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Unread 03-21-2020, 06:56 PM   #1
SpaceCadet
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nie wieder bohren accessories

I've got a shower caddy from no drilling required (nie wider bohren). This one: https://www.nodrillingrequired.com/1...p/dk240-sn.htm The mounts are attached to tile with adhesive. Sounds good in theory. Is anyone familiar with these? I'm worried it's going to get loaded up with shampoo bottles and either get yanked off the tile or pull the tile off the wall.

Any advantage to putting the mounts on the bottom of a tile instead of the top so it's got less leverage, more shear and less pull? The mortar coverage should be good but I'm paranoid.
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Unread 03-21-2020, 08:43 PM   #2
Tool Guy - Kg
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It doesn’t matter where you mount this in relation to any given tile. Even the lowest performing bonding mortar has a shear strength of 50 pounds per square inch. I’m sure you’ve got at least one square inch of mortar behind the tile and all the combined shampoo bottles weigh less than 50 pounds. Yes, the tensile bond strength is less than the shear, but the reality is that the tile has no chance of falling off if it’s installed even remotely decent.

The question is that of the adhesive that the rack is bonded to the tile. Most important part is that the bonding surfaces are clean-clean-clean. Now, what adhesive did they supply with this gizmo?

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Unread 03-22-2020, 10:05 AM   #3
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The adhesive is some proprietary fancy german goop in a tube. The instructional video cracks me up: https://www.youtube.com/watch?v=r7PA3o9aiB0

I wasn't worried about sheer, I was worried about the tile being pulled. The top shelf is above the mounts so it looks like it would create tension at the mount points by levering about the bottom spacers. Let me just get my statics textbook. I'm sure it will be fine.
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Unread 03-22-2020, 12:32 PM   #4
Tool Guy - Kg
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I know you’re not worried about the shear. But I mention that specifically because we have easy access to the published strength values of them. We don’t have as easy access to the tensile strength values.

Even if you are extremely conservative and say that the tensile strength is only a small fraction of the shear, you still have a very strong bond of tile to the substrate.

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Unread 03-22-2020, 12:46 PM   #5
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Think you'll find the minimum requirements of the Pull Test for that thinset mortar would be 75psi, Goldstein, so your evaluation is quite conservative and more than adequate.

My opinion; worth price charged.
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Unread 03-22-2020, 01:26 PM   #6
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Ok.

So it's settled, then.


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