drainage

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you definately need to have drain tile behind the wall. and a big note for the installer is that the 3/4" crushed rock that goes behind the wall goes all the way to the top to ensure full drainage and no fear of saturated or frozen ground pushing the wall out.

by the way bad link to your product..

allan block large size is good for these projects.
http://www.allanblock.com/

railed is fastened to the block cap ,by drilling and using concrete screws.