"Remi" wrote in message
news:nHdci.26216$xq1.16615@pd7urf1no...
I have a cedar shake roof and a company has suggested that they treat it
with a chemical to extend its life. They will give me a 10 year warranty.
Although I don't trust the warranty, I would like to know your opinions of
this procedure. Is there such a thing as extending the life of a cedar roof
by applying a chemical to it? Thanks.

Find out exactly what they are going to put on it. Brand name, etc, and do
a little research. There are oils used for furniture exposed to the
weather, so there may be some products for a roof. Most are only for a year
or two, not 10.