A Traditional Drop-In Seat

The project

A drop-in seat (slip seat) is a separate padded frame that sits inside a chair’s seat rails, common on dining chairs. Traditionally it’s upholstered without springs: webbing, burlap, hair, cotton, muslin, and cover. It’s the best first traditional project - small, quick, and it teaches webbing, stuffing, and covering. (The Chairs course has a modern version with plywood and foam.)

The build

1. Strip the old seat and repair the frame (see Stripping and Frame Repair).
2. Web the top of the frame: with no springs, the webbing goes across the top and carries the stuffing directly. Space strips close together, interlace them, stretch tight, and tack with the fold-back method ¹.
3. Burlap over the webbing, tacked with 8-ounce tacks, edges folded back ¹.
4. Bridle ties stitched into the burlap ².
5. Hair stuffing: tease curled hair (or coir) under the bridle ties into an even, slightly domed layer that stops short of the outer edge ¹.
6. Cotton over the hair, torn to feather the edges ¹.
7. Muslin: pull it over and fasten on the underside of the frame, centers first, pulling with the grain and using many small tacks ¹.
8. Show cover: the same centers-and-opposites method, corners pleated or folded neatly ¹.
9. Dust cover of cambric underneath ¹.

For a more structured seat, fine work adds a stitched edge in scrim around the front and sides.

Fit

The finished seat has to drop into the chair with fabric wrapped around it. As you go:

• Keep stuffing off the outer edges of the frame.
• Fasten muslin and cover on the underside, not the edges.
• Account for fabric thickness; heavy fabrics need more clearance.
• Test-fit in the chair before final fastening of the cover; if it binds, trim stuffing at the edges or refit the cover.

What to take from this

A traditional drop-in seat has webbing across the top of the frame, burlap, bridle-tied hair stuffing, cotton, muslin, a show cover, and a dust cover, all fastened on the underside so the padded seat still drops into the chair. It teaches every unsprung technique in a small, forgiving project.