By Adalheid Voigt. Midcentury. At Wednesday, January 09th 2019, 01:28:00 AM.
Now that you have considered the frame and seating support, it is time to look at what kind of filling is used for the cushions. The most common filling is high-density polyurethane. The higher the density, the firmer the cushion will be. Foam can be wrapped in softer material or cotton to make it softer. Dacron-wrapped foam is the cheapest option, but it won’t last as long.
The eight-way hand tied springs system is one of the best support systems. The craftsman connects each spring to the adjoining one with a strong twine. The twine passes front to back, side to side and then diagonally in both directions, thus tying each spring securely. Another method is sinuous spring construction. Sinuous springs are “S”-shaped and run from the front of the seat to the back. These springs are supported by additional wires that cross from side to side. This also makes for a strong seat, and it might be the preferred option in a sleeker style or smaller frame because it requires less space.
The third option is web suspension, in which bands of webbing across the seat and back. These are then attached to the frame to make a platform for the cushions. Webbing can be made of either natural or man-made fibers, and if it is used alone doesn’t make for very strong support. In better-quality sofas, it is used with a tensioner that fastens the webbing securely to the frame. The web suspension is the least preferable of the seating support options.