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May 13, 2010

A/C unit stain on asphalt shingle

ChrisDuffy · Guest

is it possible that it might be dryer lint? i have not come across an A/C stain.

May 13, 2010

No it's not lint,its drains out of the A/C pipe usually from the second floor.I have only seen it about five times,usually you don't notice it.

Green Apple Roof Cleaners LLC · Premium Member Roof Cleaning Institute of America

I do know what that may be. Normally the condensate that comes from the A/C unit is somewhat distilled and clear If there is something in the air the air going into the unit will condensate on the coils then will run out through the drain.Some Hair salons Have a/c units with oily coils due to the chemicals

May 13, 2010

Well I have only noticed it on residential locations,average homes I dont know if they have anything really in the air. But thanks for the thought.

Great White Technologies · Roof Cleaning Institute Of America Certified Roof Cleaner

I would guess that is a calcium build up. I have seen it in humidifiers. Normally you replace the filter in the humidifier. I don't know what will remove it but it might be a place to start.

May 14, 2010

Great White Technologies wrote:
I would guess that is a calcium build up. I have seen it in humidifiers. Normally you replace the filter in the humidifier. I don't know what will remove it but it might be a place to start.

Yes Pat, that is correct. It is most likely calcium build up.

I use a mixture of 85% phosphoric acid and a little muratic acid.

Cut it down with a little water and apply with a pump sprayer for roofs (make sure there is no bleach on the roof, do NOT mix bleach and acids together)

For vinyl siding I use PH straight with a little muratic in a bucket and apply with a brush.

Usually comes right out.

-- Edited by Roof Cleaning Pro Greensboro NC (336)362 7659 on Friday 14th of May 2010 02:59:16 PM

BCRoofClean · Guest

Good info! I'm sure the guys in the states with swamp coolers will benefit from this as well.

Guest

It could be a spot where someone else tried to clean it with ox and left it on too long, bleaching the shingles.

May 14, 2010

I think Pat and Mike hit it on the head,thanks guy's I appreciate the help.

guest

Great White Technologies wrote:

I would guess that is a calcium build up. I have seen it in humidifiers. Normally you replace the filter in the humidifier. I don't know what will remove it but it might be a place to start.

If you can't figure out how to get the stain out, you need to think out side the box, like patching it in with new shingles? the same color of course.

May 14, 2010

I think I will try Mike's mix first,I dont want to start replacing shingles. If I don't think a cleaning will benefit the home owner I tell them to contact a roofer. I did that twice this year already...one had so much granuel loss it was amazing the other roof was also shot.Once you start replacing shingles you own it,problems in that area can be on going like leaks,and for the little money it ain't worth the headache. I say step aside and let a roofer handle it...just my thoughts.

Great White Technologies · Roof Cleaning Institute Of America Certified Roof Cleaner

Walk wrote:

Great White Technologies wrote:

I would guess that is a calcium build up. I have seen it in humidifiers. Normally you replace the filter in the humidifier. I don't know what will remove it but it might be a place to start.

If you can't figure out how to get the stain out, you need to think out side the box, like patching it in with new shingles? the same color of course.

When and if I run into it I will figure it out. All we have here are heat pumps and they are on the ground. No need to waste time investigating if I don't have any to clean. From the description it just sounded like calcium to me.

Good luck with that Pat, I'm sure that Mike's solution will work for you.

May 15, 2010

I am doing the roof next week I will take photos and post them..Mike said not to mix with the roof solution. I probably will do the A/C unit first then clean the roof another day.Nice to see you on here Pat,hows things going for you so far?

Great White Technologies · Roof Cleaning Institute Of America Certified Roof Cleaner

Busy Busy Busy.... Starting 6700 linear feet of fence cleaning on Monday.

May 15, 2010

Thats great,what do you use to clean it? About how much a foot?

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"Find A Certified Roof Cleaner Directory"