DensGlass sheathing and rainscreen materials
Other than not holding siding fasteners, what are the downsides of using Densglass instead of plywood sheathing? A (modest) price difference? Is taped Densglass less of an air barrier than taped plywood?
I’m replacing an unsheathed stucco wall and will probably use plywood sheathing (I want no OSB in my house), but I’m curious about Densglass because I’d like to minimize the use of organic materials that can absorb lots of water or rot. I know densglass means that fasteners for the rainscreen material and sheathing need to be in the studs, which increases hassle and maybe labor costs, but I’m wondering if that’s the only downside.
My wall would be (inside to outside) drywall, 2×4 framing with bays filled with Rockwool (sound is an issue and I’m trying to minimize wood/cellulose), sheathing (plywood, or maybe Densglass Gold), a highly permeable non-perforated WRB, possibly rigid insulation (1.25″ roxul?) , but probably not unless the inspector requires it because the Northern California climate is mild, a rainscreen material like House Slicker or DC14 drainage mat), felt-backed metal lath, 3-coat stucco, and paint.
Do you think DensGlass would be a poor substitute for plywood in that application? Also, what do you think of the DC 14? It has low permeability and the channels seem to be intended to create an air gap on either side of the material. I’m not sure if that’s brilliant or scary.
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