frost protect well water line for structure on piers / no conditioned crawlspace?
I’m building a small conditioned structure (iecc 5b or 6b) that houses well pressure tanks & bathroom while we build our house over the next few years. I’d like to avoid pouring a foundation, and my engineer has approved a simple structure on just a handful of pre-cast “deck footings”
The only issue is the “intake” from the well – how do I (to code) get this line from frost depth (~24″; i’ll be running my well line at 4-5ft) to the heated space?
Ideally there would be a sort of “heated plenum” product, so I could avoid “skirting” and insulating the entire structure. I see https://www.pmmag.com/articles/97532-uponor-underground-pex-freeze-protection and similar – but can I run that through free-air (above grade), and do I just run that to 5ft down then add a fitting to the black poly well line? I’d be worried about getting that past inspection …
If i need to frame an enclosure, can this be done without a concrete pour? It seems mobile homes in cold climates would have to solve this – but the only method I see them using is skirting and insulating the entire structure. As detailed in another thread, the entire structure must go after we build (per input there, i’ve made some small design changes and think I can sell it for re-use , rather than scrapping it) – so any concrete, or substantial structure below it will just be thrown away, in addition to a lot more work.
GBA Detail Library
A collection of one thousand construction details organized by climate and house part