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yes because we know ocean pines is known for their beautiful engineering....from their 9.5" LP pressure to their horrible sewage pump stations.

The crawlspace has the screen doors on it. Fairly well covered, the open vents and screened hatches were the prime offenders. Leaking duct work, inadequate ventilation in attic, bathroom vents in attic over sized equipment, already recommended 1-2 ducted Sante Fe's in crawl after sealing duct work and crawl space and getting leakage tested. But they put the brakes on till the pro's from Dover came in. Has two sump pumps.
Still haven't seen the engineer's load calc but he made recommendations on equipment and modifications while saying he hadn't done the load calc(??) yet.
New Unico system was an abortion, installer was back to try and fix that with the Rep in tow. But I don't think that will be right, (R-4 in attic, system sweats like hell).
I pulled out from doing the work, too many hands in the pudding. They come back at me for this I wouldn't be happy.

It sounds like he wants to create positive pressure and thoroughly dry out the crawlspace. I bet that the positive pressure from the supply vents is intended to diminish humid air infiltration. Assuming the crawlspace is well sealed, the vents most likely won't deliver enough air to fully condition it, hence the R8.

I would install a central dehumidifier also, but probably the engineer thinks that the crawlspace is the most important problem right now. If it becomes dry enough, it may help the rest of the structure dry a bit too. I can see where he's going with that -- protect the integrity of the structure first. With already 2 Santa Fe Advance in the crawlspace, a central dehu would be for IAQ.

Stamas, if you tighten up that home that has had a previous mold issue with out considering extra dehumidification, your issues will be ten fold down the road. The engineer has added something extra to his coffee.

Should have mentioned house is in a high humidity coastal area, on the water. Older home, not the best construction wise. Already suffering dearly from high humidity.

id bet dehumidifier will not be needed after crawl is sealed up

Don't see why?

Auditor wants the crawlspace gutted, mold remediation done, new 16 mil vapor barrier, foam walls, close/seal vents and 2 Sante Fe Advanced put in. And add 3 supply vents from duct system dumping in the same area.
Engineer wants this and R-8 added to duct work after the place is conditioned? But does not see any need for central dehumidifier. He believes the A/C will take care of it, (house to have major sealing work done).