If you order the roof mount from Soudon they come with a plastic screw expander thingy. You drill a hole in the roof and use that to screw the mount down. I'm not sure exactly if it's waterproof, but so far seems to do ok. I will probably put some tar and/or caulk and maybe some sort of shingle cut a special way up there in a few days. Main reason I went with the roof is we don't have a lot of yard area in the front of the house facing south. We have maybe a 10 x 10 foot area that's not a part of a flower garden and that's about it. Also, put it up there to keeps kids from messing with it. We have a lot of kids in the area, and live about 1.5 blocks from an elementary school and 2 blocks from a middle school. Also, there's a big "heritage days" celebration every year that gets lots of people in our yard- happens the week before 4th of July, and they conviently have the parade route going in front of our house. I didn't realize that til it happened a few weeks ago. Heard sirens outside from the firetrucks, walked outdoors and all of sudden noticed the big signs that the police put up right next to my car that'd been sitting there all night that said no parking order of police - nice that they didn't let us know about all of this ahead of time. I ended up moving my car around the corner. Darn good thing I did, about 10 minutes later tons of clowns, antique cars, and horseback riders were parading right in front of my house. Next year, I invite the family over to sit on our front porch.
talk about a problem waiting to happen. 
