Shimpaks are typically available in which sizes?

• A. 4x6
• B. 4x4
• C. Both 4x6 and 4x4
• D. None of the above

Answer: (C)

Shimpaks are standardized spacer blocks used in tilt-up construction to set and hold tolerances around openings, embeds, and formwork during concrete placement. The sizes are chosen to match common opening and joint dimensions, so manufacturers stock more than one option. Both 4x6 and 4x4 are commonly available because they cover a range of gap needs and allow you to select the right amount of packing for different details. This is why the best choice is that they’re typically available in both sizes.