What is the quality?
I installed “deadman” anchors, a timber running perpendicular to the wall, with a “T’ at the o-posite end, and a bag of sakrete on top of the “T” where they are spiked together. This anchors the wall so it won’t tip over.
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These nails are too short for your project. I would drill 5/8” holes in the timbers and use 1/2” X 2ft rebar to stabilize them.
I'm just an idiot landscaper so never dawned on me to drill pilot holes. We just hammer them home! Some of my guys need to use the 5lb sledgehammer but a regular hammer works fine. However, your forearm will get tired and I don't allow hammer marks on any visible timber so the pro tip is to leave a little bit (~1/8") up and only finish all the way home after your forearm is rested.
I. Used these as landscape timbers and landsape edging support. They Hold well No,erosion issues as they are in the ground all year
I have used it on different types of plastic/composite edging and never had a problem with the nails coming out or going through.
Not sure I understand your question completely but the diameter of the nail is 3/8" and the flange/head of the nail is slightly bigger
It would work, but it might be some overkill. Staples for this purpose work better because they cover more surface area, but they do not go as deep as the spike.
It would be very tough w/out pre-drilling a pilot hole with a slightly smaller diameter drill bit. You're likely to bend the spike and/or split wood without a pilot hole. You'll also need a drill bit that is as long as the spike