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6in Box Void Form, 48 x 12 x 6in
The 6in box void form creates the specified temporary forming space beneath concrete beams or slabs in an engineered expansive-soil design. It supports fresh concrete during the required construction stage, then loses supporting strength as its fiberboard absorbs moisture.
Dimensions and Material
Length: 48in. Width: 12in. Depth: 6in. Construction: wax-coated, laminated corrugated fiberboard. Package: one form per carton.
Sacrificial Forming Function
The self-locking form has closed ends and assembles without staples, tape or banding. Listed vertical strength is 1,200 lb/ft²; project loads, timing and environmental conditions still require engineering review.
This is a paper-based sacrificial form, not closed-cell foam or permanent load-bearing support. Keep forms protected from premature moisture exposure and follow the approved construction and storage requirements. A 6in depth should be selected because the design specifies it, not as a universal allowance for soil movement.
If your drawings specify a shallower void, compare the 4in box void form.
