I'm quoting a roof cleaning job for a clay tile roof. The roof appears normal but the customer has advised that some years ago it was pressure washed and sealed with a chemical called B66. Should this be an issue when cleaning?
Here is a link to the chemical - http://www.scl.co.tt/Assets/spec-crete%20superseal%20b66%20revised%20.pdf
Paul, I think the pictures tell a pretty good story. The sealer appears to still be effective in some areas, and weathered away in others. I wouldn't be concerned with the sealer at all. Softwash the entire roof and what's covered in fungus will come clean. Reading the info. on the sealer, I don't see anything that leads me to believe you could possibly cause any harm.
As a precaution, do a test on the tile before you take on the project.
Paul Low Chew Tung said
May 19, 2015
Great answer! Thanks Bob!
AC Lockyer said
May 23, 2015
The sealer appears to be for floors. There is a good likelihood that where there is still sealer that there may be some reaction to the bleach that may cause some flaking of the sealer from the surface. THOUGH I believe you will be OK and there is only about a 10% chance of this being an issue.
Hey guys,
I'm quoting a roof cleaning job for a clay tile roof. The roof appears normal but the customer has advised that some years ago it was pressure washed and sealed with a chemical called B66. Should this be an issue when cleaning?
Here is a link to the chemical - http://www.scl.co.tt/Assets/spec-crete%20superseal%20b66%20revised%20.pdf
See pics.
Thanks in advance!
Paul, I think the pictures tell a pretty good story. The sealer appears to still be effective in some areas, and weathered away in others. I wouldn't be concerned with the sealer at all. Softwash the entire roof and what's covered in fungus will come clean. Reading the info. on the sealer, I don't see anything that leads me to believe you could possibly cause any harm.
As a precaution, do a test on the tile before you take on the project.
AC