Basement options: SIP panels – concrete walls – or abandon for slab on grade?
My wife and I are planning to build a SIP house near Whitehorse, Yukon (zone 7, 60degN lat.) this summer. I can provide more details if anyone is interested but the advice I am seeking now are opinions on my foundation options:
1) SIP panel basement foundation (quoted at ~$14000): 24’x40’x8’ tall, 8.25” thick, R33, pressure treated 1/2” ply on outside, untreated 7/16” OSB inside, pressure treated internal studs (to be placed on a concrete footing); this will take around 1 day to assemble.
2) concrete basement 24’x40’x8’ tall: for the concrete only (no forms/insulation/labour/etc.) for an 8’ tall concrete wall comes out to around $5500 (not including concrete footing); ICFs are an option too.
3) slab on grade, make the house bigger to accommodate a mechanical room, not sure on the cost of this, but a 4” concrete pad ~24×40 is around $2200 for concrete only; seems like this might be a challenge to build myself since I have no experience with these.
Here are some considerations:
– the foundation will be backfilled within 1’ of grade.
– it is very difficult to find any contractors, businessses are working flat out during the spring/summer, so I am planning to hire some skilled labourers and complete all of the work myself. Also, I am doing all of the design/procurement/budgeting/decisions making/etc. myself (the SIP provider supplies engineered stamped drawings for permitting).
– the house will be on water deliveries and the 8’ basement will allow us to have 3×1000 gallon water storage tanks, along with work space, storage space and mechanical room.
– it was -40 degrees and colder multiple days this winter, Whitehorse is the driest city in Canada with around 10” of rain per year.
Which would you choose?
Any advice/guidance is appreciated.
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