What height of jack arch support is required over masonry openings?

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Multiple Choice

What height of jack arch support is required over masonry openings?

Explanation:
Over a masonry opening, the jack arch needs enough rise to develop true arch action and effectively transfer loads to the jambs. A rise of about two feet is a common, practical height for standard openings, providing a stable curve without overbuilding. If the arch is only one foot high, it becomes too shallow to act as a genuine arch and may carry less load and crack under stress. If it were four feet high, that would waste material, reduce headroom, and complicate construction for most typical openings. So, two feet combines sufficient arch action with practicality for standard openings.

Over a masonry opening, the jack arch needs enough rise to develop true arch action and effectively transfer loads to the jambs. A rise of about two feet is a common, practical height for standard openings, providing a stable curve without overbuilding. If the arch is only one foot high, it becomes too shallow to act as a genuine arch and may carry less load and crack under stress. If it were four feet high, that would waste material, reduce headroom, and complicate construction for most typical openings. So, two feet combines sufficient arch action with practicality for standard openings.

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