Max height of ladder jack scaffold?

• A. 16'
• B. 12'
• C. 20'
• D. 8'

Answer: (A)

The height is limited by what the ladder jack scaffold can safely support with the ladders and plank in place. The ladder jacks attach to the ladders and the plank sits on those jacks, so you’re limited to a height that the combined ladder-and-plank setup can reliably hold without tipping or slipping. With common ladder jack systems and standard construction ladders, that practical limit is about sixteen feet above ground. Going higher would push the equipment beyond its safe operating rating and increase the risk of instability, plank sagging, or ladder movement. If you need to work higher, you should switch to a scaffold system designed for greater elevations.

Eight feet is typically lower than the maximum capability of many ladder jack setups, so it isn’t the true upper limit. Twelve feet might be used in some cases, but it isn’t the standard maximum you should plan for. Twenty feet would require a different scaffold and higher-risk configurations.