Since roofing underlayment is a code requirement i would check with my local code enforcement official to make sure that the official agrees before deciding whether it makes sense to skip the underlayment.
Zip roof sheathing vs plywood.
For pricing and availability.
Huber manufactures the premium osb products such as advantech sheathing which many builders prefer over plywood due in part to quality problems they were seeing in plywood.
Zip system sheathing was introduced by huber engineered woods in 2008 and it has been widely adopted in many parts of the us.
How does this product compare to using plywood and a housewrap such as tyvek.
Installation manual zip system sheathing wall and roof zip system sheathing and tape fact sheet integrated sheathing or housewrap white paper zip system brand brochure house of brands brochure view all.
Zip system roof assembly combines our revolutionary integrated sheathing and flashing tape or liquid flashing to provide a sealed roof for protection against moisture intrusion during construction or if high winds strip the roof covering away.
If you do add new plywood sheathing you could just tape the joints and it will act as your air barrier.
Zip system zip 1 2 cat ps2 10 tongue and groove utility osb application as 4 x 8.
Zip system 5 8 cat ps2 10 osb sheathing application as 4 x 8.
Osb is okay but plywood handles moisture a bit better.
Sheathing panels are butted and taped creating a reverse lap the sheathing boards are butted together with a 1 8 inch gap between panels.
Just over a year ago huber the maker of advantech sheathing.
A strong resilient roof is a home s first line of defense when the roof deck is exposed to weather.
They are installed the same as typical osb or plywood sheathing to create a weather proof and draft free barrier.
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This joint is then covered with the seam tape.
It is not recommended for use as a durable sheet panel product.
The zip system product is about the same thickness as plywood and when subjected to a buildup of moisture can deteriorate at a much quicker rate than plywood.