Budget sectionals often deteriorate within eighteen months due to sagging, low-grade seat cores. The Saltsjöbaden avoids this through its cushion foam density specifications. IKEA engineers paired heavy-gauge sinuous steel zigzag springs with cold-cured, 32 kg/m³ to 35 kg/m³ high-resilience polyurethane foam, wrapped in a polyester fiber batting wrap. The result offers medium-firm support: initial seating yields around 1.5 inches of compression before the core pushes back firmly.
IKEA sofa frame durability centers on a hybrid internal skeleton. High-stress points, such as corner joints, armrest fixings, and central rail mounts, use solid birch, pine, and structured plywood. Non-load-bearing infills use medium-density fiberboard. The structural joints resist diagonal racking during heavy weight transfers, offering a 240-pound dynamic weight capacity per seat section.
Upholstery options undergo standardized Martindale method testing to measure abrasion resistance. Saltsjöbaden fabrics rate between 30,000 and 40,000 rubs:
- 15,000 Rubs: Minimum standard for light, occasional residential use.
- 30,000 Rubs: Heavy-duty commercial/residential baseline, resisting thinning and pilling from daily wear.
- Saltsjöbaden Rating (35,000 Rubs): Built to handle family use, friction from denim, and claws without surface degradation.
