WALL parapet parallel to roof truss for wind load
WALL parapet parallel to roof truss for wind load
(OP)
WALL parapet parallel to roof truss. Can peremeter truss hold the wall for wind load? Roof is only 3/4" plywood, and I cross braced end three trusses.
Thanks
Thanks






RE: WALL parapet parallel to roof truss for wind load
RE: WALL parapet parallel to roof truss for wind load
But even it's not parapet, say just a wall, can the roof diaphram and cross brace take the load?
Is anyone sure how to check for it?
RE: WALL parapet parallel to roof truss for wind load
RE: WALL parapet parallel to roof truss for wind load
RE: WALL parapet parallel to roof truss for wind load
RE: WALL parapet parallel to roof truss for wind load
hokie66: you said the cross brace will take the moment, I feel it will be only lateral load. The diaphram as a pin ponit, will take the lateral load. Cross brace will brace the horizontal load on the top chord. And the essential connection would be the tie of the bottom chord to base plate for uplifting.
Just need someone to check whether I am missing anything.
RE: WALL parapet parallel to roof truss for wind load
EIT
www.HowToEngineer.com
RE: WALL parapet parallel to roof truss for wind load
RE: WALL parapet parallel to roof truss for wind load
RE: WALL parapet parallel to roof truss for wind load
Currently there is not much resisting wind on the back side of the parapet or leeward pressure on the masonry wall.
I think what you have is doable as you do need the cross bracing or at least a kicker to brace the top of the masonry wall. However I think I would add solid blocking at the top cords to so that the force may be developed into the roof diaphragm and add straps top and bottom for tension (leeward wind).
EIT
www.HowToEngineer.com
RE: WALL parapet parallel to roof truss for wind load
I know kickers would be the best (it would work both windward and leeward), but I want to cut the cost.
Only thing I am worried about the cross brace is that all the truss load will have to pass to both ends of the trusses. The spans of the trusses are weak points actually.
RE: WALL parapet parallel to roof truss for wind load
The lateral support of the CMU wall concerns me also. Diagonal struts would help, specifically detailed to handle the 200#/foot minimum.
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com
RE: WALL parapet parallel to roof truss for wind load
By the way, do they really want the EFIS on top of stucco? I thought stucco (or some other hard coat) went on top of the EFIS.
RE: WALL parapet parallel to roof truss for wind load
It would be easier if you could extend the masonry wall up to the top of the trusses but I think with careful detailing i.e. make sure you have a direct load path to the diaphragm and design the connection accordingly, this could work.
EIT
www.HowToEngineer.com
RE: WALL parapet parallel to roof truss for wind load
BA