Have you tried a sofa saver?
https://www.amazon.com/LAMINET-Sagging-Furniture-Cushion-Improved/dp/B07GHX2M35/ref=asc_df_B07GHX2M3...
DeKay
https://www.amazon.com/LAMINET-Sagging-Furniture-Cushion-Improved/dp/B07GHX2M35/ref=asc_df_B07GHX2M3...
DeKay
Good Music Couch (Sofa)
Have you tried a sofa saver? https://www.amazon.com/LAMINET-Sagging-Furniture-Cushion-Improved/dp/B07GHX2M35/ref=asc_df_B07GHX2M3... DeKay |
I used a wood/string mat (think heavy gauge sushi mat) on a 3 seat sofa 25+ years ago with excellent results. The product linked was simply to show the concept. Currently I would probably try corrugated plastic or plastic-cardboard sheeting for starters and/or the closely spaced cloth connected thin wooden slats supplied with cheap beds/mattresses. You could also experiment with heavy duty corrugated paper from shipping containers. Something supportive, but somewhat compliant is the ticket, IMO. I worked for Kneedler-Fauchere for over a decade in the 80's/90's and part of my duties involved writing showroom tutorials for their "custom" furniture vender lines. DeKay |