What is the minimum insulation space between wythes?

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Multiple Choice

What is the minimum insulation space between wythes?

Explanation:
In a double wythe masonry wall, the space between wythes acts as a drainage and insulation cavity. It must be wide enough to accommodate the insulation material without compression and to maintain a clear path for moisture to escape through weep holes, while still allowing proper installation of ties and flashing. Four inches is the minimum commonly specified because it provides enough room for standard insulation (batts or boards) and keeps the cavity open for drainage and air movement. Smaller gaps can compress insulation and hinder drainage, while much larger gaps add unnecessary cost without essential benefit for typical construction.

In a double wythe masonry wall, the space between wythes acts as a drainage and insulation cavity. It must be wide enough to accommodate the insulation material without compression and to maintain a clear path for moisture to escape through weep holes, while still allowing proper installation of ties and flashing. Four inches is the minimum commonly specified because it provides enough room for standard insulation (batts or boards) and keeps the cavity open for drainage and air movement. Smaller gaps can compress insulation and hinder drainage, while much larger gaps add unnecessary cost without essential benefit for typical construction.

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