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  1. #1
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    Need advice on cleaning oxidation off a metal roof to prep for repainting

    The job is a large Charlie's Chicken restaurant with a metal roof. It is heavily oxidized but otherwise in good shape.
    I need to pressure wash it to prep for repainting.


    My plan was to use a boom lift, a turbo nozzle, and time.


    My equipment is a hot water, 8gpm, 3500 psi skid. I didn't plan on using chems or hot water. I just planned on blasting the oxidation off with some up close and personal love from my turbo nozzle.


    I need advice.
    Is my plan on target or do I need to rethink it? I also need advice on pricing this job. The owner is a close personal friend so walking away is not an option. I'm including a picture but it doesn't show some of the headaches I'll be dealing with. There are some neon lights and security cameras I will have to work around. Since I'll be in a boom lift I wondered about using my 19" WW classic surface cleaner. Has anyone ever tried it?


    Remember, I'm prepping for a painter to come behind me. I'm not worried about making it sparkle when I'm done. My job is to remove the oxidation, clean off all the bird crap, and clean the black off the roof around the vent hoods.


    Anything helps.
    Thanks
    Attached Images Attached Images

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  • #2
    Member Senior Undergraduate AquaMike's Avatar
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    Does it need painting or does it actually just need cleaning?
    Mike Woolley

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  • #3
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    Quote Originally Posted by AquaMike View Post
    Does it need painting or does it actually just need cleaning?
    It needs to be repainted bad. That picture is old. It has heavy oxidation in it. The owner has been planning it for a couple years. The only actual cleaning is around the vent hoods and bird crap. The main goal is to remove the oxidation.

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  • #4
    Member 7000 PLUS POSTER Doug Rucker's Avatar
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    If I were you I would tell the owner to have the painter do his own prep work. Especially if he's a good friend of yours. If you've never done this before, this is not a good job to cut your teeth on. Think about not letting your friendship get strained over this. Ask your friend if once he finds the painter you can watch how they prep and remove the oxidation for painting.
    Doug Rucker-Call or text 281.883.8470
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  • #5
    Member Honorary Professor DunRite's Avatar
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    Why the Turbo nozzle? - I would think you may etch the metal if your not super careful

    An 8 GPM machine with a 40 degree nozzle should do it i would think

  • #6
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    Quote Originally Posted by Doug Rucker View Post
    If I were you I would tell the owner to have the painter do his own prep work. Especially if he's a good friend of yours. If you've never done this before, this is not a good job to cut your teeth on. Think about not letting your friendship get strained over this. Ask your friend if once he finds the painter you can watch how they prep and remove the oxidation for painting.
    The painter doesn't have a machine that will hold up to the task. The painter is a friend of the owner too. I have experience with roofs just not metal roof oxidation removal. Everyone keeps telling me to walk away. I just need advice on methods.

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  • #7
    Member 2000 PLUS POSTER tomtucson's Avatar
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    If its the paint thats oxidized I would use chems, maybe a caustic soap and let that do all the work, then rinse and done.
    Tom Cusick
    Liquid Heat
    Tucson Arizona 520-247-3944

  • #8
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    Quote Originally Posted by tomtucson View Post
    If its the paint thats oxidized I would use chems, maybe a caustic soap and let that do all the work, then rinse and done.
    I wondered about a strong mix of sodium hydroxide and heavy snot through my roof pump. I just wasn't sure the caustic would get the job done on the oxidation. That's the kind of advice I'm looking for, thanks.

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  • #9
    Member Senior Undergraduate AquaMike's Avatar
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    Personally......I'd 2 step it but use a high ph soap as the second step. You'll see all the chalky paint turn bright again. I agree that it's probably not a good practice job for you though. If you don't do it right the paint won't stick then your buddy is mad at you and the painter!
    Mike Woolley

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  • #10
    Member 7000 PLUS POSTER Doug Rucker's Avatar
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    Quote Originally Posted by Trainerboy View Post
    The painter doesn't have a machine that will hold up to the task. The painter is a friend of the owner too. I have experience with roofs just not metal roof oxidation removal. Everyone keeps telling me to walk away. I just need advice on methods.
    There's so many variables to this than just methods....methods minus the experience equals disaster sometimes.
    Doug Rucker-Call or text 281.883.8470
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  • #11
    Member Honorary Professor JDhomeservices's Avatar
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    What if a roof just needs oxidization removed, not painting. My church just added an extension, and the new metal green Roof looks bright and shiny, while the old section looks dull and dark.

    Sent from my DROID RAZR using Tapatalk

    JOSH DAVIS
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  • #12
    Member 3000 PLUS POSTER Paul Kassander's Avatar
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    A good alkaline detergent works well if you rinse properly the paint will stick very well (assuming the painter uses the correct paint)> it is important to remove all the grease and oils from the surface as well as any organic matter such as sap, moss,mildew etc. Two step would be the best method in my experience as it both cleans and neutralizes in one process. I would also avoid the turbo nozzle it would be a little too aggressive I believe. If you use a caustic be careful not to make it too strong or you may damage the surface. Also remember it will be running off the roof you don't want to damage the surface below. Treat an area and pattern clean with a wand an area you can complete before it is. Most important is to make sure you rinse well residue left behind can cause it to peel especially the oils by he venthood.

  • #13
    Member Graduate Student pdmcali's Avatar
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    When we do metal roofs we make our mix 40% SH and 60 water and alway jetX plus never step a foot on metal roof. Our SH is 15%. Also I would rent a 35' towable lift and charge $1200 in our area. Six hour job.

  • #14
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    Thank you Paul and Phil.

    Very good advice.

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  • #15
    Member 7000 PLUS POSTER Doug Rucker's Avatar
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    How did this go?


    Sent from my iPhone using Tapatalk
    Doug Rucker-Call or text 281.883.8470
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    http://cleanandgreensolutions.com/co...ding-cleaning/

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  • #16
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    Quote Originally Posted by Doug Rucker View Post
    How did this go?


    Sent from my iPhone using Tapatalk
    It went great. I went with my first instinct and used a turbo nozzle with no chems. The only problem I had through the whole job was the boom lift breaking down. The painter starts tomorrow morning.

    Thanks for asking

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  • #17
    Member 7000 PLUS POSTER Doug Rucker's Avatar
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    Quote Originally Posted by Trainerboy View Post
    It went great. I went with my first instinct and used a turbo nozzle with no chems. The only problem I had through the whole job was the boom lift breaking down. The painter starts tomorrow morning.

    Thanks for asking
    Glad it worked out Got any before and after pics to share?
    Doug Rucker-Call or text 281.883.8470
    http://cleanandgreensolutions.com
    http://cleanandgreensolutions.com/co...ding-cleaning/

    VISIT OUR STORE HERE FOR ALL YOUR PRESSURE WASHING AND SOFT WASHING EQUIPMENT AND SUPPLIES

  • #18
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    Quote Originally Posted by Doug Rucker View Post
    Glad it worked out Got any before and after pics to share?
    I do.
    Ill get some posted later today.

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  • #19
    Member Honorary Professor AC Lockyer's Avatar
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    We have a thread on this over here, http://softwashsystems.activeboard.c...f-restoration/

    Also do a search for metal roofs there as well. Lots of information.

    AC
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  • #20
    Member Honorary Professor JDhomeservices's Avatar
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    Quote Originally Posted by AC Lockyer View Post
    We have a thread on this over here, http://softwashsystems.activeboard.c...f-restoration/

    Also do a search for metal roofs there as well. Lots of information.

    AC
    "You do not have permission to view private content in this forum."

    JOSH DAVIS
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    We are an awesome exterior cleaning service in the Ocala, FL area!
    We provide quality roof cleaning and pressure washing service in Marion County!
    Check us out on Facebook and Google +!

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