Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
When the sandwich-like plies of plywood separate, it usually means that water has penetrated the material and compromised the glue.
To remedy this, force waterproof carpenter’s glue into the area between plies, and then nail the areas with galvanized common nails. Be sure the edges are properly flashed with sheet metal or caulked to prevent moisture from getting back in. And be sure the plywood has a durable finish.
For plywood that has numerous delaminations or serious damage, have the entire sheet replaced by a carpenter or handyperson.
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