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April 14, 2:55 PM [GMT -5]

My kitchen cabinets are sagging on the bottom shelves where the shelf was just stapled onto the lower rail.The bottom shelf is only a 1/8" sheet of panel which was stapled into place. Cheap but it worked --till now anyway.
I plan to glue a piece of 1x1 or 1x2 wood underneath so it will support the shelf. To ensure its level, I'll clamp the wood in place in the front and use a T-post of wood at the back, which will be shimmed into place so it's solid. Once the glue sets, I can remove the supporting clamps.

In the cabinet under the sink, the bottom shelf (1/8" panel) has sagged over the years due to dripping water from the sink sprayer. I plan to use my multi-tool to cut out a 3/4" slot in the baseboard, then insert a 1x? piece of wood ripped to the correct height to eliminate the sag. I'll use construction glue to keep it in place. When done, I'll paint the end so you can't tell it's there.

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How to Fix Sagging Cabinet Shelves

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