Larch - highly resistant timber with a high level of protection. Exclusively, larch terrace boards are without deep impregnation. Antiseptic can't completely soak through the sapwood because its structure is very dense, so it is impregnated only on the superficial way. However, because of the dense and resinous structure, larch has an unpleasant feature - the surface is "bristle up", so you should be careful to avoid splinters.
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