Building a flat overhang structural advice
Looking for some structural advice and suggestions on a future project I’m hoping to possibly tackle this summer or fall. I want to build a flat roof overhang just above the backyard door of my house, which will be double french doors eventually, that would walk out onto the patio. The overhang would serve as some shelter from rain and sun, offer some lighting and of course add some architectural appeal. I am thinking the overhang would come out somewhere from 2′ to 2 1/2′ and the width would span 6′-8′ potentially; just putting ranges for the time being as I haven’t determined the exact depth or width. Planning to use either 2″ x 8″ or 2″ x 10″ lumber for the framing. I would like it to be a flat roof/overhang to have more of a modern look and I don’t want to use any posts on the ends, I ideally want it free hanging.
My question is, is it possible to build this by mounting a ledger to the exterior wall with lag through bolts as your main point of support to the house? The interior framing would be 16″ apart on centre, with the same sized dimensional lumber used on the outer frame (2″x 8″ or 2″ x 10″). For added strength and support, I was thinking to use steel L brackets fastened on the inside of the side framing and screwed with lag bolts into the ledger, and use metal joist hangers for the interior portion. I realize that despite this not being extremely large, relatively speaking, there is still a significant amount of wood being used that will create substantial weight, and additionally having to factor in snow weight during the winter season. I understand the most ideal way of building such would be if it was tied into the existing houses structure/joists but I’m not willing to go to those lengths and destruction to build this, so hoping there is another feasible option. Is this idea at all possible or is it destined too fail? If so, is there another design that anyone might be able to recommend that can be applied to build such? I’ve attached a picture of a roof with this type of look and what I’m hoping to somewhat accomplish, to give you a visual.
I’m merely a DIYer so my experience is certainly limited and looking for some folks here who can shed some expert advice. Sincerely appreciate any input. Thanks!