wood retaining wall, drainage

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Old 02-02-09, 02:48 PM
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wood retaining wall, drainage

HI,
I am building a series of terraces in my downsloping back garden and am looking for some drainage advice.

I am building 4 walls, each 3ft high and 20 ft long using pressure treated 4x4's and 2x12's running horizontal to the ground. I was wondering how much drain rock backfill I need to use behind the wall for drainage. Is 4 inch deep starting approx 4in below the bottom 2x12 board, up to approx 6in below the top of the 2x12's sufficient or too much?

Do I need to use a preforated drain pipe at the bottom of the gravel backfill to slope the water away.

Should I surround the drain rock on 3 sides with landscape fabric (ie on the soil side, the board side and the bottom)

Are 4x4's sufficient?

thanks
derek
 
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Old 02-20-09, 01:15 PM
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hey u may want to check out my thread i just put up.. its about problems i'm having with my wood retaining wall, could save you some time in the future!

http://forum.doityourself.com/landsc...ml#post1525840
 

Last edited by Newt; 02-20-09 at 01:40 PM. Reason: Add link to other thread.
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