Drywall with seams that aren't taped.

[Joel Florek]

I am reaching out to see if anyone knows anything about the type of drywall that is designed to be hung vertically from floor to ceiling, glued to the studs, and has no nails except the bottom(under trim, and top)hidden behind crown molding. In the corners they tack some small 1/4x 1" boards to clean off

I purchased an 8 unit property consisting of 4 duplexes. There is some interesting construction techniques that I haven't seen too often. One being the walls which have drywall described above. The edges have a smooth quarter inch rounding which the sheets butt together. After painting, it looks just great. Lots of labor saved on the installation but I have yet to find info on the internet regarding the technique or product. 

I am hoping someone else knows more about this and specific type of drywall that is used. It doesnt have the indent that normal sheets of drywall has on the long edge.