Power Washing and Roof Cleaning Forum

mikepas · Exterior Cleaner

Old white roof?

Bryan P · Approved Exterior Cleaner

Looks like still some algae there. How did you clean it?

BlueRidge · Approved Exterior Cleaner

White roofs are always more difficult because the bio film (dead algae on the roof) shows up after the roof has been cleaned properly. It will lighten up after the rain hits it. Art Green came up with "bio film". I've always liked it.

Maverick Contracting · Approved Exterior Cleaner

If there is even the slightest granular loss in those areas it will always leave a "shadow presence"

Maverick Contracting · Approved Exterior Cleaner

Art G. has his bio film, I have my "shadow presence"😊

Art O · Approved Exterior Cleaner

It will clean up over time. I did a white roof a few years back. Today it looks mint!

Jeff Wible · Approved Exterior Cleaner

I never seen a white shingle roof. Except this morning,.it's snowing,..but anyhow.

I've seen and done about a million light gray roofs. The result when you leave depends greatly on the degree of algae on the roof. If there's alot,.you can kill it and perform the job properly altogether,...and it will still have shadows of what was there. I always tell customers on these jobs that the mold will be 100% dead,..and it will be 95% visibly gone,..and then explain the process. Never an issue.

Light green roofs also show the shadows.

Brown roofs are the best for instant results. Obviously!

Jeff

Jeff Wible · Approved Exterior Cleaner

Maverick Contracting wrote:
If there is even the slightest granular loss in those areas it will always leave a "shadow presence"

Granule loss is something I always try and point out if present,..and also those black streaks coming out of ridge caps as well. Must be the fasteners leeching I guess?

The other thing, especially on big roofs is natural shadows from imperfections in the way the roof lays.

Jeff

Art O · Approved Exterior Cleaner

mikepas wrote:
Here's and old white roof that we did, what do you think? Do they clean up better then this? not to bad just wondering if i could lighten it a little more. first 2 are before last one is after.

Mike I fixed your post. You need to put a little effort into making your posts look good. Grab your pic's by the corners and drag them in to fit the screen. Wording goes on top of the pics.

Fred W · Guru

It will look great after a rain or two. White roofing is just that way. We rinse every roof and I always tell the client "Mother Nature will make it look even better" We look "1000" times better before we leave (clients numbers not mine. I always want to laugh when they say 1000) but there is always more

Bryan P · Approved Exterior Cleaner

Jeff, it's interesting that you've not seen a white shingle. I roofed houses all summer long in Texas one summer. Was working in a lower income area of Fort Worth. Every job was an insurance claim and every single roof was white. The thought was that the white shingles made the house cooler. White shingles can look trashy by just walking on them on a hot day. I've literally left footprints. Also, certain colors are only available in certain areas because the plants only ship to certain states.

Jeff Wible · Approved Exterior Cleaner

Hey Bryan,..I figured it may be a regional thing due to heat draw. Lets see if any other Northern guys have seen them?

Unless what I see as light gray is considered white? Like what the original poster showed,..to me that's gray,..not white. I'm thinking truly ,....WHITE,... like the siding on that house.

Jeff

-- Edited by Jeff Wible on Friday 10th of March 2017 11:00:25 AM

Bryan P · Approved Exterior Cleaner

We had two colors when I was working in South Carolina. Aspen Gray and Shasta White. Both light colors.

Jeff Wible · Approved Exterior Cleaner

Hey Bryan,.I can't say I ever seen that shade of shingle,... "Shasta White"

Jeff

Roofcleanse+ · Approved Exterior Cleaner

Don't see many white roofs in Wisconsin. To me they are drab looking

Cleaned this roof about five years ago, middle of October at about 55 degrees.

Was a little leery about doing it at that temp. but the owner was putting house up

for sale and wanted it done. a little staining remained but by summer it looked like new

The homeowner was happy and that is what mattered

Before Roofcleanse+.jpg After Roofcleanse+.jpg

DirtyRoofcom · Approved Exterior Cleaner

White and silver exist here in the northeast although white is rare.

both of theses shingle colors come clean after a rain or 2.

unless like maverick said granular loss then they look like poop

Jeff Wible · Approved Exterior Cleaner

Roofcleanse+ wrote:

Don't see many white roofs in Wisconsin. To me they are drab looking
Cleaned this roof about five years ago, middle of October at about 55 degrees.
Was a little leery about doing it at that temp. but the owner was putting house up
for sale and wanted it done. a little staining remained but by summer it looked like new
The homeowner was happy and that is what mattered

Nice dramatic before and after. Makes a statement!.

Jeff

mikepas · Exterior Cleaner

I hit this with 50% water 50% SH 12.5% with some gain. The SH i had for about 2 months. it might of been a little weak.

I took some before pictures of the back of the house

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Roofcleanse++

Chetek WI