Fire-retardant oriented strand board

A method of forming a flame-retardant oriented strand board, the method comprising,

• applying an aqueous solution comprising a solvent comprising water and a water-soluble flame-retardant having a solubility in water of at least about 400 g/L that is not water present in the aqueous solution in an amount of about 40% by weight or greater to a first furnish;
• and
• applying a flame-retardant powder to the first furnish;
• wherein the first furnish is configured to form an oriented strand board without an additional drying step;
• wherein the oriented strand board comprises at least one inner layer and at least one outer layer, and wherein said layers are subjected to compression employing at least one adhesive to form the oriented strand board.