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Lawn & Garden

Tall Retaining Wall

What wall block would you recommend to build a 4ft tall retaining wall? 
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Posted 2016-07-14T22:40:04+0000  by clayvin clayvin
Hello clayvin.  Welcome to the Community!

A 4 foot wall is at the maximum limit for using stackable, gravity locked retaining wall.  No less than 18" blocks will be needed, as the more common 12" blocks are intended for walls 2 feet high or less.

You will need to prepare a solid base/footer for your blocks, and the first course will need to be below grade.  In many cases, a building permit will be required for walls 3 feet tall and above.  Your local building department may well also supply plans for walls that will meet code.

In areas of heavy clay soils and lots of drainage issues, it may be wise to have a 4 foot wall professionally engineered and installed for you.


Posted 2016-07-15T13:26:09+0000  by Chris_HD_CHI

Hi clayvin,

Welcome to The Community! We're glad that you're here!!

The majority of wall stones that we have in stock at The Home Depot are about 12 inches wide and 4 inches thick. Wall stones of this thickness are only recommended to build a wall up to two feet tall.

Pavestone 12 in. L x 4 in. H x 7 in. D Red Concrete Wall Block (144 - Pieces per Pallet)

You can terrace the wall by building a two foot wall, terracing back 4 feet, and build another two foot wall to achieve the four foot height that you require.

If you don't want to use this method, a larger wall stone can build walls up to 3 feet in height, but walls that require additional height should be engineered beforehand to consider all aspects of the pressures that will affect the wall. Hydraulic pressure builds up and will push through any wall, so water drainage will be required from behind the wall.

Reading through the specifications of different wall stones will uncover discrepancies as to how high a retaining wall should be constructed. Your 4' height is right in the midst of the controversy. Read more about retaining walls here for more information.

Thank you for asking, keep us posted with your results.


Posted 2016-07-15T14:47:38+0000  by Travis_HD_ATL
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