I have a quick roofing question.
I live in a terrace house with a 3m or so concrete alley separating the houses, half is mine, half the opposing neighbor, who has already extended his house to the line and up (3 floors). Therefore, the measurements I'm working with are approximately 5' deep by 13' long
Now there is too little light in there for a small garden potted yard (original plan) so I want to convert it to an outdoor laundry area - just washing machine and maybe store bicycles or the like.
My current plan is to use a wooden frame with PC roof. I live in the subtropics, so no snowload and there is little to no wind since other people have already built in the alley (our houses stand over 30ft) so lift isn't a problem. Also, due to the narrowness, rain isn't too much of an issue either (even during hurricanes), but we do get quakes.
This brings me to my two questions,
1. I plan to tether 4x4 posts to the wall and top them in pairs with 4x4 rafters to make 3 rough stands of decreasing height according to the drop I need (5 degree), then 2x2 purlins running the length to support and tie the roofing plastic to (see picture).
Is this strong enough?
(whoops, this should read 13x5
2. Do I need to tie the roof to the concrete structure (house) or would the tethering be sufficient?
I am out in Taiwan so I can't just ask at the local depot and the current building estimate is $5000
(when the materials will cost about $300) and the build quality is not above my own skills. Oh, and there aren't building regs...
Also, this is a temporary measure (3-5years) since I am saving to add a real strong roof in there and install a small toilet/dog wash/laundry area, but this will have to wait (for both the cash and until I find a decent builder here).