or are the 2x4's sitting on top of each other on the 4" side and strapped together simulating a 4x4 post? Like this
===== sub floor
[___] first 2x4" with 4" side to floor
[___] second 2x4" with 4" side to above 2x4"
...........open crawl space below.
Also a little education, you mentioned before that when you measured between the joists the "space" was 22 inches. the measurement is "on center" that is needed. you can achieve this from measuring from the left edge (crawlspace floor side) of one joist to the left edge of the adjacent for the OC (on center) spacing, or
from the center point of the "thickness" of the joist to that same center point of its adjacent (next over) joist. That gives you the OC spacing. Another way is to measure the "space between" the joists plus add the measurement of the "thickness" of the joist, that is to say the edge that is opposite the edge that TOUCHES your sub-floor.
Then do me a favor, and tell me the measurement from the "ceiling of the crawl space" or the point where the joist top touches the subfloor down towards the floor of the crawlspace where the joist ends (height of the joist NOT the distance to the crawlspace floor) does this make sense? think of the "side" of the joist as a wall I need to know its "height" is it 4" (3-1/2) or is it 8" (7-1/2") "high"? total with this v-strap system that "marries" the 2 each 2x4"s together. because I'm still somewhat confused as to what you were describing earlier.
Moderated by Handyman 
