Moss-B-Ware 3 lbs. 3,000 sq. ft. Roof, Patio and Walkway Moss Killer Powder

Overall, I’m satisfied with the results in a relatively short amount of time. It is a fine powder (like all-purpose flour) that sticks to where you want it, but can’t be applied on windy days unless you mix it with water and spray it on. I haven’t noticed any runoff harm to nearby vegetation.

This moss killer works great on my roof. I prefer the powder form in Moss B Ware to more granular other products. It sticks to the roof surface rather than just rolling off. I’ve used this product in the past and expect that it will kill the moss again this year.

Both canisters had lids fall off during transit and left me with powder all over the box which I accidentally brought inside my home. I spent over an hour cleaning up this toxic mess. Otherwise a good item. Just buy it at the store and safely transport it at your own discretion.

I sprinkled this product on some moss on the soil surface near an ornamental tree. Now the tree leaves are drooping and I fear it will die. How do I save my tree???

I sprinkled this product on some moss on the soil surface near an ornamental tree. Now the tree leaves are drooping and I fear it will die. How do I save my tree???

If you live in the NW where cool wet lingering weather promotes a cornucopia of algae, mosses, lichens, fungus' and molds - most of which grow abundantly on any and all surfaces...especially roofs, you need a way to get rid of it. These can damage shingles and retain water over time. Enter Corry's Moss-B-Ware. This is concentrated powder - not liquid. This has an advantage over the liquid forms....firstly you can see it. Liquid you cannot. You know exactly where it lands and where you need more or less of the powder. Next, the powder is very fine and stays in place after landing. Lastly, if there is a need for liquid application, simply mix some of the powder with water and apply (like in hard to reach places and you you wish to spray it into place. This tends to be much cheaper than the other brands that are in liquid form which is mainly water. To apply: before starting, look for a non-windy and rainy day. I like to apply the product to a damp roof to make the powder stick. I have a powered leaf blower and clear most debris first (roof, gutters, and between stacks and flashing. For moss that has grown a crown of green popping up from the edge of a shingle, I take a stiff brush or push broom and knock most of these crowns off. This leaves the "roots" which extend under the shingles. Beginning at the peak of the roof I shake out powder low down close to the shingles (as the powder is fine, even small air currents will make it drift from where you want it). I cross horizontally all the way across the roof then drop about 2 linear feet and repeat across the roof. NOTE: When applying, never walk backwards or backup lest you fall! Follow all instructions. A can covers roughly 600 square feet (I needed two for my roof). Moss B Ware products will not stain roofs or corrode aluminum and galvanized gutters, when used as directed. If applied from this shaker container, no other equipment is necessary. Pitched roofs that can be walked upon, such as composition, wood shingles, or shakes can most easily be treated by shaking the Moss B Ware granules directly from the container along the ridge of the roof. Rains then wash the Moss B Ware product down through lower moss patches. For roofs you cannot walk on, mix up and spray surface. After the moss dies, brush away any remaining moss. If there is any moss hanging on, place some additional powder directly onto the moss.

We have used this product for many years with excellent results.

Good product. Easy to use and gives a good range of area on the roof. Kills moss every time we use it.