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ValidGarry t1_jbld188 wrote

Loadspreading would give you peace of mind without structurally altering the floor or ripping it up. Rather than 2 x 12, you might look at ripping some sheets of ply to 24" strips and putting them down. Since you want to spread the load wider, going up from 12" would give better results. 12" would probably work, but spreading is spreading and wider is better.

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nalc OP t1_jblqdpe wrote

Hm, that's a decent idea. 3/4 T&G plywood cut into 2 ft x 4 ft strips and nailed down with the joints over the joists would be quite easy to install.

Any thoughts on OSB vs real plywood?

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