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Question #17
What is the proper spacing for U-Boats? This is asked very often. U-Boat spacing is as follows: Joist Spacing = 24'' o.c.* = U-Boat spacing 16'' o.c. along the joist minimum and not to exceed 24'' o.c. Joist Spacing = between 12''-16'' o.c. = U-Boat spacing 16'' o.c. along the joist minimum and not to exceed 32'' o.c. Most (>99%) of applications will work fine with 16'' o.c. spacing of U-Boats along the joist. Spacing further apart will improve low frequency isolation below 40 Hz. However, spacing should never exceed 32'' o.c. *o.c. stands for ''on center'' and represents measuring spacing from center-to-center of, say, joists or studs (or U-Boats). This is to prevent confusion caused by sometimes erroneously measuring from edge to edge.
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