Best backsplash backer? Are Hardie / alkali tape / thinset airtight?
One GBA-type question… if I use Hardie and finish th seams w/alkali tape + thinset, will that be airtight? I can’t find anything about the airtightness of those materials.
And one general building question… I’d rather use drywall, for practical/silicosis/timing purposes — and because I know how to air-seal it perfectly with gaskets/sealant. If I do that, should I just install drywall and an appropriate primer on the wall, then mortar? Anyone know a good primer for this? Thanks!
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