![]() ![]() Now, Options 1 and 2 are (in my opinion) the sturdiest, as they provide more full-size 2圆 bottom rafter for support attachment, but yet create the largest box. If I only depend on the sheathing and ladder to hold old overhand, it may sag over time without attachment to a very sturdy 2x12. Fascia purlins are to have upper edge bevel cut at an angle to follow roof slope (same as eave struts). If a choice exists between several boards to use for beveled fascia purlins, select ones as straight as possible. The most important thing I consider is the structure - I want not only the new rafters to securely attach to the 2x12 board from the top, but also securely tie in the old rafter below to the board to prevent sagging in the future, since 2x12 is the only thing that holds overhang of old roof on bottom of it. Figure 55-12 Cutting Fly Rafter Nail fly rafter to overhanging rake purlin ends and eave struts (purlins). If you extend the rafter ridge board, the fascia backers and the fascia will allow for extra support to the fly rafter. If needed there is extra support available for the fly rafter. The fly rafter also helps keep the sheathing straight. It’s used beyond the end rafter if needed. However, I cannot seem to decide best way to form the fascia board and subfascia at the new rake. A fly rafter is attached to the overhang, blocking, and the sheathing of your roof. The right side (pictured below) terminates in line with current roof’s rake, therefore, extra overhang of old roof below the connection will be trimmed and the existing siding wall will be continued for the new structure. If the building has hanging or fly rafters for the gable ends, cut them as well. Left side of this structure does not go all the way to the end of the existing house, therefore, it will terminate normally, with built up siding wall between old roof and new roof (similar to a dormer). Piece-by-piece rafter/roof construction, however, is still the more. I then ran and overlapped OSB sheathing and connected two roof sheathings. /rebates/&.com252fShowUserReviews-g1526420-d2161596-r485891825-ExploradoresOutdoors-SanPedroSanJoseMetroProvinceofSanJose. Cross section of a typical i section rafter loaded in a net upwards condition, generating compression in the bottom flange requiring a fly brace to be introduced to restrain against lateral torsional buckling. To tie the new roof to old, I nailed on a piece of 2x12 directly to old rafters in the middle of the roof, cut new roof rafters at an angle to attach flush to this board. The upward wind pressure requires that a fly brace be introduced to restrain the bottom flanges of the refers against buckling. The new roof is a lower sloping (3/12) barn roof that attaches to main roof (about 6/12). I have finally reached the point where I completed framing of the new sunroom/covered porch combination and am working on finer details.
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