I'm adding a separate single story two "car" garage to my house and I'm looking for ideas on how to build a "dormer" roll off roof observatory. I'm good on how to design the concrete piers that are isolated from the slab, but what I'm wrestling with is how to do a wind and rain "proof" roll off roof design that won't have a bunch of external trusses or support mechanisms that my HOA will object to. I can't do a dome and the roll off roof will need to match (aesthetically) the rest of the garage so it will need to have a shingle roof. I also need a design that will hold up to winds and rain. I live in the hill country and we can get fairly high winds (and hail) with storms in the spring (and remnants of hurricanes in the late summer/fall).
A brief description of the base project:
The garage is 26' x 32' with a single story and a 7/12 pitch gabled roof on a concrete slab. The internal ceiling height will be 10 feet from the bottom of the roof trusses to the floor.
I plan to have two concrete piers so I'm looking at roughly a 7' x 9' opening in the rear left half of the roof as a planning factor. The back half floor space (13' x 12') of the left side car bay will be used for the observatory to provide room to build an enclosed walk up deck with the piers from the ground to the observation height.
So, a couple of questions:
1. Has anyone done anything like this and do you have any pics or diagrams?
2. Has anyone used 80/20 extruded aluminum framing and 80/20 rollers (similar to the Pier Tech roll off roof) but skinned it with plywood and shingles? Will the 8020 framing and rollers support the added weight.
Thanks in advance for any ideas and clear skies to all!