I am remodeling an upstairs bath that is in a dormer area. It is a big shed dormer across the back of the house. The dormer roof has a slight pitch, not a lot. I have many skylights in the house but none in this area where the roof doesn't have a steep pitch. Where can I find the requirements easily and how do I measure pitch of roof to see if it will work? I have tried the Velux and Anderson sites and they are very hard to navigate with reagard to this question. We are having a bath remodeler do this but I am living with it for the long run, they are not so I want to be satisfied myself before I decide to do this.

Thanks.