Quality Upholstery Takes Guts
Updated: Aug 27, 2020
The upholstery trade as a craft evolved throughout many centuries and various eras as it gradually integrated into the furniture making process. While stages of comfort levels increased, tradesmen provided materials for the covering of chairs, seats and sofas.
The coordination of padding, springs, webbing, fabric and/or leather materials covering a wood frame or platform is the essence of this artistic skill. Fabrication of seating furniture requires design aesthetic with the essential components of comfort and function.
Unlike residential seating, hospitality/commercial standards require materials with greater durability to withstand the environmental stresses of continuous daily use. This includes heavy-duty hardware, thicker wood frames, greater density of foam and more resilient fabrics.
The following are the underlying components holding to industry standards for hospitality and contract seating.
Upholstery frames should be constructed with thick, kiln-dried hardwood. The joinery of the frame is critical to durability and appearance; quality construction includes double doweled or mortise and tenon joinery, glued, with corner blocks screwed to the frames for solid longevity. Fitted corner blocking is an essential component in enhancing stability and prevention of loose joints.
“Equally important, we are enhancing our commitment to American craftsmanship. While remaining committed to foreign manufacturing, we are adding resources here to better serve customers and allow us to develop our next generation workforce,” says Lawrence Chalfin, President of Samuelson.
Jute webbing is created of a fibrous, burlap-like material whose main function in upholstery is to provide a foundation for the seat and/or back. Strips of jute are attached to the frame in a basket weave fashion in support of coil springs. Because there is no elasticity in the jute, this type of webbing offers structural integrity to coil spring construction.
Other types of webbing include Pirelli or rubber/cord types. These webbing systems provide flexibility due to elasticity (rubber) with reinforcement and resilience (cord) and offer excellent alternative for support in models that can not accommodate eight way hand tied. In addition, this strong functional suspension is commonly used in lieu of sinuous spring for seating with low profile or tight or slip seat design.
Eight-way hand tied coil spring suspension is the most labor intensive and represents the mark of highest quality. Numerous coil springs are supported from underneath with jute webbing and secured to one another with string, tied by hand, touching each spring at eight different points. The string eliminates shifting of the springs for even suspension and most comfort.creative designs with precision on a larger scale” says Michael.
Sinuous spring suspension is an alternate system of two dimensional, zigzagging pieces of metal secured in rows, cross tied to each other, then to the wooden frame from front to back for strength and resilience. This method provides consistent quality throughout the seat surface, and is often used in back areas of upholstery. This is a common solution when there is not ample room for coil spring construction. Sinuous suspension is less labor intensive, therefore less costly.
Not recommended for high quality hospitality use are drop-in coil springs. This system is mounted on a frame and added as a single unit. Drop in units are unsupported from the bottom and do not offer the same durability.
Seat and back cushions can be constructed in a variety of ways. Industry standard in the hospitality market calls for more demanding criteria due to durability required in areas of perpetual, heavy use. Foam, padding and springs interact for a comfortable, resilient “ride.”
Density of foam refers to weight. The more foam weighs, the higher the density. Greater density yields more resilience and durability, thus higher quality. Heavier foam yields less breakdown and greater longevity.
Firmness of foam allows for different comfort levels. Indentation Load Deflection (ILD), a numerical system from 10-90, gauges the amount of pressure required to compress the foam. Lower numbers equals softer; higher numbers equals more firmness.