But we asssumed that the 8d nail from the diaphragm tables was into 2x lumber which means there is an edge distance reduction factor in the 8d nail vs. MMC Engineering RE: Roof Diaphragm - Sheathing over T&G decking msquared48 (Structural) 20 Sep 09 22:17 Note that there are two reports - ICBO Research Recommendation #2964 and #1379. GALLONS AND LARGER - NOT INTENDED FOR CONSUMER SALE OR USE. 2964 for attaching plywood sheathing to support members prior to nailing in accordance with Chapter 25 of the Uniform Building Code. of Potlach Corp.) Laminated decking, roofing andįlooring system or equivalent to I.C.B.O. 1379 concerning diaphragm construction when using "Lock-Deck" (Reg. Meets the requirements of plywood fabricator service specification AFG-01 and complies with the provisions of FHA "Use of Mateirals bulleting UM-60". Product Catalogue for Maintenance and Repair (MRO) Solutions Adhesives 3M™ Miscellaneous Adhesives 3M™ Scotch-Grip™ Wood Adhesive 5230ģM™ Scotch-Grip™ Wood Adhesive 5230 Printer-friendly format Appeared to be an Australian site, but it seems like it is still around. RE: Roof Diaphragm - Sheathing over T&G decking OldPaperMaker (Structural) 20 Sep 09 15:52įound this by googling Scptch 52130 Adhesive. You could use an acrylic adhesive, I'm just not sure you can get the strength you want without creep though for diaphragm action, the load is not continuous so it probably doesn't matter. Solvent cured adhesives will maintain an odor longer than epoxy. Adhesive fastening will cut down on squeaking that you'll get under load.Īs for the adhesive, I would suggest an epoxy, since it is not solvent cured. Automated screw guns work well for large areas. You can, obviously, get the screws in any length you want. I'm not sure how much area you have to deal with, but you might consider screws instead of nails. I would agree with both mechanical and adhesive fastening. All of the Eval Rpts on adhesives apply to manufactured panels that have separate Eval Rpts. Mike.I searched the Evaluation Reports but didn't find anything on that adhesive under either "Scotch" or 3M. JAE.I couldn't find anything that helped with code approval on adhesive use for this, but didn't find anything against either. What have any of you done with respect to this? RE: Roof Diaphragm - Sheathing over T&G decking msquared48 (Structural) 19 Sep 09 17:14 Is there a specific technique that shows how to do this? The IBC states that we can use the NDS nail capacities and manually calculate diaphragm shear capacities from them. Is the sheathing considered as "blocked" under the IBC diaphragm capacity table? If we use the 8d nailing with 1 3/8" required penetration, there is no standard length of nail that works - 8d or 10d nails are too long and would poke through the decking - ticking off my architect. and thus there are no roof members spaced at 16" or 24" o.c. The IBC recognizes the sheathing but specifies nailing on the "supports" - edge nailing and field nailing. I've heard in the past that placing Structural I plywood or OSB over the top of the decking can provide the necessary diaphragm action. The IBC doesn't recognize 2x tongue and groove decking (we have 2圆's) as providing roof diaphragm shear behavior. There's been one other post before this on this topic ( thread507-106592: T&G Decking as diaphragm) but we just faced this situation and I thought I'd ask out there if there are further comments or input.
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