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These may be solid wood, such as a 2x8, an engineered wood product, or a specially designed wood assembly with openings to allow the passage of utility lines through the joists (such as HVAC and plumbing) without damaging the structure.

These may be solid wood, such as a 2x8, an engineered wood product, or a specially designed wood assembly with openings to allow the passage of utility lines through the joists (such as HVAC and plumbing) without damaging the structure.

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