Chlorine should be the safest chemical on earth-Starts as salt and ends up as salt. Right?
They claim the sodium hypochlorite heats up it disperses as a gas and that gas harms the ozone. I say show me proof.
Here is owens corning recommended roof cleaning method.
CAUSES
Algae growth causes a dark discoloration on roofs. The algae is usually brown to black in color which results in a streaked, dirty looking rooftop. It can be mistaken for soot, dirt or tree droppings, which typically produce only localized discoloration. It's caused by the growth of air-borne algae which deposits on your roof. The good news is that algae growth does not affect the service life of your roofing material. It occurs most often in warm, humid climates such as the Southeast (where algae-resistant shingles are available).
RECOMMENDATIONS
Discoloration of roofs caused by fungus or algae is difficult to remove, but may be lightened by spraying a diluted solution of chlorine bleach, trisodium phosphate, and water onto the roof. Solutions range from one cup TSP, one gallon bleach and four gallons of water, to one cup TSP and 2.5 gallons each of bleach and water. This solution can then be rinsed from the roof in 10 to 15 minutes. Do not scrub. Scrubbing will loosen and remove granules. After spraying be sure to thoroughly flush the roof and the greenery around the home (grass, bushes and shrubs) with water. The effectiveness of this type of cleaning may only be temporary, and the discoloration may recur. High pressure washing is not recommended due to the possibility of removing granules, thereby shortening the life of the Roofing System.
For a more permanent solution, re-roof with Owens Corning Algae-Resistant Shingles. They are specifically designed to inhibit most algae growth for extended periods of time and are backed by our strongest product and algae resistance warranties* available to homeowners.
*See actual Algae-Resistant shingle warranty for details. Algae-Resistant products are not available in all areas. Contact your local Owens Corning supplier for more informatio
They claim the sodium hypochlorite heats up it disperses as a gas and that gas harms the ozone. I say show me proof.
Ok, I went out to give the home owner, that was asking all the questions about bleach, an estimate for the roof cleaning. I had my information,that Russ armed me with,and had a nice conversation with the home owner. After we talked she read the recomendations and knew she was lied to from the Roof shampoo guy and called him on the phone while I was there. Well he called me a fly by nighter. She called him a lier and we are cleaning that roof in a week or so! Nice size roof I might add. Thanks for all the info guys.
The Roof shampoo guys are putting signs up all over town saying NO BLEACH roof cleaning. I feel like ripping them down.
Here is some more Roof Cleaning Recall Information if you scroll down the page. There are 2 roof cleaning recall and danger links that should scare the chit out of any customer. If you suspect that the product you are up against contains Sodium Hydroxide, look your customer in the eye and say "You don't want LYE and pressure used on your roof, do you" ? Then, show them a Sodium Hydroxide MSDS Sheet about causing severe burns, tell them how it will burn the feet of their grandkids and Pets, and suck the oil right out of their asphalt, since it is a degreaSER. Show them Sodium Hydroxide is used in paint strippers, and it is. Tell them as the rinsed off sodium hydroxide runs down their walls, it will soften the paint.Ok, I went out to give the home owner, that was asking all the questions about bleach, an estimate for the roof cleaning. I had my information,that Russ armed me with,and had a nice conversation with the home owner. After we talked she read the recomendations and knew she was lied to from the Roof shampoo guy and called him on the phone while I was there. Well he called me a fly by nighter. She called him a lier and we are cleaning that roof in a week or so! Nice size roof I might add. Thanks for all the info guys.
The Roof shampoo guys are putting signs up all over town saying NO BLEACH roof cleaning. I feel like ripping them down.
Sorry Thanks for the adviceI'm the Rodney Dangerfield of PWI.