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Notches in rafter board


tnpappas
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These notches are in a rafter board at the gable end. There are braces in the notches that are connected to truss framing. Not all of the notches are directly over a stud. Is this an acceptable method?

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First you need to get your nomenclature correct; those are not rafters, they're trusses. Second, you cannot cut any web or chord section of a truss. With that said, what you have there probably won't cause any problems because the gable truss is not under the same loads as the rest of the trusses, but it's still wrong. The gable truss is usually 3 1/2" shorter than the others and the dutchmen (or purlins, look outs, whatever your local vernacular) should be on edge to provide adequate support for the overhang. Typically the overhang can extend as far as the truss spacing without any additional support if it's framed as I described it. With the truss framing as it is in your pictures the overhang should have been ladder frames nailed to the exterior of the gable and supported by the roof sheathing. Ladder frame overhangs typically extend no more than half the truss spacing.

One more thing, when you see OSB sheathing on the roof, it is supposed to be smooth side down, be installed with clips like you can see in the second pic, and it must be approved for roof sheathing. But you knew that already, right[;)]

Tom

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That end wall "truss" is not technically a "truss"----just filler the shape of the trusses and the filler-truss transfers its roof loads to the wall below. One can pretty much do what they want to this structure----like create the outriggers for the overhang.

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These notches are in a rafter board at the gable end. There are braces in the notches that are connected to truss framing. Not all of the notches are directly over a stud. Is this an acceptable method?

That's a gable-end frame truss. It's not a structural truss. It's nice when the truss company assembles them shorter than the rest of the trusses in the set so that you can lay the look outs on top, as Tom described. However hardly anyone does that around here. They just do exactly what's shown in your picture. I think the setup in your picture is ok.

- Jim Katen, Oregon

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I have never had a truss package delivered that did not have the gable ends included, with a engineered stamp on it. As such if it came with a engineered stamp, then no modifications should be made without the engineers approval, in writing with a seal.

Normally if the engineer knows that outriggers are being installed, they will design the gable end to be lower, or provide a detail for a notch.

Have a great day

Tim

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