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Not very thick. Many building codes (perhaps most) allow 3/4 inch waferboard or 5'8 inch plywood as the structural subfloor over 16" O.C. joists.
This is fine for normal sized floors with carpet or vinyl overlay, but is insufficient for very large floors or floors to be finished in ceramic, slate or porcelain tiles.
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∙ 14y ago
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1"
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