The Difference Between OSB and 1/2" Plywood
OSB Sheathing is an inexpensive material commonly used with many roofing contractors. The difference between OSB and Plywood is in its durability. Both products degrade when wet, but not equally. Experiment: If you half-bury a piece of exterior rated plywood in the ground for six months, it will come out looking ragged. The same treatment to exterior rated OSB will likely to have dissolved. The sharpest difference comes from the more realistic test of moisture damage while the material is under stress or load, just as a piece of sheathing would be. In tension, dampened plywood will retain some strength, while OSB becomes wet glue.
OSB sheathing is used as a standard by more than 90% of roofers. OSB problems occur because it SWELLS and WEAKENS when it gets wet from poor ventilation or leaks. If shingle nailing pulls out, chunks of OSB tear out. Most roofers will charge a cost to upgrade if you make them switch to plywood.
Integrity Home Pros Standards
Integrity Home Pros believes using 1/2" plywood for re-roof sheathing is stronger and more durable than OSB boards due to the manufacturing and laminating processes.
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