Built a couple - Techo Creta walls... Now... There is very little/barely room to use Grid (irrigation/prop. line)... so we just went about building w/out. Was back-fillin with 3/4 but NOT compacting (don't ask me why we didnt..just wasn't think + in a rush i guess) So at one point in the wall... there was a lot of dirt excavated (about 5-6 ft. behind the wall, the rest of wall maybe 1 ft.) And sure enough in the area where there was alot of extra excavation... the wall caved forward.... We had it built to out final height (about 6.0 ft) and the weight of the loose gravel was just too much. So, before it caved... we noticed it bowed forward alot... so we began to take down that section to re-compact and put grid... and when i was walking behind the wall.... it fell forward... no one was hurt... but learned an important lesson on why compaction/grid is a must. Anyways... we had the whole wall re-built in 3 hrs... end of story... Question? when using Creta... do u have to step the walls back over a certain height...??? we have a 6ft section... but it not 6 ft for too long... it gets smaller as it ascends up the drive.... maybe 6ft x 8 ft long.