T-molding is not always strictly necessary between every room, especially if you are installing continuous flooring of the exact same material without interruption across multiple spaces. However, T-molding becomes necessary when transitioning between different flooring materials of equal height, when switching the direction of flooring installation layouts, or when spanning large open areas where manufacturer guidelines require an expansion break to prevent buckling. For continuous flooring runs under a standard doorway, omitting T-molding creates a sleek, modern look, provided the space stays within maximum recommended span limits.
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