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Plywood under granite tiles

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Anonymous

17y ago
Updated: 8/16/2019

The floor joist must be sound and you must have at least 1 1/4 inches of plywood. Top layer MUST be extior grade (CDX grade for example). This is the minimum.

Would much rather see 1/2 inch durarock or hardi-backer over 3/4 inch plywood.

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Wiki User

17y ago

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