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I have done a couple of slate roofs..10-12 The only thing I know is make sure the tank is rinsed real good before you mix. You want to have no alcohol in the tank or new mix. It's poaaible the alcohol can discolor the slate for a period of time. I have not had a problem with any of them they come out perfect! No worries on your end, good luck,

Roof Cleaning Long Island N.Y 516-763-4108 wrote:

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I have done a couple of slate roofs..10-12 The only thing I know is make sure the tank is rinsed real good before you mix. You want to have no alcohol in the tank or new mix. It's poaaible the alcohol can discolor the slate for a period of time. I have not had a problem with any of them they come out perfect! No worries on your end, good luck,

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 Heard that! About the penatrant. Sames goes with the surficant as well. You chime in the same so far, bout the achol! Thanks for your help!

This a real important job and thanks!!!

 

Mike it couldn't be easier...

unless your pump can't hit from the roofline.

I did this one all from standing on the ground hitting 30ft up with nothing more than 1/3 15% SH (5% total chlorine) and dawn. Temps were 95+ degrees but worked mostly in one pass w/7gpm pentaflex.

Tested SH alone didn't do deeeck.  Added Dawn, BAM!  Though I did rinse away the discoloration left by the soap but that didnt take much time at all.  Would of left it but no rain in forecast for weeks.  If its gonna rain soon leave it big momma nature.

 

-- Edited by Maverick Contracting on Thursday 8th of September 2011 09:55:35 AM