Gold Bond ® brand GridMarX Gypsum Board ® Description Horizontal Wall Application National Gypsum’s patented GridMarX installation guide marks are printed on the paper surface and come standard on all gypsum board products. These guide marks align with standard building dimensions and help to quickly identify fastener lines for studs and joist framing. Accurate cuts can be made without without having to draw lines. ® 16"o.c. 24"o.c. 32"o.c.
