Tek Screw Shear Fastened Thru 5/8" Sheetrock
Tek Screw Shear Fastened Thru 5/8" Sheetrock
(OP)
I have a situation where I need to fasten a light gage track to a stud wall thru 5/8" sheetrock to resist shear from gravity loads. I am trying to avoid this, but my client is pushing me to at least do some research. Does anybody know of any testing data that has been done for this condition? I already called Buildex and while they recognize that this comes up alot, they have no testing data.
Thanks
Thanks






RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
I think I will call it a day and go with costlier Plan B
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
The screw to stud connection offers a single point of contact, and is a pinned connection (no rotational resistance).
Even if you came up with some method of justifying a cantilever, I don't think it would be convincing enough to satisfy my comfort level.
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
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: Tek Screw Shear Fastened Thru 5/8" Sheetrock
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
Using the following table you can interpret the plowing force resisted by a certain number of #6 screws (ex - 1.5-#6 screws resist 184 lbs of shear, ultimate)
http://www.bayarearetrofit.com/PDFs/Drywall%20shea...
This one, using steel studs, shows on page 19 - #6 screws at 6" edge spacing resisting 748 lbs/ft ultimate (this is for double sided test - say ultimate is half) - pg 13.
http://texas.transconsteel.com/Products/CFS/docs/2...
For the track to wall, check for compression stress on the GWB (200 psi or something).
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
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: Tek Screw Shear Fastened Thru 5/8" Sheetrock
I do have a similar situation, however, where I need to attach some soffit ceiling joists to the studs thru the gyp. The load is only about 70 lbs under wind and much less under gravity (they only span 5 ft.). I think I am going to feel ok about using (2)#10 for that.
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
Some background explaining the basis is at http://www.google.com/url?sa=t&rct=j&q=&am...
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
Interesting... I am not sure what they mean by a "prying condition" however. 100lb allowable w/o prying, 15 lb w/ prying. I assume a track fastened to the wall would be a non-prying condition?
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
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: Tek Screw Shear Fastened Thru 5/8" Sheetrock
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
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: Tek Screw Shear Fastened Thru 5/8" Sheetrock
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
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: Tek Screw Shear Fastened Thru 5/8" Sheetrock
Does the vertical load go through the gyp and then make its way back into the studs through screws further down the wall? Or is there some shear friction effect going on? Is it through the fixity in the screws?
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock
XR250 - But, i hesitate to use this ESPECIALLY for a floor system.
I fail to see where fixity can be obtained with any cantilevered TEK to CFS unless you weld it. Even then, will the CF hold up? Perhaps! But my thought of welding seems impractical. I never design any CFS to CFS unless there is intimate contact. Especially for a floor system.
Who is installing the screws?
Are you going to inspect each screw installation?
Think of the weakest link...
RE: Tek Screw Shear Fastened Thru 5/8" Sheetrock