So, they will need to remove insulation to access all joists/floor boards.We agreed Dehumidifier to be installed to prevent the issue from reoccurring.I already have vapor barrier installed.Crawl Space Ninja stated that the fiberglass blanket insulation between the joists in my crawlspace can remain removed post remediation.

Remediation methods can vary greatly depending on the type of and extent of contamination, ranging from soil excavation to more complicated soil vapor extraction systems.

If your construction costs are wrong, you're in trouble....Attach a price to each of the following:General ConditionsSite PrepGrading/ExcavationConcrete/FoundationFramingElectricalPlumbingHVACWindows and DoorsWrap/Vapor Barrier/WaterproofingInsulation/FenestrationRoofingSidingDrywallCabinetsCountertopsTile/Stone/MasonryFlooringPaint/StainFinish/Trim CarpentryRailingsGlass/MirrorsOther

But we taped vapor barriers that were called out on home inspections  we took up the cellulose debris ( wood pieces )  my finish carpenter was there I had him come over and adjust a door that was catching.. ( client gave me the key to his house while he went Kayaking on the Oregon coast). 

A friend suggested the use of a vaporizer could be the culprit (one of their children is asthmatic) and a windows company who went to inspect it said they had covered the weep holes, which would definitely cause mold.

Also, the erection of CLT buildings should be done by specialized contractors who have experience with the product.Another area that is seeing new technology applied is in the waterproofing / vapor control products.

You'll also have to seal the existing concrete with some sort of vapor barrier.Easier to just go the concrete route.... 

You will probably be required to tear the entire floor out and out in a vapor seal.  

The situation resolved itself because they decided to move out, and as a precaution I took up the new flooring, installed a vapor barrier, and installed new flooring on top (painful since I had installed it all a year before, but in the end it really just came out to a few months profit).

Once inside the walls it can simply sheet down the voids on the backside vapor barrier.