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Table 1. Physical and Performance Requirements for Glass Mat Gypsum Board
Property Unit Requirement
12.7-mm-thick board 15.9-mm-thick board
Flexural strength
bearing edges perpendicular to the substrate edge
N ≥ 445 ≥ 623
Flexural strength bearing edges parallel to the substrate edge N ≥ 356 ≥ 445
Humidified deflection mm ≤ 6 ≤ 3
Core, end and edge hardness N ≥ 67 ≥ 67
Nail pull resistance N ≥ 356 ≥ 400
Water resistance n/a ≤ 10 weight % after 2-h immersion ≤ 10 weight % after 2-h immersion
Thickness mm 12.7 ± 0.8 nominal thickness with local variations of ± 1.6 15.9 ± 0.8 nominal thickness with local variations of ± 1.6
Width mm up to 1 220 ± 3 up to 1 220 ± 3
Length mm 1 840 ± 6 to 3 660 ± 6 1 840 ± 6 to 3 660 ± 6
End squareness n/a Square ± 3 mm in the full width of the substrate Square ± 3 mm in the full width of the substrate
edges and ends n/a Straight and either square, bevelled, featured, tapered, or featured and tapered Straight and either square, bevelled, featured, tapered, or featured and tapered
Finish and appearance n/a Free of any cracks or imperfections that would render it unfit for its designed use Free of any cracks or imperfections that would render it unfit for its designed use