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I'm building a 4x6' dance/jumping floor for my exercise room. The purpose is to save wear and tear on my joints during the higher impact exercises.

The design is a sheet of plywood on top of sprung sleepers. The sleepers are 3/4" thick by 2" wide. The sleepers are laid in a "basket weave" pattern, which just means that every other layers is offset. The result is that each layer of sleepers springs on top of the layer below it.

The pictures might tell you what I'm doing.

Anyway, the design asks for Spruce sleepers, but I got some cheap Fir, which I'm using for my first iteration. My question is, if I buy some of the more expensive Spruce, do you think that will have better properties as far as spring rate?

(ps. The top plywood layer will be maple in the final iteration.)
 

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Red Seal Electrician
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Depends on the spruce and fir species. Sitka spruce and Douglas fir are especially resilient. Other spruces and say balsam fir... not so much.
 
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