Certainteed Vinyl Shake Siding Manufacture Defect

[The Roof Cleaner]

During a recent roof and house wash, we came across this vinyl shake siding that we thought had algae on the siding and could not get it cleaned. We increased the house wash to 10% SH and still looked the same. After a while the homeowner showed up and we found out that this was a Certainteed vinyl shake product that was defective and could not be cleaned per the homeowner. We lost a lot of time on this job trying different things and making several phone calls. Thought this info may be helpful and save time for other roof cleaners if you come across this.

[Guest]

During a recent roof and house wash, we came across this vinyl shake siding that we thought had algae on the siding and could not get it cleaned. We increased the house wash to 10% SH and still looked the same. After a while the homeowner showed up and we found out that this was a Certainteed vinyl shake product that was defective and could not be cleaned per the homeowner. We lost a lot of time on this job trying different things and making several phone calls. Thought this info may be helpful and save time for other roof cleaners if you come across this.

​Thats Nailite Shake. Its a painted finish, Junk

[Richard Frisson]

why didn't you just buff an area with your finger, I've come across this before and when it didn't do anything I just rubbed my finger over it to test for chaulking.  never have i had to go over 1.5% for any exterior home siding.  never have i used 10% SH on any surface at any given time.  The sodium hydroxide is quite high after 6.25% and can cause long term damage on any surface

[Doug Riemer]

thanks i see a lot of these in my area i will watch out for that