f9 took the rust of the roof and their a noticable difference in the shingles - Certified SoftWash Roof Cleaning

Zach Maynard · SoftWash Systems Certified Applicator

f9 took the rust of the roof and their a noticable difference in the shingles

Christopher LaGrasta · Sophmore Member

I USED F9 ON THE ROOF DO REMOVE RUST (SORRY I DIDNT TAKE A PIC BEFORE) AND ALL OF THE RUST WAS REMOVED BUT IT LEFT A NOTICABLE DIFFERENCE.

1. I USED F9 AT 75 PERCENT STRENGHT

2. THEN I WASHED OFF THE F9 WITH WATER

WHAT DID I DO WRONG IF ANY

Jeff Thompson · Junior Member

Don't think you necessarily did anything wrong, just looks like F9 cleaned the shingles where it was applied. If home owner is concerned, I would just clean the rest of the roof with you usual roof mix, not F9.

Christopher LaGrasta · Sophmore Member

THE ROOF WAS NOT WET BEFORE I APPLIED THE F9 ZACH, I SHOULD HAVE DONE THAT

HEY JEFF THATS SOUNDS LIKE A GREAT IDEA THANKS

Tim Teed · SoftWash Systems 5-Star Professional

did you clean the rest of the roof?

Christopher LaGrasta · Sophmore Member

no just removed the rust from the chimney cap

Christopher LaGrasta · Sophmore Member

WHAT SHOULD HAVE BEEN THE BEST WAY FOR ME TO REMOVE THE RUST

1. SHOULD I HAVE WET THE RUST FIRST THEN SPRAY ON F9 (WHAT STRENGHT)

2. SHOULD I HAVE FLUSHED THE F9 FROM THE ROOF AFTER I SPRAYED THE F9

Zach Maynard · SoftWash Systems Certified Applicator

Definitely prewet before treating, then start with like 30 percent strength and progress in strength as needed. Usually 50/50 does the trick. Then rinse really really really well. We usually like to "feather in" the area surrounding the stain so any change in color is progressive and not noticeable.

Tim Teed · SoftWash Systems 5-Star Professional

Always clean the roof or the surface around the rust at least wall to wall on siding or gable to gable on roof. Its no different than if you sell a roof cleaning and they have a deck - always give the option to clean the deck because there will be clean spots. Even if they say no, I clean the deck anyways because it will look funny. If they didnt want to pay for cleaning the roof, clean it anyways and then their "charge" is to leave you a good review on angies list or google review as a favor.

Jeff Thompson · Junior Member

That's a great angle Tim. I'll keep that one in my hip pocket for future reference.

Doug Rucker · UAMCC Officer

When cleaning rust on shingles, always pre wet the surface. Using 3 parts water to 1 part F9 apply to shingles, let dwell a couple minutes, don't let it dry, rinse after each application, and after you final application and all the rust is gone, apply a mixture of Green Wash and water to neutralize.

Michael Derose · SoftWash Systems Certified Applicator

How does green wash neutralize acid? I would think baking soda would do a better job of that. That is what we use.

Michael Derose · SoftWash Systems Certified Applicator

How does green wash neutralize acid? I would think baking soda would do a better job of that. That is what we use.

Michael Derose · SoftWash Systems Certified Applicator

Sorry double post.

Craig Harrison · Sophmore Member

Doug Rucker wrote:
When cleaning rust on shingles, always pre wet the surface. Using 3 parts water to 1 part F9 apply to shingles, let dwell a couple minutes, don't let it dry, rinse after each application, and after you final application and all the rust is gone, apply a mixture of Green Wash and water to neutralize.

I like Doug's approach here for shingles. It's better to use a diluted strength and take your time. Treat it like a restoration rather than going straight in for the kill. Once you have your dilution and methods down, you can increase the strength to suit how much time you can spend on the job. The more you use F9, the better you will get and know how strong you should be applying it.

Just like with concrete, you should always use light mist sprays and feather the product out 2-3 feet going lighter the farther away you are from the original rust stain. This will make it blend should there be any color issues afterwards.. which may happen but are rare.

Here is the link for dilution ratios and technical data: Best Rust Remover

-- Edited by Craig Harrison on Sunday 24th of November 2013 04:53:49 PM