Just doing the math in my head with 32" to make the numbers round, that would give me, from front to back, 24" spacing in the 4 rafter cavities above the loft, then one 32" spaced rafter where the staircase would be, then the last three rafter cavities toward the back would be around 21". I could bridge the rafters with 2x4s every maybe 24" to alleviate that If necessary. I realize it will complicate the roof sheeting, but I could live with that for the easier access.Ībout the only problem I can see is the metal roof and roof sheathing not being able to adequately span the larger gap in a snow load situation. So I'm wondering if I can space one set of rafters farther apart - maybe 30" or 32" and then evenly space the remaining rafters towards the back of the structure. So if I put a ladder that runs top-to-bottom along the ridge beam, I think it will likely be fine, but I'm considering putting in narrow stair with a short landing - something like this picture:Īs the part above the landing runs along the joist to the loft, it has to fit between that space, and 20" is pretty narrow. So, from the edge of the loft to the first rafter tie, if my math is right, would be just over 20". It's about the only time that two people could potentially be standing (crouching) over a single joist as one person gets up into/out of the loft with the other person right behind. The edge of the loft, I'd like a doubled joist for a more solid feel when getting into the loft. Roof will be 7/16 OSB covered in roofing felt with the corrugated metal roof on top of that. 2x10s so I can insulate later, but right now it will be a 3 season cabin. The other 8' of the structure, I plan on using rafter ties in the lower 1/3 of the rafter to give that area more open feel. The loft will extend 4' over a porch so the total footprint will be 12x16 with the roof peak running the 16' length.įloor joists over the loft will be on 12" centers. Planning 12x12 cabin with 2圆 walls and a loft. Small Cabin Forum / Cabin Construction / Rafter spacing - metal roof Forums - Register/Sign Up - Reply - Search - Statistics.
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