Bottom Plate Requirements for Double-sided Plywood Wall Bracing Units

Consulting engineers commonly specify double-sided plywood bracing units when there is insufficient width for single-sided bracing, a situation frequently encountered in modern buildings with large openings.

AS1684-2:2021, clause 8.3.6.5, clearly states that where plywood units from Table 8.18 (g), (h) and (i) are fixed to both sides of a wall, the bracing capacity is double that of a single sided unit; the depth of the bottom plate shall be a minimum of 45mm and, the tie-down of the bracing wall shall be double that of a single sided unit or in accordance with clause 8.3.6.10 for the increased capacity.

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