As long as the floor is solid enough to take tile, L360 or better, then slap some stupid plywood on the floor, staple some tar paper and diamond lathe to the floor, and float a mud bed, which is a superior setting bed to any man made product and dead flat and level.
Whether your home is new or old, it is sometimes necessary to install floor joist bracing in order to eliminate squeaking and deflection in the flooring itself. Bracing will stiffen a floor system, prevent floor joists from twisting, and increase overall stability. However, there are actually two
For decks, solid blocking cut from the same size boards as the joists works best. Technically, X-bracing cut from 1x4's and fit in-between the joists in an "X" pattern, or even metal "X-ties", could be used - you may have seen this type of bracing used in homes.
Sistering two joists is usually done to support a heavier load than the one for which the structure was originally built. On the other hand, if an existing joist is decaying, then there is no need to sister a second joist of the same dimensions because the new joist by itself will be sufficient.
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