New answers tagged anchor
1
A French Cleat is a piece of wood (or metal) that runs most or all of the width of the object to be hung. It is installed on the surface of the wall, sized to hide behind the object being hung. Unless you're hanging a mirror that's less than 16" wide and the only place you can hang it happens to be exactly between two studs, some place on that cleat ...
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It's marginal, but these anchoars are strong in shear (where the force is across the screw instead of pulling outwards on it).
I'd use longer screws if I had any on hand but otherwise these will work alright.
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I think you may have some difficulty drilling deeply enough into the concrete behind the wallboard without making the wallboard portion of the hole too large. That will leave very little of the insert there to "bite" into the concrete.
I recommend you get some longer wall anchors and screws that will allow you to get the majority of the anchor ...
1
Throw the red shields out and get some metal lag shields at your home store similar to the one below but the correct size.
3
Since you mention these come with floor safes, I'm going to guess that you're using these to anchor something.. a safe, perhaps.. to the floor. I'll also guess that the objective in anchoring the safe to the floor is to prevent the safe being lifted and carried away.
These plastic anchors seem like they're semi-acceptable for a shear application such as ...
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It would be important to find out if the entire column is rigid foam, or if it has a wood/steel/concrete/plastic core. If it has a core, you can use whatever type of fastener is ideal for that material (and long enough to penetrate the foam layer).
If it is truly rigid foam all the way through, you might consider drilling a hole and then using a molly ...
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