How to Guide

GridMarX spaced
4" apart
Studs spaced
16" o.c.
Represents a
pipe or wiring
GridMarX
®
To help simplify drywall installation, National
Gypsum’s PURPLE drywall products come standard
with our unique GridMarX guide marks printed
right on the paper surface. These marks align with
standard building dimensions and help you quickly
identify fastener lines for studs and make accurate
cuts without having to draw any lines.
When applying the board horizontally, GridMarX
serve as a reference mark to help identify the
location of framing members behind the drywall.
For example, if the framing member is located
2" to the right of the GridMarX reference mark
at the top edge of the board, it will be located
2" to the right down the face of the board.
Drywall Installation
Handling and Storage
Store flat and off the floor. Keep dry prior to installation.
Estimating Materials
Quickly determine how much PURPLE drywall will be needed to complete your
project. Be sure to allow 10% to 15% overage for cutting and piecing.
Sq. Ft. of Drywall Size
Wall/Ceiling 4' x 8' 4' x 12' # of Nails # of Screws
100 4 3 168 90
200 7 5 294 150
300 10 7 420 240
400 13 9 546 300
500 16 11 672 390
600 19 13 798 456
700 22 15 924 528
800 25 17 1050 600
900 29 19 1218 696
1000 32 21 1344 768
Cutting Drywall
Cut drywall to fit short walls,
doorways and openings
for electrical outlets, etc.
Measure carefully and mark
with a pencil.
n
Using a straightedge and
utility knife, score the drywall
on the face paper side
along the pencil line(s).
n
Snap board along the score
over the edge of a solid
support. (A quick action
produces the best results.)
n
Using utility knife, cut
through back paper.
n
Smooth the rough edges
with a rasp.
More installation instructions – see next page.