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By N2H

Thick Wall

Cracks propagate along wall face

d

38-44 mm

1 1/2″-1 3/4″

L

30-60 cm

1′-2′

When perpendicular cracks to wall face are necessary:

Add a reliever hole. Spacing may be 10 cm (4″) through 20 cm (8″).

Drill larger d of holes