I’m looking for help on a very specific problem. I’m making a wall-hung bookshelf. So, it will be supported entirely by fasteners in the wall with no support from the floor and no connection to the ceiling.
The walls do not have studs. Instead, there is 1950’s wallboard on 3/4″ furring strips and the furring strips are on cement block. The shelves must go in a very specific location, are about 30″ wide, and the furring strip spacing is approximately 15″ on center, although the shelf will be in the vicinity of a window and a corner, so things may be oddly spaced, especially since it is junky 1950’s US construction. The point is that you cannot count on there being any more than two furring strips behind the shelf and they may not be centered. Actually, you could end up with only one strip.
My estimate is that the shelf plus load will be about 210 lb. If I later add doors, that will be yet more. Let’s just call it 400 lb.
So, how to hang this thing? I’m going to build the shelf, so it can be designed with hanging in mind. Right now, I’m thinking of a French cleat, but I’m really not even sure about the fasteners. If you hit a furring strip, the best you can get is 3/4″ of wood for the fastener, and that’s not enough, I think. If you try to use a drywall anchor, you’ve got about 5/8″ of drywall and a 3/4″ gap behind it before the anchor would be impeded by the block. Maybe, but seems on the edge.
I know from prior experience that this block will *not* take tapcons, but they *will* take cut nails and AJs. So, I’m thinking of attaching a French cleat with cut nails. The problem is that there’s about 1.5″ of drywall and air gap before I hit the wall, so even with a 4″ cut nail (the largest I see), I’m wondering if it will hold. Construction adhesive would help, but this needs to be reversible by just patching a few holes.
Any ideas? Big toggle bolts?
- This topic was modified 5 months, 2 weeks ago by Ed.
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