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RE: horiz. diaph.[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: <seaoc(--nospam--at)seaoc.org>
- Subject: RE: horiz. diaph.
- From: "Dennis S. Wish" <wish(--nospam--at)cwia.com>
- Date: Tue, 30 Jun 1998 12:01:05 -0700
IMHO, the main difference is that the panel is more forgiving to overnailing which plagues 4 ply panels. This is of less importance when dealing with a low-load horizontal diaphragm than with shearwalls. I make sure that I specify 5-ply panels in vertical shearwalls since I expect the contractor to overnail more than 20%. As long as he does not penitrate more than one ply, I can still obtain the same values as I would if I used a 3/8" panel. Most of the builders want to save money by using 3/8". Based upon my personal observations, I won't allow it unless the builder has a history with me where I am assured that he either hand nails or can control the pressure of his tools. I don't think that there is any difference between a four or five play vertical panel in capacity strength. I don't have a code in front of me, but remember that vertical shear panels of 3/8" thickness can be increased in capacity to match 15/32" capacities as long as the studs are spaced at 16" on center. Therefore, the only advantage I can see to 5-ply panels is the contol that you gain by defects in nailing that occur in the field. Dennis Wish PE -----Original Message----- From: Mark D. Baker [mailto:shake4bake(--nospam--at)earthlink.net] Sent: Tuesday, June 30, 1998 11:18 AM To: seaoc Subject: horiz. diaph. What is the advantage of 1/2"- 5 ply horizontal diaphragm vs. 1/2"- 4 ply, both str. 1? Am I correct in saying the allowable diaphragm shear for a given nailing/blocking is the same but the allowable vertical load carrying capacity (d+l) is different? Regards, Mark D. Baker
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- From: Mark D. Baker
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