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Struggling to mount floating shelves on plaster wall

Not sure if this is the right category, but here goes...

Someone help me! I'm trying to hang two small floating shelves on a section of plaster wall. Of course there are no studs were I need them. We were going to use toggle bolts, but after we drilled the holes for the toggle bolts we discovered there's only about 3 cm of space between the back of the lath and the exterior masonry. There's not enough room to put a toggle or a molly bolt in. Is there another type of anchor that might work? What would happen if I used a plastic drywall anchor? Since we drilled a couple 1/2 inch holes where we want to mount the shelves, can we put an other type of anchor in the hole once it's been patched or would the spot be too weak?

Re: Struggling to mount floating shelves on plaster wall

Install a sleeve that is as long as the depth from the face of the Masonry to the finish surface of the Plaster than use a Masonry anchor like a tapcon to secure the shelf to the wall.

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