Seeing long vertical cracks appear on new timber posts can be unsettling, but understanding 'checking' is paramount. Checking is a natural cosmetic result of external lumber drying and losing outer moisture faster than its inner core. It is entirely distinct from true structural failures.
Because flat-sawn posts place growth rings parallel to the face, they split violently. Our premium vertical grain natural wood specification aligns growth rings at 60–90 degrees to ensure uniform moisture evaporation. This specialized structural cut guarantees that natural checking remains minor, shallow, and perfectly safe under standard wind conditions and full 60KG/㎡ snow capacities across our entire fleet, stretching from the 8.5x8.5 through the 12x20 .
Red-Flag Warning Signs to Watch For:
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Cracks visible on two adjacent faces simultaneously.
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Deep splits appearing within 6 inches of your base anchor hardware.
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Vertical displacement along a crack line, signaling active foundation shifting.
Minor cosmetic checks under 1/4-inch wide can be treated with clear wood oil or flexible epoxy fillers to lock out winter moisture.
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