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Old 07-22-2015, 01:25 PM   #1
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Pressure washing a fiberglass roof

Cleaning my roof today. What a mess with baked on bird droppings from my winter in FL. The pros down there use a pressure washer on the roof so I thought I would give it a try with my 5 hp 2200 psi washer. Has a narrow fan tip and I worked it in about 3" wide strips going slow but backing off to a 6" fan moving quickly over the sealant. After about 15 minutes on big open areas, I thought I would give my rotary attachment a try ($60 Briggs and Stratton unit from HD). Wow. I can now clean 95% of the roof with double passes in less than a half an hour. I am not looking for a pristine roof, after all it is just a ROOF. Some minor bird and pitch stains left, but probably got 99% of the ones that were firmly adhered (wouldn't come off with just a blast of the hose).

Now, being old and lazy, I will seal it with something fairly good and easy, so I think I will try ZEP applied with a sponge mop. Several coats.

https://youtu.be/ayODxRly22k
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Old 07-22-2015, 02:55 PM   #2
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I did the Zep treatment and put on about 4 coats because the first 2 looked bad. I like the results, looks great and no streaking down the sides in the rain.
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Old 07-22-2015, 05:12 PM   #3
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Originally Posted by 530ktm View Post
I did the Zep treatment and put on about 4 coats because the first 2 looked bad. I like the results, looks great and no streaking down the sides in the rain.
I have two coats of Zep on and plan on finishing two more tonight, then into storage until November. Bottle recommends 4 coats.
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Old 07-22-2015, 06:28 PM   #4
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I pressure washed my roof last year and also used a heavy bristle brush with awesome to clean the roof. I then applied a total of 4 coats of Zep, still looks pretty good almost a year later. I'm going to wash it in the next couple of weeks and apply more Zep.
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Old 07-22-2015, 08:49 PM   #5
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Using a large pressure washer is a great method of finding loose caulking and roof leaks. I use a mixture of car soap in 5G water, with 2-3 oz bleach mixed in, applied with a long handled old RV wash brush. It seems to remove everything not supposed to be on the roof material. If anything very stubborn remains, a hand-full of SpicNSpan on the wet spot softens and removes it easily.
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Old 07-22-2015, 11:18 PM   #6
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Got it done tonight with 4 coats of Zep and now it looks better than it ever has. As far as the pressure washer, so far no loose Dicor sealant. I am more concerned with the chalking than with a close inspection. The ZEP so far has exceeded my expectations as far as shine. I didn't bother getting on my hands and knees for any of this project, so a few sap spots didn't concern me. Its a ROOF that no one is going to see but me. Looks like a gallon will be good for about three full 4 coat treatments. I applied it with a 9 inch "Water Wiz" applicator on a stick.

A close inspection of the gel coat shows absolutely no damage from the pressure washing. The rotary cleaner has a stiff perimeter brush that supports it and keeps the nozzles about 1.25" above the gel coat and doesn't run up on the sealant, it stays about a half inch from the edge of any obstruction. Those nozzles really spin, I would guess at least 3000 rpms.
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Old 07-22-2015, 11:27 PM   #7
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Quote:
Originally Posted by CJ7ole View Post
Cleaning my roof today. What a mess with baked on bird droppings from my winter in FL. The pros down there use a pressure washer on the roof so I thought I would give it a try with my 5 hp 2200 psi washer. Has a narrow fan tip and I worked it in about 3" wide strips going slow but backing off to a 6" fan moving quickly over the sealant. After about 15 minutes on big open areas, I thought I would give my rotary attachment a try ($60 Briggs and Stratton unit from HD). Wow. I can now clean 95% of the roof with double passes in less than a half an hour. I am not looking for a pristine roof, after all it is just a ROOF. Some minor bird and pitch stains left, but probably got 99% of the ones that were firmly adhered (wouldn't come off with just a blast of the hose).

Now, being old and lazy, I will seal it with something fairly good and easy, so I think I will try ZEP applied with a sponge mop. Several coats.

https://youtu.be/ayODxRly22k
Those rotary attachments are great for flat work. My son and I used one to do store sidewalks. But we did have a much bigger pressure washer at 3,600 psi, over 6 gpm and hot water boiler.
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Old 07-23-2015, 06:59 AM   #8
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I don't use a pressure washer any where in the MH. Too great a chance of loosening something that should not be loose, or driving water where it should not be.
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