My sofa cushions keep sagging after a couple of years, so before I replace them again — what is the best foam for long term sofa wear?
The best foam for long-term sofa wear is usually high-resilience (HR) high-density polyurethane foam.
It offers strong support and quick rebound, making it more resistant to sagging and wear than standard foam.
With normal use, it can last around 8–15 years. For seat cushions, a density of at least 40 kg/m³ (about 2.5 lbs/cu.ft.) is recommended.
If the sofa gets heavy daily use, pets, or higher weight loads, choosing a higher-density, medium-firm foam will provide better durability.
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