Tag Archives: why is my roof dirty

The Dangers of Cleaning your Roof with Bleach

Chlorine Bleach has an intense chemical odor.  The toxic fumes can drift as far as a full block away exposing your neighbors to the potent, highly irritating and corrosive fumes as well.

NEVER LET ANYONE USE BLEACH ON YOUR ROOF!  Many contractors use bleach when they clean a roof, mainly because they like the chemical’s low price tag.  Despite being toxic and dangerous for landscaping and pets, chlorine bleach doesn’t actually work as a roof cleaning agent.  It will EVENTUALLY kill the moss growing on your roof, but it does not penetrate into the shingles deeply enough to kill algae and lichen in order to remove black streaks.  It will, however, corrode your roof fixtures such as flashings, underlaymet, valleys and boots (pipe collars).

“Chlorine gas can be recognized by its pungent, irritating odor, which is like the odor of bleach.  The strong smell may provide adequate warning to people that they are exposed.  When chlorine gas comes into contact with moist tissues such as the eyes, throat and lungs, an acid is produced that can damage these tissues.”

– Center for Disease Control and Prevention


How Will I Know if a Roof Cleaning Contractor is Planning on Using Bleach on my Roof?

If a contractor DOES NOT TELL YOU UP FRONT that they are NOT using bleach, then they are probably using bleach.  Roof cleaning contractors who use bleach often don’t advertise or tell you that they are using bleach, mainly because they know that YOU DON’T WANT THEM TO USE BLEACH!  Even when asked about it directly, some may still deny that they use bleach.  Be insistent “Soft Wash” to evade the question.  Here are some other clues that your contractor is using bleach, but won’t say so directly:

  • If they tell you that they follow the shingle manufacturers (ARMA) recommendations, they are using bleach (shingle manufacturers wan’t you to need new shingles!).
  • If they tell you they use sodium hypochlorite (or SH for short), they are using BLEACH bleach.
  • If they tell you they will water down, cover or spray your plants during the process, they are using bleach.
  • If they tell you that they use a runoff recovery system to suck up the chemicals running off the roof, they are using bleach.
  • If they tell you their “soaps” breakdown into salt, they are using bleach.  (Click HERE to see how salt damages landscaping).
Many roof cleaning contractors who use chlorine bleach will mix up their own homemade chemical “cocktails”.  They mix chlorine bleach with an array of various chemicals such as phosphates, dish detergents, laundry detergents, assorted surfactants and ODOR-MASKING AGENTS to HIDE THE SMELL OF BLEACH FROM YOU! But can you guess what the main ingredient is?  BLEACH!  These haphazard chemical concoctions (and the contractors who make and use them!) force one to question product reliability, stability and consistency of not just their mutant chemical solution, but their entire service.

Call CKG Contractors Inc. today for your free estimate for an eco-friendly, bleach-less Roof Shampoo®!



What are those ugly stains on my roof? Can I get rid of them without replacing my roof?

What are those ugly stains on my roof?  Can I get rid of them without replacing my roof?

Yes!  All you need is Roof Shampoo! Most roof stains are caused by the growth of one of the following organisms: Algae, which can harbor a number of molds Lichen Colonies, which are a fungus or Moss, which can keep your roof from drying normally. These organisms feed on the organic material frequently found in… Continue Reading