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My garage is attached to the house. The wall that is common with the house is finished with drywall. Can I put plywood over the drywall?

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I think I am accurate in saying this.... As long as you keep the drywall layer at the house/garage, and do not damage it in any way (screws ok) you will not compromise the fire rating of the original sheetrock. The drywall at that wall is a requirement for fire safety, it is typically a thicker, 5/8", and fiberglass reinforced to withstand a potential fire in the garage for a time before it spreads to the house.

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