My big problem piece is a sofa from the mid-1970s that I haven’t had time to repair or reupholster. To get one more year out of it, I updated the loose back cushions with symmetrical tufting. This is a quick, easy trick that I tried out on a love seat last year with amazing results. You just need a tufting needle, tufting twine and basic sewing skills.
Boxed-back cushions tend to get saggy because the cushion inserts are usually sewn with a baffle straight across the center. The baffle acts as a shelf and keeps the fiberfill from sinking down to the bottom of the cushion. When the filling is new, fresh and unmatted, it looks and feels great. But over time, the filling in the top channel sinks to the bottom of that channel, and the filling in the lower channel sinks to the bottom of that channel.
That’s what had happened to this sofa. No matter how many times I fluffed the cushions, they always ended up slouched down.
Determine the number and spacing of your tufts — I did four, evenly spaced, in the center of the cushion. Then measure and cut a template on a piece of white paper, so each cushion will be exactly the same.