Bleach for Killing Moss on a Roof

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WHY STORE BOUGHT BLEACH ISN’T STRONG ENOUGH TO KILL MOSS

There is a common misconception that bleach can kill moss. Homeowners go into their local supermarket and pick up a jug, pour it on their roofs and wonder why the moss hasn’t died. This information is faulty because, originally, store bought bleach only contained 6% of its weight as Sodium Hypochlorite [A.K.A Bleach].

6% bleachMIXTURES AREN’T ALWAYS SO CLEAR

There are many faulty ehow recipes on how to mix the bleach. By the time you’re done with even a conservative, 1 part bleach to 3 parts water your mixture isn’t strong enough to kill the moss you were after. Mixing household bleach which originally held 94% of its volume as water with even more water makes for a product that is not potent.

Bleach is about $6 a gallon at this time of writing. It takes about 40 gallons of liquid to properly cover an average homes roof.The roof cleaning costs quickly add up.

Let’s take a look at how easy this can be to screw up, and how difficult it can be for an average consumer to properly and correctly clean his roof:

Original Amount of 6% Bleach

Amount of Water

Strength after Dilution

Gallons of mix required for average 1200 Square foot home

Gallons Total:

1 gallon

33%

4%

40

Bleach: 30 g

   H2O: 10g

You now need a surfactant (something to stop the mix from rapidly flowing into your gutters), Dawn* soap or any surfactant able to mix without causing a reaction to bleach, work well. This is a surfactant that works well with bleach and doesn’t take away from its shelf life.

The mix above is a standard mix roof cleaners use to kill moss. Many times depending on the bleaches shelf life, the mixtures need to be adjusted. Bleach is a very volatile solution that loses its strength quickly and doesn’t handle well with a whole host of surfactants. Mixing the wrong surfactant can be wasteful and leave you with a mixture that doesn’t do what it was supposed to which is to:

  • Kill Moss.
  • Remove Stains.
  • Not Damage the roof it is applied to.

We’ve covered everything except how to get 40 gallons of liquid onto your roof ……. [Continued shortly in: pumps for roof cleaning]

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