Hello-
We have a sono tube pier addition in Zone 5 (Toronto Canada)

Room is about 20 by 8 and includes  6 10 inch diamater concrete posts 4 feet deep (the engineer approved this foundation for our medium dense sand soil and frost line).

The soil has been topped with 3 inches of gravel and the gravel  been sprayed with about 4 inches of closed cell foam and the foam runs up to the rim and is also between the studs of the knee walls. The idea is that this is a conditioned “crawlspace” all above grade.  The exterior walls are Maibec siding, house wrap, then plywood.

It appears to not have any air leaks below the floor.

Plan is to have vents to the living area (with a fan to assist in winter) in order to condition the space. (We fireproofed and primed the spf).

We have just realized that actual concrete piers were not spray foamed at all so we are concerned that will allow vapor in from that concrete and / or cause condensation due to the  concrete posts being cold in winter (and perhaps even in the summer).

Do you think we need to get the foam guys back in to spray the concrete posts?

Thanks for your help!

SM