mystery markings on free HF tape measure

[LCHIEN]

Got a free HF tape measure 25 ft x 1" the other day.

Just looking at it, there's some small diamond markings toward the edge. Locations:
19-7/32 inches
38-13/32
57-19/32
76-25/32
96
115-7/32
etc.

what is 1/5th of 8 feet? (besides 1.6 feet, or 19-13/64th?
Can't find it in Google. its not metric obviously because its evenly divisible into 8 feet. Something to do with plywood, sheetrock or wall board (which is 4 ft and 8 ft. dimensioned)?
Not stud locations (16 inches)?

Not a bad tape measure, BTW. Esp. for the price.

[newbie2wood]

http://wiki.answers.com/Q/What_are_t...a_tape_measure

[durango dude]

(from Stanley tool knowledge base)

The black diamond marks every 19.2" on our tape rule blades are for spacing Engineered Lumber joists and studs. Several wood product manufacturers offer Engineered Lumber as a substitute for conventional lumber. Span tables for these lumber products provide ratings for spacing of 12in., 16in., 19-3/16in., and 24in. If you multiply these dimensions by 8, 6, 5 and 4, respectively, you'll notice that you come up with 96in., the length of the panels that will be used for sub-flooring or sheathing. Engineered Lumber is usually specified by the architects and engineers who draw the plans. They take advantage of its strength by using fewer joists or studs where codes allow.

[LCHIEN]

thanks Newbie and Durango ! Was not familiar with that dimensioning. More familiar with the 16" stud spacing you sometimes see on tape measures. I was at least right about having something to do with 4'x8' sheet material.

ALso I learned something about searching. I thought I was pretty good at searching but clearly, if i had searched for black diamond and tape measure and maybe 19.2 inches i would have found it. I was searching for "fifth of 96 inches" and "19-13/32" which were not interpreted too well.