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So did my engineer. Thanks, Jim

I had the engineer check it out. We are using 4 Simpson SDS screws per stud. I also came across some information regarding deck attachment failures in Colorado. It seems that the 16d nails that everyone specifies have little holding power (although I am sure they have the shear originally)...

I am having an engineer check it out using 3/8" lags and Simpson bolts. Jim

I know a contractor who installed the anchors without having a building inspector on site in a commercial building. He was required to hire a testing lab to test them on site. They all checked out okay but it did cost. I believe PSI was the testing lab. Jim

Bottom line--do you feel that this approach is defensible over say post and glu-lam beams? Jim

VPJ You mentioned a concern about the placement of the bolts. An article from California Falsework manual Suggests a minimum spacing of bolts in a row to be 4D (diameter of bolt) with end distance at 7D from either end when in tension or compression. They also have an adjustment factor for...

You are right on this one. A contractor friend pointed out that if you use a larger ledger the compression on the drywall is going to be much less of a factor. In addition he says that he finds lag bolts much preferable to nailing due to the fact that the withdrawal value on lag bolts is much...

Oops, it should go From interior to exterior it has 5/8 type x gyp, 2x6 Studs, 1/2" plywood sheating, 5/8" gyp exterior sheating, Hardi-Panel 3/8" panel.

I should note that the interior wall where the attachment goes is 5/8" type x gypboard. From interior to exterior it has 1/2 gyp, 2x6 Studs, 1/2" plywood sheating, 1/2" gyp exterior sheating, Hardi-Panel 3/8" panel. Did your calculations on the 1/2 lag at 220 lbs per lineal foot take into...

Thanks for your response. The ledger is 1 1/4" and the depth is variable to around 16". The wall is 1 hour fire rated 2x6 with 1/2" plywood covered by 5/8" exterior fire rated sheating with Hardi Board siding. I was thinking of using 6" x 1/2" plated lags. A friend suggested I use Simpson...

In talking with the engineer he acknowledged that although there is nothing made there is a demand for a fastener that would work with gyp board or sheathing. The only cantilevered fastener system was their ICF Ledger Connector System made for foam filled concrete walls. Probably the only...

Will do. We have contacted them regarding venting and found them to be helpful as well. Jim

Common sense would tell me that even given the offset three 1/2" x 5" lag screws into a stud through LSL ledger and 5/8 gyp board would be better than 3 16p nails through the LSL ledger into the same studs. However, I am not finding much to support it. Jim

I found Simpson Strong-Drive information at http://www.strongtie.com/products/connectors/strong-drive-screw.html My lbs per lineal foot on the mezanine is 660. Sounds like three rows into 2x6 studs at 16" oc would accomodate this quite well if not the ability to adjust for the bending factor...

To give you an example of what I am talking about see http://www.bestdecksite.com/introLedgerPg1.htm. See also http://www.blackanddecker.com/projectcenter/ProjectDetail.aspx?DOC_ID=p_2_102_23914_23934_23983.html http://www.saradec.com/DeckManual/layoutd.htm It looks like there might be a lot...

To give you an example of what I am talking about see http://www.bestdecksite.com/introLedgerPg1.htm. Jim

You are probably right and it is tempting to just say that the drywall has to be removed for attachments. I believe that the concern was to set up a situation where the mezanine could be easily removed for a future tenant. The main concern was to make something that would be more easily...

I believe that the lag bolts could add enough additional holding power to compensate for the distance of 5/8" and the fact that drywall has no load bearing capability. The compression afforded by the lag bolts and the fact that they would have much more bearing capacity than 16p nails could...

Although it would be quicker I think that the lag bolts would be better. It still seems to me that a long lag bolt through the ledger (1 1/2" x 12") and the 5/8" drywall would have bearing capacity since the anchoring would be in the 2 x 6 studs (16" on center). In my case cutting through the...

Thanks for your quick response. If the drywall is removed it seems like the lag bolts would be a better anchor than 16p nails. What size would be appropriate through an 1 1/2" ledger? Also, could one support a 3/12 glue lam ledger at intervals, attaching with lag bolts to the wall through the...