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<blockquote data-quote="RDFF" data-source="post: 1659735" data-attributes="member: 39018"><p>The 1 1/4" solid rod I use for line posts do pretty well when I hit a rock, generally will slide off to one side or another without damage. They're very tough, don't shatter, but will mushroom the bottom end a bit I expect if you were right on top of one. If you're in solid shelf rock, like shale, I'd guess you'd be better off with steel though. They would be able to shatter right through that, especially if you've got a "vibrator type" of power driver, but I'm pretty sure that these wouldn't.</p><p></p><p>The ones I use for H braced post sets would be more difficult in/on a fairly solid rock... they can shatter the end against the rock... so steel again there would be better if you're wanting to drive them in. </p><p></p><p>I do drive them all in, (1 1/4's with a regular T post driver by hand, end posts with a Shaver hydraulic post pounder) but I've not got a solid rock base here, just plenty of granite rocks buried in the dirt, left by the glacier they tell me. If I hit one that's pretty solid, I stop and move the post a foot or so to find a more rock free spot. U of MN did a boring on my farm a couple years ago.... 120' to bedrock, mostly glacial till. About 10'+ of A/B horizon... so not much to be concerned about when putting posts in.</p></blockquote><p></p>
[QUOTE="RDFF, post: 1659735, member: 39018"] The 1 1/4" solid rod I use for line posts do pretty well when I hit a rock, generally will slide off to one side or another without damage. They're very tough, don't shatter, but will mushroom the bottom end a bit I expect if you were right on top of one. If you're in solid shelf rock, like shale, I'd guess you'd be better off with steel though. They would be able to shatter right through that, especially if you've got a "vibrator type" of power driver, but I'm pretty sure that these wouldn't. The ones I use for H braced post sets would be more difficult in/on a fairly solid rock... they can shatter the end against the rock... so steel again there would be better if you're wanting to drive them in. I do drive them all in, (1 1/4's with a regular T post driver by hand, end posts with a Shaver hydraulic post pounder) but I've not got a solid rock base here, just plenty of granite rocks buried in the dirt, left by the glacier they tell me. If I hit one that's pretty solid, I stop and move the post a foot or so to find a more rock free spot. U of MN did a boring on my farm a couple years ago.... 120' to bedrock, mostly glacial till. About 10'+ of A/B horizon... so not much to be concerned about when putting posts in. [/QUOTE]
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