Quote:
Originally Posted by I-Hate-Hulse
Unfortunately, I forgot to mention that the dividing wall is not mudded or taped, just boarded, so there are open seams between the sheets. I assume that isn't going to be enough. Between taping these or tearing it out I think I'd rather do the latter.
Is Roxul/rockwool code for a dividing firewall? The batt material there appears to be while John Mansville fiberglass. House is about 9 years old.
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Mineral fiber batts are
most often used in these applications, but fiberglass is also acceptable under the code provisions.
Taping
is required for all fire rated demising walls...methinks that this must have "snuck" through the inspection process at some point in time.
Tearing off and replacing the board (in this case) would be a needless expense.
The coatings system (as I described above) will deliver a "perm" rating in the ballpark of 1.0>1.8, more than suitable for the situation, as the wall construction will dramatically mitigate the temperature differential between the two sides; moreso yet if your intent is to only keep your side a few degrees above freezing during the heating season.
Tape the wall (or
get it taped, if you're hiring a Drywall contractor for that aspect of your finishing process), paint as described above, and buy beer with the $ you saved.
If you "tear off", you will have to replace the board with "Type X"...and it's a whole lot more a sheet (almost double the price) as is 1/2" standard.
Also...if the paper on the wallboard has been sitting exposed for 9 years then yes, prime it with alkyd (enamel) undercoater. You can finish with S/G Acrylic right over top of the oil primer with no worries.