How much through-wall flashing needed with full-thickness masonry?
I am about to clad my structure in full-thickness limestone veneer, and I’m getting conflicting advice about what constitutes proper through-wall flashing. Would appreciate feedback from anyone with experience in the matter.
From outside to in, my wall system is 3″-5″ thick limestone, 1″+ air gap, HomeSlicker with Typar (a drainage mat/WRB), then a liquid applied weather resistive barrier on OSB sheathing. Using Textroflash for the through-wall flashing at the base of the walls and tops of windows. It’s a self-adhesive 40-mil composite membrane.
Anyway, the masonry supplier who sold me the TextroFlash says it serves perfectly fine as a durable through-wall flashing. It comes with instructions, though, that say a stainless-steel drip edge flashing must ALSO be used underneath the TextroFlash. Supplier scoffs, says that is pointless overkill to double up the flashing.
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