Power Washing and Roof Cleaning Forum

Steve Salley · Approved Exterior Cleaner

Strange Looking Growth Pattern

Barry Landis · Approved Exterior Cleaner

One thing I can see is the siding came from two different lot numbers. I'm not sure if there was a repair to the left end at one time or the contractor just had two different lots.

It doesn't look like there is enough overlap from one piece to the next either. Mainly where there algae staining is in the middle of the porch roof. They may be getting moisture behind the siding there, trapping the moisture and creating a constant drip on the roof area.

Be careful if it is Nail-lite brand imitation shakes. There was all kinds of issues with that siding years ago. You could walk up to it and put your finger through it. It would just crumble into pieces. We replaced tons of that stuff for a big apartment complex.

DirtyRoofcom · Approved Exterior Cleaner

That looks like what we call "naillite' siding. that is most likely a flaw with the siding. generally when you see the pattern that follows the edge of the siding piece it is a problem with the siding itself not the infestation. Ive seen this on the newer vinyl shakes.

DirtyRoofcom · Approved Exterior Cleaner

heres a picture of another one

Steve Salley · Approved Exterior Cleaner

Thanks guys
That was my call too. I do think there is some organic staining but definitely and dye lot issue too

Thank you again.

DirtyRoofcom · Approved Exterior Cleaner

Like to see how it cleans up though. Take pics