Air tight home with high humidity fluctuations.
Brief/thorough run down&#;total home renovation, lifted house 8&#; in the air on CMU block, slab underneath whole home, 1/2 cathedral ceiling, half 2-story, square feet total. 2-zone Bosch 18 SEER 3-ton, set to 2.5 ton, was at 3 but thought that was part of the humidity issue so we sized down to try to pull more humidity out, EV200 ERV set at 30% run time (lowest while still maintaining good air quality). Zone 3A.
Wall detail, Hardie Z10 siding, 7/16&#; Zip (taped all seams, liquid flash all field penetrations), 1/2 RMAX polyisoprene board (R-3.2) installed so seams do not line up with Zip, R-15 Rockwool, 1/2 drywall, paint.
3&#; closed-cell under house, attic and gable walls, and band board between 1st and 2nd floor.
Blew a 1.2 ACH/50 pre-drwall, touched up leaks installed drywall, had humidity issues and had blower door done again, blew a 0.9 ACH/50.
Upstairs is always higher by 5-10%. Only 1 air return in the home at top of stairs. Have not been able to get the relative humidity under 55% even with a floor dehumidifier running 16 hours a day for a week with exterior air between 70-90% humidity. Exterior humidity dropped for a while 40-55% and home stayed below 50% RH, even down to 40% during that time. Raining now and home RH is back to mid 60&#;s&#;.what is going on? Do I need to install a dehum? Going on 6 months in the home so material should not be giving off moisture anymore right?
Greatly appreciate the insight and help, used a lot of articles here to help develop my remodel and be sure that I executed an airtight home correctly and am thankful for that from everyone!
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