I am looking into a preservative to put on it, and am very confused. I have done research on preservatives that have zinc and copper in them. I'm not sure if we should just wash it down and clear off any debris, or if we should put something on it. We were told that linseed oil would also work, but my research shows that is not a good option.
We would like something to help prolong the roof, and make it look a little more refreshed without damaging it.
Any help you could give in sorting through all of these treatments is greatly appreciated.