Slate Size per Square Table

SLATE EXPOSURES AND HEADLAPS Table

When Using 3” and 4” Headlaps (Showing Number of Slates per Square).

Georgetown Standard is 16X10 with a 3” Headlap.

Slate Size (in.)   Exposure (3” H.L.)     Slates/Square         Exp. (4” Headlap)            Slates/Square

6×10                            3 1/2”              686                              3”                                800
7×10                            3 1/2”              588                              3”                                686
8×10                            3 1/2”              514                              3”                                600
6×12                            4 1/2”              533                              4”                                600
7×12                            4 1/2”              457                              4”                                515
8×12                            4 1/2”              400                              4”                                450
9×12                            4 1/2”              355                              4”                                400
10×12                          4 1/2”              320                              4”                                360
7×14                            5 1/2”              374                              5”                                412
8×14                            5 1/2”              327                              5”                                360
9×14                            5 1/2”              290                              5”                                320
10×14                          5 1/2”              261                              5”                                288
12×14                          5 1/2”              218                              5”                                240
8×16                            6 1/2”              277                              6”                                300
9×16                            6 1/2”              246                              6”                                256
10×16                           6 1/2”             222                                6”                                230
12×16                          6 1/2”              185                              6”                                192
9×18                            7 1/2”              213                              7”                                221
10×18                          7 1/2”              192                              7”                                199
11×18                          7 1/2”              175                              7”                                187
12×18                          7 1/2”              160                              7”                                171
10×20                          8 1/2”              170                              8”                                180
11×20                          8 1/2”              154                              8”                                164
12×20                          8 1/2”              141                              8”                                150
14×20                          8 1/2”              121                              8”                                129
11×22                          9 1/2”              138                              9”                                146
12×22                          9 1/2”              126                              9”                                134
14×22                          9 1/2”              109                              9”                                115
12×24                          10 1/2”            114                              10”                              120
14×24                          10 1/2”            98                                10”                              103