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Old 07-20-2009, 07:13 AM   #1
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retaining wall trench/backfill/drainage questions


hi all.

i have my bank cut away and my trench dug.

50' long, 30" wide, 8" deep. the height of the wall will be roughly 30"-36" at it's highest point, and about 15-20" at the lowest.

my question is: i had a reputable mason tell me that all i needed was:

8" trench with 4" of crushed stone
landscaping fabric lining the trench
then build the wall with the limestone (in this case) and c heap "backwall" behind it. he said i didn't need any gravel besides what i put into the bottom of the trench.

is this correct? seems the backwall would not be good drainage at all... this is a pretty big bank at the end of a 20' lawn or so, with one small roof draining onto it.

i've already put a lot of work in shoveling huge amounts of dirt. i don't want to spend all the money on the stone only to have it heaved apart by front because of lack of drainage. or am i just being paranoid here?

here's what the mason essentially told me to do:


do i in fact need to do this, instead:



additionally, would you use a perf pipe toward the bottom somewhere?

thanks.

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