The provided search context was not relevant to the question of how to fix sagging couch springs. Based on general knowledge, repairing this issue typically involves accessing the spring system from underneath the sofa.
To begin, you will need to turn the couch over to expose the underside. You will likely find a fabric dust cover stapled to the wooden frame; carefully remove these staples with a flathead screwdriver or pliers to reveal the springs and internal structure. Once inside, inspect the spring system. The most common type is a series of S-shaped metal pieces known as serpentine or zigzag springs, which run from the front to the back of the frame and are held in place by metal clips.
Often, sagging is caused by a broken or bent clip, which allows the spring to detach from the frame. If this is the case, you can use pliers to remove the damaged clip and install a replacement, securing it to the frame with screws or a heavy-duty staple gun. If the spring itself is stretched or has lost its tension, you can add support by using strong upholstery twine. Weave the twine across several springs, tying firm knots to link them together. This creates a more rigid support web and helps distribute weight more evenly, reducing the sag.
For a less invasive and quicker solution, you can place a firm support board, such as a thin piece of plywood cut to size, directly under the cushions. This doesn't fix the underlying spring issue but provides a solid base that counteracts the sagging, immediately improving the feel and appearance of the sofa. After any internal repairs are complete, you can reattach the dust cover to the frame using a staple gun to finish the job.
