Replies

1. 
   Steve Knapp CZ 3A Georgia|Feb 28, 2021 11:11am|#1

   Bill,

   This article suggests probably yes if done correctly.//m.etiketa4.com/article/airtight-wall-and-roof-sheathing

2. Expert Member
   Malcolm Taylor|Feb 28, 2021 11:43am|#2

   Bill,

   Yes, although using the sheathing as an air-barrier is typically easier on walls than roofs.

   On walls you just need to pay attention to the intersections of the walls and other assemblies (foundations, ceilings, openings, etc.).

   With roofs it's bit more complicated, and depends on how the roofs are constructed. Most roofs are vented, so air is intentionally introduced below the sheathing. And some unvented roofs can require some way of stopping air from reaching the sheathing to prevent condensation. Roofs usually rely on an interior air-barrier instead.