On Sun, 30 Aug 2009 11:53:07 -0400, Aaron Fude
wrote:

Hi,

On the north side of my house I have moss on the slate roof. I'm
concerned that it's pushing the slates apart. My roof is 90 years old.

How do I combat this problem?

Thanks,

Aaron

Moss does not like pulverized lime, but that will color your roof
white. The are moss killers you can apply.