Does anyone have (or know anyone who has) a crawlspace that has been equipped with the 'Clean Space' encapsulation system? What are your thoughts and experiences with this approach? http://www.all-dry.com/crawl-space.php
Here's my issues: I had a new heatpump/ac system and duct work installed a little over a week ago (the indoor unit is in the 1150 ft2 crawlspace), and it is much more efficient than the old system....the supply/plenum end is sweating profusely, as well as the outside foil of the duct insulation. I can smell slight musty odor when I enter the side entrance (the dampest end of the house's crawlspace).
It's been raining a lot this past week, and the RH in the crawlspace is in the mid 90's%....even during drier weather, and using a vent fan, I've never been able to get the RH under the low 80's%. During a dry day, the vent fan would pull the RH down a few%, but if left to run past 6:00pm the RH would go back up. The house has had a poly (6mil) moisture barrier down for a long time, although it's far from being sealed....there is some exposed earth in a few places, but it's mostly covered. However, the crawlspace has ALWAYS had that dank, musty smell to it. There is no standing water that I've seen, except for now with a puddle on the poly barrier under the plenum from the colder air of the new system.
Here is what I'm trying to decide on:
1) Putting down a new 6mil barrier, and installing a Santa Fe dehumidifier. Possibly blocking off the vents to cut on humid air coming back in, although this would be far from actually sealing off the crawlspace.
2) Contracting the local Clean Space guys to encapsulate the crawlspace. The estimator said he didn't think I would even need a dehumidifier with the Clean Space system installed (they also sell their dehumidifier which is a version of the Santa Fe Advance). This option has a lot of promising claims and sounds very good to me, and the cost isn't really *that* bad if I don't have to buy a dehumidifier. It's hard to shake the old wisdom of needing to have ventilation in the crawlspace though.
Sorry so long, but it's hard to find any reviews or first-hand customer opinions online....lots of hits for the companies that install it though.