You can pour self-leveling compounds over wooden subfloors, provided the subfloor is structurally rigid, reinforced to prevent flexing, and prepared with a specialized wood-compatible primer and metal lath if required. Because wood subfloors flex under weight and expand or contract with humidity changes, standard self-leveler can crack unless a flexible, fiber-reinforced formula designed specifically for wood substrates is used. Additionally, all gaps, seams, and holes must be completely sealed with tape or caulk to prevent the expensive liquid compound from leaking through the subfloor into the rooms below during the pour.
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