Installing stone veneer - weather barrier necessary?

I'm installing a stone veneer on top of a brick/cinderblock chimney with

2x4" studs and 7/16" OSB on top of that. The website for the company says to use 15 lb asphalt-sturated rag felt or ASTM226 over the OSB. This is for an inside fireplace. Is the weatherbarrier really necessary? I couldn't find a distinction about whether they were referring to an indoor/outdoor installation.

TIA

Matt

Reply to
Matt Williamson
Loading thread data ...

HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.