Naturally, if you want a temporary anchor so you can get it out and do a glue in, those points are not germaine. My belief is that we should try to use only stainless steel as well. I believe Home Depot carries Simson brand, and they are ICC rated. We should be precise in our language concerning such things. If you are calling something which is a generic Chinese made wedge anchor a Redhead, but it's not made by Redhead, then that's bullshit. Thus, if you are buying Redhead brand, then you are good to go. Climbers should be using rated product when possible. This service was developed for the building trades as it turns out that no one wanted under rated or fake weak ass product to fail and kill thousands of people. Any wedge anchor you install should be ICC rated. Most of us use the classic wedge anchor style with great success, but we generally have super hard rock. Guys use 5/8" drilled angles epoxyed in for soft sandstone and claim it outperforms wedge anchors. Might touch base with locals and see what they like doing. non-PT) 4x4s, it was only one location I looked at, however, I'm sure they exist either at HD, a local lumber store, or one further away.Depends on the sandstone. As for Home Depot not having regular (i.e. it would be use to "catch" the threaded rod should the 4x4 splits in half. Thinking more now about a 2" x 10", washer/nut, and then a 4" x 4" on top of that with coupling nuts, but, the nuts on the 2x10 wouldn't be very tight. Initially I planned to use the 4" x 4" only, but I look at the cracks on the legs for my workbench and visualize the 4x4 splitting in half and the threaded rod falls out. Now I'm just trying to think more about wood that will distribute the weight and not split. The main question seems to be answered and that is PT wood will not harm SS threaded rod (or any SS hardware). My other thought is to get 1/4" aluminum, maybe 4" x 6" piece, and use it as a "washer". In any case, my thought was to go with a piece of strut across the wood to spread out the force, but the strut is expensive. My attic has pull down stairs, and, with the right angle, I'm sure I can fit that up there. This is a good call, but I shouldn't have an issue as the beam will be long enough to catch about five joints (six-feet or so) - but certainly something to consider. Someone mentioned the beam length and possibly being unable to fit it up the attic. I haven't had a chance to read through everything until today. Since I just realized the previous application was zinc plated, it seems maybe the white residue doesn't apply to this situation. My thought is to maybe go with wider than 4", however, the part I wanted to rule out was stainless steel bolts and PT wood combination being an issue. The reason I may not go PT wood is due to concern over the 4x4 developing a crack and splitting over time. I plan to drill a hole directly through a 4x4 horizontally laid across joists, and the threaded rod directly through with a nut (probably a coupling nut for extra strength) on top to hold it. The reason I state I'm not certain yet on whether I'll use PT wood: the application is 3/8" SS threaded rod suspended vertically. Remembering the white residue on the bolts from a few years back, and thinking they were stainless steel, I began wondering whether I shouldn't use PT wood. My current need is using stainless steel through (most likely) PT wood, I wanted to confirm the research I did confirmed the new chemicals used for PT wood is safe for stainless steel. It was only in the wood for about six-months (maybe less), and, when I removed them, they had residue that had me question whether they were getting corroded possibly failing over time. What I remember was the bolt had white residue. Description: Medium-Strength Grade 5 Steel Hex Head Screw, Zinc-Plated, 1/4"-20 Thread Size, 5-1/2" Long, packs of 25. The bolts I used were from McMaster-Carr (part number: 91247A564). Apparently I used zinc-plated steel bolts and swore they were stainless steel (all the other hardware such as nuts and washers were SS though). Thankfully I saved the product spec sheet (and receipt) for the hardware I purchased to build the workbench and apologize. They were PT 4x4s (purchased from a lumber store, not Home Depot or Lowe's) being used to build the legs of a workbench. I'll check if I still have the bolts, but, what I remember: the wood was relatively new, maybe purchased in 2015. I guess it would be this version of safe.
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