Can you replace traditional springs in a chair seat with zig zag springs?

Q: I have an upholstery question about spring chairs: Can you replace traditional springs in a chair seat with zig zag springs? I do not know who to ask and I cannot seem to find the answer on the internet.

A: Great question I’m so glad you asked. There are a myriad of factors to consider in your choosing, but those 2 options, aren’t the only option!

Zig Zag Springs are most commonly referred to as sinuous springs, or NoSag springs in the industry. This might be why you struggle to find info about it online. Sinuous springs come in various gauges of thicknesses, most common for a chair seat would be 9 gauge. Thinner gauges can be used on seat backs for a squishier experience. These types of springs are attached with metal brackets to the front and back of the frame with nails. They require specialized tools to stretch and attach the springs to the frame. Thicker gauges of springs apply more stretch and pull on the frame. They can sometimes warp and bow the wood over time. If your frame is curved, you may not experience this. They are a cheaper option at about $ a foot, and only require about 6 – 10 ft. for a chair seat on average. They rarely need to be replaced, and typically need string, wire, or spring to help hold them upright. They have more space between them than a traditional spring. This spacing could cause your barrier fabric to fail. Your materials might cut through sooner than the webbing of a traditionally tied spring.

Traditional springs come in the same gauge sizes. Your seat will likely require 5 or more springs to complete the seat. These springs run on average of $4 – $6 a spring. An 8 way tie will create a more tightly woven web across the surface of your seat. It allows for better weight distribution. There will be less space for your materials to cut through over time.

Sometimes however, your frame won’t allow or springs to be replaced at all. Upholstery tacks, nails, and clusters of staples can degrade the frame over time. This degradation may make it difficult for new fasteners to bite. In that case you may have to reinforce the frame, or use jute webbing as your main suspension system. This option will still give you a bouncy seat. However, you will need to use sculpting techniques if you’re looking for a round domed crown on your seat deck.

In short, the material you replace your springs with will mainly depend on your frame’s support capacity. The shape you want to achieve also plays a role. Additionally, consider the budget you are working with. Hope that helps!