Semi cross posted to alt.home.repair.
Still digging out my crawlspace. Working on it for the second year. Digging it all to 42" depth which allows me to crawl in and out on two feet with bent legs. This allows me to replace all the crappy supports, fix the plumbing, waterproof and insulate. I have to finish soon because I'm getting too old and sore to do another season of digging. I sit on a little stool, shovel dirt into 25 quart plastic bins, after 8 bins are full I place them on a conveyor and let them roll outdoors where I dump them. After a big pile I pick the dirt up with my Kubota tractor bucket and add it to my large dirt pile. Repeat, repeat ......
Anyway, attached is a picture of a typical footing under my house. CMUs are used (mis-used) throughout. Obviously they have failed and account for my uneven floor. You can simply look up at my ridgeline (roof) and tell that there are foundation issues.
I've (registered Civil Engineer) designed a lot of retaining walls and load bearing walls using CMUs (Concrete Masonry Units). I hate how they are totally abused and misused.
The following picture is a typical support under my house. 1950s construction. This crap is throughout the house. BTW, the previous owner, responsible for all of this, was successful in the lumber business. You would think that for JUST ONE support under the house he could have come up with the money for either a 4"x4" timber post or maybe a 6"x6". Heck, he only would have needed an 8 or 10 inch length!!
This kind of crap is throughout this part (north) of Oregon. Most of these places were improved without the benefit of permits or good advice. My neighbors are stunned that I actually fill my concrete blocks with concrete. Using rebar blows their minds.
I cringe when I see this. I cringe when I see somebody working under a car supported by CMUs.
The only allowed use for loose CMUs should be low (2 rows maximum) bookshelves in college dorms.
Sorry about the rant. BTW, I've already removed and replaced about 11 occurrences of the above.
Ivan Vegvary