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A wall is a usually solid structure that defines and sometimes protects an area. Most commonly, a wall separates space in buildings into rooms, or protects or delineates a space in the open air. There are three principal types of structural walls: building walls, exterior boundary walls, and retaining walls.

Building walls have two main purposes: to support roofs and ceilings, and to divide space, providing security against intrusion and weather. Such walls most often have three or more separate components. In today's construction, a building wall will usually have the structural elements (such as 2×4 studs in a house wall), insulation, and finish elements, or surface (such as drywall or panelling). In addition, the wall may house various types of electrical wiring or plumbing. Electrical outlets are usually mounted in walls. Building walls frequently become works of art, such as when murals are painted on them.

On a ship, the walls separating compartments are termed 'Bulkheads', whilst the thinner walls separating cabins are termed 'Partitions'.

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The Journal of Light Construction

Backfill: Still Grinding After 200 Years (JLC August 2008)
Still grinding after 200 years.
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Working the high-rise niche
21st-Century Greek Revival (JLC August 2008)
Use PVC trim to create a durable version of this classic cornice.
Adding Under (Continued) (JLC August 2008)
Further details on how Danny Feig-Sandoval and his crew transformed a dirt crawlspace into new living space without disturbing the home's brick foundation.
JLC Extra Q&A: Compressing Fiberglass Batts (JLC August 2008)
Q: I've heard that if you use 5 1/2-inch-thick fiberglass batts in a 2x4 wall, the insulation will have a higher R-value than standard 3 1/2-inch batts provide. But some people say that compressing fiberglass batts lowers the R-value. What's the story?
Simple Sill Pans (Continued) (JLC August 2008)
Bill Robinson demonstrates how to fabricate a vinyl sill pan in this video supplement to his August article, "Simple Sill Pans."

 
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