Over Framing on Roofs - Additional Dead Loads
Over Framing on Roofs - Additional Dead Loads
(OP)
I don't really have a set method for dealing with the additional dead load associated with framed over sections on a roof. Typical situations are with valley sets or sticked framing over trusses as shown below:

Usually this doesn't affect my numbers too much but I am wondering if others neglect this additional roof load or perhaps use some set value or increase to the dead loads at the reactions into the wall, beam or girder below.

Usually this doesn't affect my numbers too much but I am wondering if others neglect this additional roof load or perhaps use some set value or increase to the dead loads at the reactions into the wall, beam or girder below.
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com






RE: Over Framing on Roofs - Additional Dead Loads
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RE: Over Framing on Roofs - Additional Dead Loads
RE: Over Framing on Roofs - Additional Dead Loads
No use sharpening your pencil too much on wood framing as there is so much unintended redundancy and composite action.
RE: Over Framing on Roofs - Additional Dead Loads
Keep in mind that you get an extra layer of sheathing in addition to the valley trusses themselves.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Over Framing on Roofs - Additional Dead Loads
Frequently, for cross venting, a portion of the lower sheathing is removed anyway, lowering the additional load due to the overframing.
Mike McCann, PE, SE (WA)
RE: Over Framing on Roofs - Additional Dead Loads
How many design for a re-roof.
RE: Over Framing on Roofs - Additional Dead Loads
Mike McCann, PE, SE (WA)
RE: Over Framing on Roofs - Additional Dead Loads
Not too much I hope as that's the "diaphragmy" part of the roof.
I like to debate structural engineering theory -- a lot. If I challenge you on something, know that I'm doing so because I respect your opinion enough to either change it or adopt it.
RE: Over Framing on Roofs - Additional Dead Loads
A confused student is a good student.
Nathaniel P. Wilkerson, PE
www.medeek.com
RE: Over Framing on Roofs - Additional Dead Loads
They use 10psf around here for the top chord but I can see 7 being ok. 2 for sheathing, and 2 for each layer of shingles and 1 for self weight?