Pier and beam foundation in Climate zone 5
I'm planning to build an efficient house in southern Ontario, and am looking at different foundation options. Any feedback would be greatly appreciated.
Here is one approach I'm considering: pier and beam, with deep open web floor trusses resting on the beams. The underside of the trusses would be sheathed in plywood. My preferred insulation, at this point, is dense packed cellulose insulation. I would use floor trusses at least 18" deep. Airsealing would be a high priority.
A crucial detail to making this design work is freeze protection for the water supply line and drain pipe (plumbing is bunched together on the first floor). How have others handled this?
My thinking is to build a (very well) insulated box that would extend from the underside of the house to below the frost line (yes, like an insulated, unvented crawlspace), backed up with heat tape on the water supply line.
Posted Jun 19, 2014 12:32 PM ET
Edited Jun 19, 2014 6:42 PM ET
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