20 | DIY "Professional" Floating Corner Shelves

Corner shelves are tricky. Most pre-made ones are tiny triangles that hold one candle. I wanted substantial, thick shelves that wrapped around the corner of the living room to hold books and plants.

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The Challenge

1. Strength: A floating shelf has no legs. A corner shelf has weird leverage points.
2. Walls are not 90 degrees: If you cut a perfect 90-degree shelf and shove it in a corner, you will have huge gaps. Drywall corners are usually 89 or 92 degrees, filled with mud.

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The Build Method: Hollow Core

I built these like an airplane wing.

1. Internal Frame: A skeleton of 2x2 strips screwed into the studs.
2. Skin: 1/4" plywood glued on top and bottom.
3. Front: A solid wood face frame to hide the sandwich.

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The Process

Step 1: The Frame

I screwed cleats into the studs on both walls meeting in the corner. I added "ribs" sticking out.

• The Joint: Where the two shelf legs meet in the corner is the weak point. I reinforced this with a metal mending plate and extra screws.

Step 2: Scribing (The Magic Trick)

I cut my plywood top slightly larger than needed. I pushed it into the corner. It hit the bumps in the wall.

• Compass: I took a compass (geometry tool), set it to the width of the largest gap, and dragged the point along the wall while the pencil drew on the wood.
• The Cut: I used a jigsaw to cut along that squiggly pencil line.
• Fit: When I pushed it back in, it fit the lumpy wall like a glove. Zero gaps.

Step 3: Skinning

I glued and brad-nailed the plywood skins to the frame. I glued the solid Poplar face frame on the front.

Step 4: Paint

I caulked the seam against the wall (painter's best friend) and painted them white to match the trim.

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Conclusion

They look like they grow out of the wall. Because they are screwed into multiple studs on two different walls, they are incredibly strong. You could do pull-ups on them (I didn't, but I could).