Red Birch and Yellow Birch wood flooring are from the same tree. The yellow is the sapwood (outer portion of the log), and the red comes from the heartwood (the center of the log). Red Birch carries a premium since the log yields much less of it than the yellow. The Natural grade allows for some of the yellow and an occasional knot, but it’s mostly red and it’s protected with with a silky low gloss finish. This is a solid prefinished wood floor milled with microbevels and a smooth surface. It’s suitable for above grade installations, and can be nailed, or glued with the appropriate mastic. The finish has a limited twenty five year residential warranty. The supply is limited at this price.