Matt Risinger deems the only two viable sheathing choices to be OSB and plywood. But what do you need to keep in mind when deciding which is right for your particular project? The most vulnerable part of the house is where the sheathing goes. Commonly pressure sheeted plywood is used first at the base and then OSB is on top. It's important to do this properly to avoid water damage and exposed plywood. Remember to use a primer on the plywood and OSB for proper sealing too, as it could save you some trouble down the road. Two important factors to considerVapor Permeance When it comes to stopping the vapor drive at the Weather Resistive Barrier, OSB tends to do a better job than plywood due to the amount of glue used to make OSB. Drying ability While OSB works very well as a sheathing, it needs to be 100% protected from moisture. Once it gets wet and is unable to dry due to reduced air flow, it's difficult to get it dry and stay structurally sound because mold prefers the most broken down form of cellulose it can find.Regardless if you choose OSB or plywood, Risinger advises you obtain the utmost precision in your weatherization techniques. Tune into the video to learn more.