PLYWOOD / OSB ROOF SHEATHING:

OSB PLYWOOD SHEATHING ROOF SHEATHING:
Sheathing is the material fastened to rafters to support the actual roofing material. 4 x 8 foot sheets of plywood are used under almost all roofing materials in new construction except wood shingles, which is usually sheathed  under with 1 x 6 inch boards laid perpendicular to the rafters and spaced a few inches apart. Both plywood and oriented strand board (OSB) are extremely strong and rigid when installed properly and are both common framing methods. sagging excessively. 1" x 6" T&G stock may be used in roof sheathing where the framing has rafters spaced 16 to 24 inches apart. Often this type sheathing is used only at the eaves where it is visible. The tongue and groove configuration is instrumental in helping the sheathing maintain rigidity, in that, the "tongue" (which runs the full length of the board) of one board is inserted into the groove of adjoining boards which runs their full lengths. 

The above information was provided by TWI Systems Copyright 1995-2005 1-800-553-5660

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This file was last updated on Saturday, 13-Sep-2008 00:06:59 EDT * Copyright © 2008 All rights reserved by: Accurate Inspections, Inc. A New Jersey home inspection firm providing New Jersey Certified Home Inspections in NJ, by New Jersey Licensed home inspectors. Inspector of record Michael Del Greco, New Jersey home inspectors License GI 0121.
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OSB PLYWOOD SHEATHING ROOF SHEATHING