When installing transition strips or T-molding, you generally need to leave an expansion gap that matches the manufacturer's overall flooring requirement, typically ranging from one-quarter inch to one-half inch on both sides of the transition profile. This gap ensures that floating floors have adequate space to expand and contract with seasonal temperature and humidity fluctuations without buckling against the vertical stem of the transition track. The wide top flanges of the transition strip are specifically engineered to overlap this gap completely and conceal it from view.
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