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[Friedrich Ernst]

Hi everyone!

I'm currently building an upholstered dining chair and have run into some construction questions around the backrest that I'd love some input on.

My plan is to connect a wooden board to the side frame as the base for the backrest cushion. The backrest should sit at a 12° recline angle — does that mean the board itself needs to be mounted at 12°? Or is it possible to attach it horizontally to the side frame and then achieve the angle through the cushion build-up (foam, Dacron, fabric)?

Also wondering about the assembly sequence: is it better to attach the wooden board to the frame first and then build up the upholstery layers on top? Or is it more practical to construct the full cushion panel separately and then connect it to the frame as a finished unit?

Any advice from people who have tackled similar builds would be much appreciated! Ive attached some pictures to maybe help the understanding.

[Dmitry_CAD]

Hello!

If we're talking about a dining chair with an upholstered back, this is the approach that is typically used in furniture manufacturing.

1. The 12° angle should be built into the frame, not created with foam.

If the backrest is designed with a 12° recline, the structural support of the back (plywood panel, wooden frame, or similar substrate) is usually installed at that angle from the start.

I would not recommend keeping the back panel vertical and trying to achieve the 12° angle solely with foam. The foam thickness would need to vary considerably, the padding may deform over time, and the chair is unlikely to provide consistent comfort and support.

In general, the angle should be created by the frame construction itself, while the upholstery and foam are there to provide comfort and appearance.

What I would do:

Build the 12° angle directly into the backrest structure.

Make the upholstered back as a separate panel (plywood + foam + fabric).

Upholster the panel first and then attach the finished panel to the chair frame.

This is one of the most practical and production-friendly methods and is commonly used in the manufacture of dining chairs, restaurant seating, and upholstered armchairs.