![]() With the wall there is plenty of "meat" to handle this rotational load. Speaking in simplistic generalities, what happens is there is a rotational load, caused by the outward push of the rafters, that happens right where both the rafter and rafter tie ends bear on the wall top plate. MknMike talked about "twist" and Wallmaxx gave you the diagram, but I think the reduction in your existing rafter span did not get through. However, first you have to verify the size and span of your existing roof rafters. It is possible to move the rafter ties up off of the wall top plate to a maximum 1/3 of the ridge height. I wanted to get the thoughts of you all, here, as I've seen many people get great advice from these boards.īelow is a picture of my current structure, as well as some diagrams of kind of what I'd like to accomplish. ![]() That said, I am not a builder, or a structural engineer, so I wanted to get more information. I had one builder out and he suggested that my township would never approve that, but that if I wanted to do it myself, it would be structurally sound and I'd likely never have any issues. Given that the current rafters are a total mess, it seems like adding these much beefier, stronger beams and in more places than we currently have them would be enough to keep things in good order. My thought was to replace the single 2x4s at 7.5 ft with 2圆s or 2x8s at 8.5ft and to add them to both sides of each board of the roof deck to give it more strength, and then add additional vertical and diagonal bracing along the way. So my thoughts are, finishing the existing rafters at only 7.5 ft is going to make the place very closed in and small, so I had the idea that I could raise the height of the rafters from tying into the walls at 7.5 ft, to having them tie into the roof deck at 8.5 ft, and then it could all be dry-walled to make the room feel much airier. I had initially planned to just make those look nicer, and then paint them, and the spray-foam insulation flat black in hopes that it wouldn't really be very noticeable, but as I've progressed on plans for the rest of the project, it's now obvious that the ceiling needs to be finished to match how the rest will look. Many of the rafters are made of several pieces of wood that are bolted together, and they're randomly tied into the roof, vertically, in various places, usually with a barely nailed-in 1x3. As you can see in the photos, they weren't done very well. Right now, the building has 7.5 ft walls, which are not very high, and the rafters for the garage run from wall-to-wall on top of these walls. Electrical is underway, and soon I'll be spray foam insulating the whole place, but one thing that has always bothered me is the ceiling height. I'm in the middle of turning my 1.5 car detached garage into the ultimate mancave/home office.
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