Types of moss/lichen?

just curious if most types of roof mold comes off pretty much the same? there’s a few houses I’ve been asked to quote that have the very large patches of moss, do they dissolve and fall off along with the streaks? or does it take more

The algae, blue green, black, whatever color you have. That dissolves and changes color right away, just wainting for a nice rain or two to wash it away.

The moss? It turns bright grey /white and sits tight. It looks bad and then you are tempted to get up there with a broom and water hose and try to make it go away.

Lichen. They turn bright too. What an eyesore after they are dead.

so the moss and lichen will wash away eventually also?

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It requires a fair amount of education on your part. The client will not be happy with the results if it looks worse after than it did before. The moss will eventually go away (what I’ve seen anyway). The lichen will leave too.

It took a long time for the roof to get in this state, let’s give it a little time to clean itself up after we kill the contaminants

that doesn’t sound great! why can’t it be rinsed off? It seems like some people rinse and some let nature take care of it. why such a mixed thought process?

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You would have to ask the other people why they are mixed up. I can only speak for myself.

Lichen place sizable physical tentacles onto, around, and in between the granules that make up the top surface of the roof. You can kill them and you can then rinse them off but they are going to leave a bald spot where they pulled the granules off when you blasted them from the surface. The theory is that if you kill them and then let then alone, the fibers will eventually breakdown and gradually leave without doing a bunch of harm to the shingle.

Moss; you can take your snow shovel up there and scoop it off after you kill it if you like. I’m not going to. You can blast the moss loose and rinse it off if you wish to play the part of hero. I don’t. I tell people that it is going to look bad when it is dead as it will be even more visible than it is when it is alive.

We all get to make up our own rules that apply to us as we go along. Not everybody likes mine and that is cool. They can make up ones for themselves.

I don’t know that I have ever rinsed a roof in my life. I tell them that mother nature will rinse it in good time. If they are impatient, they can pay me to do it but they will get a better job if they leave it alone. Most people look to you as the expert so be prepared to explain your position when challenged.

makes sense to me, i would definitely prefer a superior outcome and less work… thanks as always Tim

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If you can do Tim’s method and you can educate your customer to understand this process you’ll be be better off for it.

In our case we rinse the roofs clean when done in all cases. It’s the same principle for us in that all house washes include gutter brightening with the wash. We want our customer to look at the “WOW” factor as well as the passerby’s in that when our job is done the house looks as good as it can for what the person paid for.

The other thing is I’m never at the residential jobs anymore and I don’t want my guys to try and convince our customers that the roof may look not to great now but in a few weeks it will look great. We also rinse at high GPM’s which also works to our advantage.

Either way if you can do Tim’s way and you get your customers to accept this you’ll be much better off and will probably make more money for yourself in the process because you will be out of there faster and time=$$$$

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ok Thankyou john. I see you’re in NY also, nice to meet you. I also decided I want to include gutter whitening in my house washes, after leaving a few dirty gutters on clean houses, just doesn’t seem right. Do you guys use F13 right in your hw mix to get the process going or do you just separately clean the gutters? would there be any harm in adding it to your mix?

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The gutter brightening we do seperately with a brush. It’s probably the hardest part to do on the house washes because house washes are generally a full pump system where you -wet the house- apply soap to house-rinse the house clean. Bang bang bang done. The gutters fall into this except the guys dip the brush in a bucket and just run it down the gutters and then rinsed cleaned— that’s pretty much how we do it.

As for roofs in NY the moss/lichen sticks harder here so it seems because people wait so long between roof washes. It’s not uncommon for us to get a roof that’s at least 15yrs old and it’s never been cleaned.

Other states especially Florida are way ahead of the curve on this where the roofs there are cleaned on a regular bases(mold grows there so fast because of the damp hot climate) so what they do like in some other states is the guys wet the area then spray on roof mixture and they rinse the landscape areas and leave. Since it rains there alot they let mother nature take care of the rest.

Hope this gives you a little more understanding about roof cleaning.

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