Insulating crawspace with high water table
this question is for remodel of 1960’s single story house in the Bay Area.
The house is build with crawlspace which has very high water table.
It currently has sump pit and a pump and during the rainy season got basically water running to the sump pit.
Planning a full house remodel to build near passive house. I am planning to put a french trench outside of the house but still I think that there will be some moisture in the crawlspace. There is no option for slab or any other changes like this. During the remodel I will make the walls R29 and conditioned attic with R60. There will be only some electrical and plumbing in the crawlspace – no mechanical.
What do you think is my best course for the crawlspace?
Insulate only the bottom of the sub-floor? Basically similar to external wall – air seal, put some moisture barrier and 5 inches of rockwool between the joists. Insulate the joists as well somehow?
any other ideas?
would rat slab be a good idea?
Thanks in advance,
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