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That approach works when long-term durability isn't a priority. However, if you want a surface that holds up over time — one that won't shift or peel up as the building settles or moisture collects — gluing the underlayment down produces a more stable base. A plywood underlayment also adds rigidity to a subfloor that flexes or bends, giving your finished floor a firmer foundation.",[65,66,68],"h2",{"id":67},"step-1","Step 1",[46,70,71],{},"Begin in the corner of the room that is furthest from the door, placing your first plywood sheet there. Verify the squareness of the board using your carpenter's square. Plywood sheets aren't always perfectly square, but for the initial piece it's best to pick one that's reasonably true. Keep a gap of 1\u002F4 to 1\u002F2 inch between the boards and the walls to allow for expansion.",[46,73,74],{},"When the subfloor is made of plywood, run the underlayment perpendicular to the first plywood layer. 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