
The provided search results offer limited information, but they point to one common and effective method for fixing a sagging sofa: using a couch cushion support board. These supports are typically firm, heavy-duty inserts, often made of materials like plywood, which are designed to be placed directly on the sofa's frame underneath the seat cushions. This adds a solid, stable layer that counteracts the sag, restoring a firmer feel and extending the life of your furniture.
To offer a more complete solution, it is important to identify the root cause of the sagging. If the cushions themselves have become compressed over time, you may be able to fix them by adding new stuffing or replacing the internal foam inserts. This can often be done by unzipping the cushion covers.
In other cases, the problem may be more structural. The springs or webbing that support the cushions from within the sofa frame may have stretched, loosened, or broken. This type of repair is more involved and typically requires turning the sofa over to access its underside to tighten or replace the damaged components. For many, however, a support board placed under the cushions provides a simple and immediate improvement without requiring extensive repairs.


