Assuming a nail angle of 45 degrees, this is the formula for figuring the lenght of the long side of a triangle (hypotenuse).
C=sqrt(A^2+B^2)
Where A = depth of material
B= horizontal distance of nail at 45 degres
C= length of nail
A: Depth of material: 1/2 + 3/8 + 1/2 = 1.375
(note you nail through the tounge, so only 1/2 for floor).
B: Horizontal distance of nail at 45 degreees = 1.375
C = 1.94: The nail should be 2 inches to penetrate all layers. A 2-1/2 inch nail would emerge too far from the bottom of the subfloor. |
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