How to Fix Sagging Couch Cushions with Polyfill
Sagging couch cushions are a common sign of wear that can make even a high-quality sofa look tired. The primary cause is the breakdown of the original internal filling, often polyester fiberfill (often called "polyfill") or foam, which loses its resilience over time. Refurbishing the cushions by adding fresh, high-quality polyfill is a cost-effective, durable, and straightforward DIY solution that restores comfort and appearance without replacing the entire cushion.
Assessment and Preparation
Before you begin, confirm that the cushion cover is in good condition. If the fabric is heavily stained, torn, or has significant pilling, address these issues first. For covers with embedded pet hair, a thorough vacuuming with an upholstery attachment is essential. Many professionals also recommend using the best rubber brush for pet hair on sofa fabrics; its stiff, dampened bristles gather loose hair and lint more effectively than standard tools before you open the cushion. If the outer fabric shows signs of pilling, carefully how to use fabric shaver on sofa cushions to remove pills and create a smooth surface for re-assembly. Note: This polyfill repair method is for fabric or microfiber sofas. If you have a dry leather couch, sagging typically indicates internal structure failure, not filling. In that case, consult a leather specialist and learn how to condition dry leather couch surfaces separately to maintain the hide's integrity.
Tools and Materials You Will Need
- High-loft, resilient polyester polyfill (available in bags by weight)
- Seam ripper or small, sharp scissors
- Hand needle and strong thread (matching the cushion's stitching if possible)
- Fabric glue (optional, for securing the final closure)
- Measuring tape
- Scissors for trimming polyfill
- Rubber gloves (to help pack the fill tightly)
Step-by-Step Refurbishment Process
1. Remove and Open the Cushion Cover
Carefully turn the cushion inside out. Locate the longest, least visible seam-often the side or bottom seam. Use the seam ripper to gently undo the stitching along a 12-18 inch section. Do not cut the fabric. Your goal is to create an opening large enough to access the inner chamber.
2. Remove Old, Compacted Filling
Reach into the opening and pull out all of the existing polyfill. It will likely be in dense, matted clumps. Dispose of this old material. As you work, shake out the cushion form to remove any accumulated dust or debris.
3. Add New Polyfill Strategically
Take your new, fluffy polyfill. The key to preventing immediate re-sag is to overstuff the cushion initially. Polyfill will settle and compress over the first few weeks of use. Begin by tearing off chunks of fill and pushing them deep into the corners and edges of the cushion form, using your gloved hands to pack it firmly. Work your way across the entire surface, ensuring the fill is distributed evenly but packed tightly. The cushion should feel noticeably firm and return to shape immediately when pressed. A good rule is to use about 25-30% more fill by volume than the original amount you removed.
4. Test and Adjust
Before closing the cover, gently press on the filled cushion form. It should feel resilient and supportive. If any areas feel soft, reach back in and add more polyfill. The goal is a uniform, firm feel.
5. Close the Opening Securely
Align the seam edges inside the cushion. Hand-sew the opening closed using a strong, tight running stitch or a backstitch for extra durability. For an invisible finish on the outside, push the seam edges inward as you sew. You can add a thin line of fabric glue along the inside seam before sewing for a permanent bond, but ensure it dries completely before reinserting the cushion.
Reassembly and Final Touches
Once the cushion is re-covered, place it back on the sofa. Sit on it and press down to help the new fill settle evenly. The cushion will feel very firm at first but will soften to a comfortable, supportive level within a few days of regular use.
Maintenance for Long-Lasting Results
To prolong the life of your newly refurbished cushions and the entire sofa:
- Rotate and flip cushions weekly to promote even wear.
- Vacuum regularly with an upholstery attachment to remove dust and debris that can break down fibers.
- For fabric covers, address pilling early with a gentle fabric shaver.
- Keep sofas out of direct, prolonged sunlight to prevent fabric and fill degradation.
- If you have pets, use the best rubber brush for pet hair on sofa surfaces daily to minimize embedded hair that can strain fabric.
A well-maintained sofa, with cushions periodically refreshed using quality polyfill, can provide a decade or more of comfortable service. This simple repair embodies the core principle of home economics: extending the life of valuable assets through skilled, informed maintenance.
More tips in the section Interior Longevity & Multimedia Care