What is the method used to keep unfaced wall insulation in place?

The method of keeping unfaced wall insulation in place is friction. This technique relies on the snug fit of the insulation between the wall studs, which provides enough resistance to hold the material in position without additional fasteners. When properly installed, unfaced insulation fits tightly into the stud cavities, preventing it from sagging or shifting.

Friction is effective because it allows for ease of installation; the insulation can be easily cut to size and then simply pressed into place, which can save time and labor costs. This approach also ensures that the insulation maintains its thermal performance, as any gaps or misplacement could lead to a loss of efficiency.

Other methods, while potentially applicable in different scenarios, do not serve as the primary means for unfaced insulation. Adhesives are typically used for faced insulation or in special applications where an additional layer is necessary for securing the insulation. Staples might be used to secure insulation in certain cases, but that is more common with faced insulation; unfaced insulation relies primarily on friction due to its design. Support beams are structural components and do not relate directly to the securing of insulation.