They fit the most common applications without having to be cut. Eight foot is the standard size for height in most rooms in residential and business buildings in the US. Not having to cut them at the job site saves a lot of time! basically to accomodate 2- 4 foot pcs of wallboard plus 1/2 to 3/4 ceiling drywall or standard 8 foot paneling. 12 foot ceilings are also common in upgrade or older homes The goal is to make installation of 4'x8' drywall panels easier. A typical wall includes studs (92-5/8" if pre-cut), a sill plate (1-1/2" thick) and a double top plate (3" thick). Total framing height = 97-1/8" (8'-1 1/8"). The ceiling drywall gets installed first and is normally 1/2" thick, or 5/8" where fire-rating is required. That leaves 8'-0 1/2" or 8'-0 5/8" of wall height to install the drywall panels without cutting or leaving oversized gaps.
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92 5/8"
The studs should be 16" apart.If you're estimating the lumber, figure 1 stud per linear foot of wall.You'll need the extra's for corners and headers and plates.
8 spaces, 9 studs.
Studs are normally on 16 inch centerlines, so, with 16 feet being 192 inches, you would need 12 plus 1 (for the starting stud) plus 2 (for the top and bottom plates) per wall. That is 15 studs per wall. Multiply that by 4 and you get 60 studs for the room. This doing not count framing for doors and windows, nor does it count studs for the floor and ceiling. If you get 16 foot studs, you can use 8 for the caps, leaving you needing 52 studs that are 8 foot long, so you would need 26 16 foot studs to make the 52 8 foot studs. The total required studs, then, is 34 16 foot studs.
14 studs