What is the best kind of retaining wall for a very sloped yard We want to extend our backyard and use a 9 foot tall retaining wall and fill in with dirt Need some help with the best kind?

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First get in touch with you local BUILDING OFFICIAL. They will probably have some questions as to what you are doing and why. There may be some restrictions in your area as to height of retention and or the type of materials that can be used.
Next get with an engineer to design anything retaining over 2 feet of fill. It is MHO that ROCK WALLS SUCK! it is not a question of if they will fail, but when they will fail.
My first selection would be concrete if i had to do it myself. I would add a sealer to the earth side of the wall and porous material behind the wall for a minimum of 24" with drains at the base of the wall to allow for hydraulic relief.
JMHO, Hope this helps.

You can get a hold of your local Versa-lok retaining wall business and have them do a engineered planned wall for you. Then have the the landscaper affiliated with that business put it up. They will be able to tell you if it can be done.
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the 5,000 psi is the amount of pressure the concrete can withstandbefore it will crush. it has nothing to do with water proofing. tofind out if you need water proofing you need to know how poores theconcrete is and how quickly the ground out side will drain water.it only takes about 6 psi for water (MORE)

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Yes, if the wall is on the boundary. Also if it is only on your side of the wall and if you own the property. You cannot if it is a pre-cast or removable structure. Also, you shouldn't paint the parts the neighbor can see, if it is a curved or cranked wall.

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What is a crib retaining wall?

a wall constructed of precast blocks (usually concrete) and filled with earth. holds back mass of earth or solid material. http://www.google.com.au/imgres?um=1&hl=en&sa=N&rlz=1C1CHKZ_enKE430KE430&biw=1366&bih=643&authuser=0&tbm=isch&tbnid=xqGeJAPRgcDblM:&imgrefurl=http://www.answers.com/topic/re (MORE)

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Will homeowners insurance pay to have a retaining wall installed in your yard due to slope eroding?

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