I took a non-permanent approach and used two wire rolling carts (wheels removed) to create shelf space in my closet. The narrower cart (with its bottom shelf removed) sits on a piece of plexiglass (left over from redoing the
fridge door) on the bottom cart's top shelf. The plexiglass prevents the legs from falling through the spaces, and helps me see what's sitting in the back of the bottom cart's shelves. Carts are readily available at discount and big box building supply stores.
I also zip-tied a length of PVC pipe (another leftover from making kayak dollies) to the bottom of the top shelf of the top cart. This gives me a small amount of space to hang my rain jacket. This floor-to-ceiling space can also hold
awning poles, broom and other long/tall objects.
I've seen pics of people using PVC pipe to construct a framework that sits snugly in the closet, then plywood shelves placed on top. I thought that was pretty clever, with no need to drill holes in the
fiberglass wall.
I do like the idea of cutting an access through the floor of the closet to get to the unused space below.
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Lil M.
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“When one tugs at a single thing in nature, he finds it attached to the rest of the world.” ― John Muir