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6 post(s) First 1 Last
Horizontal . . . . wall bracing
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Re: Horizontal . . . . wall bracing By  engineerguy

Posts: 0

7/26/2007 8:24:00 AM

There needs to be something between the ground and ceiling holding it there laterally. No, a stiff ceiling on top is not a ''substitute'' for shear walls. There are other ways to hold it up besides shear walls (like steel frames, columns etc. that have/are designed for lateral resistance). Is it total glass on ALL four sides?

Don''t have much info on the building to be sure, but from what you HAVE said, it sounds like this needs to be engineered. An architect can do that, if they know how, but the calcs need to be done, and a complete lateral load path needs to be established...not just someone saying ''throw some strapping in the ceiling, yeah, that should be good enough)


Re: Horizontal . . . . wall bracing By  tsmith

Posts: 0

7/26/2007 8:28:00 AM

Take a stiff rectangular object, let''s say a book, to represent the roof/ceiling. Balance it on something to represent columns, let''s say four round dowels. If you''re able to get this to stand up at all, test its resistance to lateral forces by jolting the table it''s sitting on.

You''ll find that it has none at all, unless the dowels are somehow rigidly attached to the table and/or the book, and/or the book is attached to something else which holds it in place.

The architect should know that he needs a structural engineer.


Re: Horizontal . . . . wall bracing By  Uncle Bob

Posts: 0

7/26/2007 8:52:00 AM


"I''ve got an architect who is proposing to install metal straps on the ceiling framing members (diagonally from one corner to the other), forming a big X."

This method of shear wall bracing is being used as an alternative method for residential garages.

Using Simpson CS18 strap bracing spanning diagnally across the garage ceiling. Strap is nailed to the underside of each ceiling jost with 10D nails and extend over the wall plates and down and around corner stud cluster and secured with minimum of ten each, 16D nails. Of course, this comes with design drawings and a registerd Professional Engineer''s stamp.

The above method is accepted here with the Engineer''s design drawings and Stamp.

Your particular situation may be different.

Uncle Bob


Re: Horizontal . . . . wall bracing By  Bob Garner

Posts: 0

7/26/2007 9:18:00 AM

It sounds to me like he''s bracing the roof/ceiling for horizontal diaphragm action. This is fine but there has to be at least 3 shear walls (braced or otherwise laterally supported) below the roof. One wall can be open, with the roof considered to be cantilevering horizontally from the opposite wall. The other two walls are required to resist rotation from the roof cantilevering horizontally from the wall opposite the open wall. The roof dimension from the wall opposite the open wall cannot exceed 25 feet.

I hope this makes sense to someone.

Bob Garner, S.E.


Re: Horizontal . . . . wall bracing By  eggster

Posts: 0

7/26/2007 11:47:00 AM

Please have your Architect, Contractor, and Structural Engineer, and you, as well, look through the TOR-EGGS-TOR DESIGN SOLUTIONS with CLOSED-NETS Website to see if there are any design methods that Closed-Netting might be able to resolve with your issues and concerns. We can provide more specific info if desired. Sounds like your situation is unique, rare at best, and in need of some specialized strapping designs.

Have a Blessed Day and Beyond, Randy, Family, and Associates.

P.S. We agree with your Project''s need of Structural Engineering.

Randy Lee Dube; retired Building Official, Inspector, Plans Examiner (Designer forever)!


Re: Horizontal . . . . wall bracing By  cboboggs

Posts: 0

7/26/2007 1:31:00 PM

Engineering required.


6 post(s) First 1 Last
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