilly Miller's Moss Out For Roofs and Structures just prior to the time when fall rains begin or in early spring. Moss growth can occur in nearly any location where dampness persists. Such areas include roofs, decks, steps, patios, walks, fence posts, and foundations. Since moisture is essential, most moss growth appears during the fall, some in the winter and in the spring. Very little moss forms in summertime. Destroying existing moss is done most effectively during times when its growth is most rapid and when rain is not expected for several days. Controlling moss may add months, or years, of service to roofs, patios and such areas.

Highlights

Product Information

Internet # 100598510

Model # 100099149

Store SKU # 951817

Additional Resources

Shop All Moss Out!

Specifications

Dimensions

Container Size (oz.)

54 oz

Product Size

1 IN-Inches

Product Width (in.)

5.125 in

Details

Application Type

Spray

Area of Use

Driveway, Garden, Landscape Bed, Lawn, Patio

Compatible Grass Type

All Purpose

Concentrated or Ready to Use

Ready to use

Emergent Type

Post-Emergent

Organic

Non-Organic

Pack Size

1

Returnable

90-Day

Safe For

Safe For Kids, Safe For Pets

Safe for Edibles

No

Spray Application Type

Concentrate

Total Coverage Area (sq. ft.)

1000

Weed Type

Moss

Questions & Answers

Can you adjust the spray nozzle to wide or narrow?
BySep 30, 2026
1 Answer | 
Answer This Question

Hi! The spray nozzle on Moss Out! Roofs & Walks Ready-To-Spray is not adjustable between a wide and narrow spray pattern. It is designed to apply the product using its preset spray pattern. Thank you for your question!

By|Oct 1, 2026


    Why does this turn my roof white after drying?
    ByJul 23, 2026
    1 Answer | 
    Answer This Question

    Thank you for your question. A temporary white residue may be visible after the product dries, depending on the application rate, surface type, and environmental conditions. This residue is generally cosmetic and should weather away over time with normal exposure to rain and the elements. If you have additional questions or would like to discuss your application, please contact our Customer Service team at 1-800-265-0761. We're happy to help!

    By|Oct 6, 2026

      (1)

      Does this contain bleach and can you use it with a power washer?
      ByJul 19, 2026
      1 Answer | 
      Answer This Question

      No. Moss Out! Roof & Walkway Moss Killer Concentrate does not contain bleach (sodium hypochlorite).

      By|Oct 6, 2026

        (1)

        Can Moss Out be used on stucco walls and not damage or discolor the exterior painted surfaces?
        ByJun 25, 2026
        1 Answer | 
        Answer This Question

        Hi Mike- Yes. This product can be used on stucco surfaces, and the label states that its non-staining formula will not stain stucco when used as directed. However, because painted surfaces can vary in finish and condition, we recommend testing the product on a small, inconspicuous area first before treating the entire surface. Also, avoid overspray onto desirable plants and rinse any accidental contact promptly. If you have any questions, please give us a call at 1-800-265-0761 if you have any questions.

        By|Jun 25, 2026


          What are the ingredients
          ByJun 10, 2026
          1 Answer | 
          Answer This Question

          Thank you for reaching out. The active ingredient in Moss Out! Roof and Walkway Moss Killer Concentrate is ammoniated soap of fatty acids (22%). This ingredient works by drying out and killing moss and algae on roofs, walkways, decks, patios, and other outdoor surfaces. If you need additional information, please refer to the Safety Data Sheet (SDS) or complete product specifications, please let us know and we'd be happy to assist further.

          By|Jun 10, 2026


            Is this product safe to use on lava rocks under trees without hurting the tree?
            ByMay 17, 2026
            1 Answer | 
            Answer This Question

            Hi Connie- It is recommended for use on structural surfaces such as roofs, decks, patios, and walks, not directly on trees or other plants. Please give us a call at 1-800-265-0761 if you wish to speak to us.

            By|May 19, 2026


              Is moss out safe to use on asphalt driveways?
              ByApr 15, 2026
              1 Answer | 
              Answer This Question

              Yes, Moss Out! Roofs & Walks can be used on asphalt driveways to control moss and algae. The product is designed for use on various structural surfaces, including asphalt, and its non-staining formula does not stain concrete, pavement, stucco, or wood.

              By|Oct 6, 2026

                (1)

                Is product pet safe
                ByMar 26, 2026
                1 Answer | 
                Answer This Question

                Hi Sparky — please do not let pets into the treated areas until the dusts and sprays have dried or settled.

                By|Mar 27, 2026


                  Viewing 1-8 of 60

                  Customer Reviews

                  3.2 out of 5

                  • 3.2 out of 300 reviews
                  • 62% recommend this product
                  Filter by:
                  Showing 1-10 of 300 reviews
                  I've found that this is what actually really worked for killing the moss of my wall. I usually take a pressure washer and a broom and knock off all the loose moss first. Then after spraying the moss killer on my wall and waiting about a week I'll come back through when the moss has turned brown and brush off the rest of it. I have to do this about once a year but that's pretty good compared to any other products I've tried. Id recommend doing this late spring early summer when the moss is most prominent. This is what works for me.
                  by
                  Moss out for roofs works really good, easy to use with a garden hose sprayer. I wish the product was available in a larger quantity since it is used up fairly quickly at 8oz per gallon of water.
                  by
                  1 found this review helpful
                  Hit or Miss! (20-80%) For me anyway
                  Unlike moss out lawn, this one didnt work this time. Used a decade ago and it worked really well, so bought some more and very disappointed, so far. In fairness, done Saturday, but repeated yesterday and still huge areas where the moss is a green and lush as it was on Friday evening! Again coverage much higher than they suggest, which perhaps is an issue with the mixer bottle head that it came with more than product, but I guess at least I have plenty left to go up a 3rd time!!!!!
                  by
                  Response from Moss Out TeamMay 9, 2023
                  Hello, we are sorry to hear about your experience with this product. If you would like to further discuss your experience please contact our Customer Service Department via phone at 1-800-265-0761. mossout
                  • Verified Purchase
                  3 found this review helpful
                  I have fairly heavy moss growth on the side of my house and a discoloration on the front. The fro...
                  I have fairly heavy moss growth on the side of my house and a discoloration on the front. The front faces North and the side West. I sprayed a discolored area on the front and saw no improvement, even though I waited over a week. On the side, the results were better. I sprayed the center block in this picture and you can see the block is brighter and in the bright area there is no discoloration or moss.
                  by
                  • Recommended
                  1 found this review helpful
                  Thought I would get a head start this spring by ordering this early, but spring is really taking ...
                  Thought I would get a head start this spring by ordering this early, but spring is really taking it's time getting here this year, so the moss on my roof hasn't started greening yet. Gonna be a while yet for the optimum time to use this...here's what I've figured out in the meantime... This stuff can be applied anytime, best in spring & fall, when actively growing. It works on moss & algae, not sure about lichen. It does warn in the directions to avoid spray & runoff on desirable plants, so be aware. Some other products on the market don't need this warning. This is a concentrate...6.8 oz per gallon water, 54 oz. bottle. Apply liberally, when moss is moist. Apply when frequent rain expected. If rain within 24 hrs., repeat application. Treats 1000 sq. ft. max. Looking at 2 possible application techniques...tank sprayer, or hose-end sprayer...tank is probably more economical & precise, if you don't mind roof-walking (or if it sprays a distance). There was no price listed at the time the Seeds program provided this, so no idea of “value” rating.
                  by
                  3 found this review helpful
                  Works great, sprays fairly evenly. Good product. Shall see the results soon.
                  by
                  Sprayed mossy area, it turned brown by the next day. A week later it rained, it's already turning green again???
                  by
                  Response from Moss Out TeamOct 14, 2026
                  We're sorry to hear that Moss Out! didn't provide the lasting results you expected. While the browning you noticed indicates that the treatment was affecting the moss, new growth can occur if conditions remain favorable, especially in damp, shaded areas. Once the treated moss has died, removing the dead material can help improve results. We'd be happy to learn more about your application and help troubleshoot. Please contact our customer service team at 1-800-265--0761 for further assistance. Thank you for your feedback! mossout
                  • Verified Purchase
                  This customer chose to rate the product and not provide text.
                  by
                  This product was simple to use. I just attached it to my hose and sprayed my roof. It takes 3 to 5 weeks to work but I can see it killing the moss. I’ve used it a few years ago and it worked great!
                  by
                  It’s easy to use,affordable, and effective. Could see positive results in two days
                  by
                  • Verified Purchase
                  Showing 1-10 of 300 reviews

                  Compare Key Features

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                  Product Snapshot

                  A great choice for homeowners looking for a moss and algae killer, making maintaining roofs, patios, and walkways easier.
                  Ideal for homeowners looking for crabgrass prevention, ensuring a lush, green lawn all season long.
                  Ideal for southern lawns, effectively killing tough weeds while safe for pets once dry.

                  Coverage Area

                  1, 000 sq. ft.
                  5, 000 sq. ft.
                  6, 670 sq. ft.

                  Active Ingredients

                  Zinc Sulfate Monohydrate
                  Atrazine

                  Application Method

                  Sprayer
                  Granular
                  Concentrate, pump sprayer

                  Residual Control

                  Rainproof Protection