Concrete masonry units (CMU) have long been considered the ideal backup material for brick facing; however, because of increasing installation costs, CMU backup systems have given way to metal stud backup systems. Brick veneer with metal stud backup walls, because they are a very cost effective and versatile wall assembly, are very commonly seen in today’s commercial buildings. The original exterior metal stud wall systems of the 1970’s were simple. They consisted of metal studs at 16 or 24 inches on center, with fiberglass batt insulation having an integral vapor barrier placed in between. Gypsum board sheathing was placed on each side, and 15 pound felt paper was installed over the exterior sheathing. This system eventually would fail and allow air and moisture to enter the building, degrading the insulation and thus the R-Value of the wall, not to mention causing other significant problems.
09 20 00 Plaster and Gypsum Board
In addition to detailed information about the various types of plaster and gypsum products (and product systems) available, this topic includes information on assemblies, support, framing, and suspension methods.
Planning and Best Practices
The light gauge metal stud framing phase of a project significantly impacts several other trades. It is no secret that good planning and practices will achieve higher production rates and a level of quality that meets the project's specifications. Planning and layout should be the responsibility of the project foreman; however, everyone should be involved with preparing the work flow. While actual layout is underway, other production items should also be thought through.
Finding a big hole in your drywall isn’t much fun, but fixing it isn’t a big problem. Whether you have a hole to fix or you are just prepping to paint, a few supplies and tools are all you need for the job. Join the At Home channel’s host, Jeff Wilson, for a demonstration of how to repair a variety of different size holes and divots in drywall.
Metal furring refers to a non-structural metal attachment that is used to hold a finish material. In metal-framed construction, the furring pieces are long, light gauge materials of various shapes. Builders commonly use metal furring as a method of supporting one layer of material over another, or holding insulation or other construction items between materials. They also use it in order to meet fire codes or provide sound barriers.
Plaster assemblies include traditional three coat systems over wood, metal, or rock lath, as well as more recent plaster systems such as veneer plasters.
Plaster in a traditional three coat system is unmatched in its strength and durability. This system is also fire resistive and can reduce sound transmission. Plaster must be applied in such a way that it adheres to the support surface; the support surface, in turn, must be strong enough to carry the weight of the plaster. In the past, applying a plaster coating over a stone or masonry wall seemed to satisfy the strength and texture requirements. However, when framed construction became popular, interior walls lacked both. To solve this problem, thin strips of wood called lath were applied perpendicular to the framing. This solution both strengthened the wall and created a uniform surface to which the plaster could adhere.
Non-structural metal framing, or light gauge metal framing, has become one of the best options for supporting plaster walls. Typically, light gauge metal framing is considered to range from 25 ga. to 18 ga. Non-structural metal studs can be produced from 1 5/8” to 14” widths to meet a great many framing requirements.