Structural Comparison
A traditional 3-seater sofa with a continuous frame is stronger than a modular configuration of the same dimensions because the structural loads travel through a single integrated frame. Modular sofas divide structural load across individual pieces connected by hardware — the connector hardware is therefore the critical stress point. Quality modular systems use steel-pin or cam-lock connectors that hold adjacent modules within 1–2 mm of vertical alignment under 100 kg loads. Low-quality modular systems use plastic clips that allow 5–10 mm of vertical movement — this is visible as uneven seam lines and is a comfort issue (the user can feel the boundary between modules in the seat).