How many times have you seen retaining walls that are bowed, broken or have been lifted out of the ground? This is caused by erosion; the down-slope creep of soil and other material under the force of gravity. These forces of nature are the reason for most of the damage to these structures. So when building a retaining wall you should consider the purpose of the wall (esthetics value or functional value).
Esthetics Value - If the Retaining Wall is for a back drop to show off your garden you can use patio blocks or flag stone, or other stackable materials. It will look nice and be a conversation piece for friends and family. These stacking blocks are very popular and sold at most home improvement stores (Home Depot, Lowes). The designs that can be created are amazing! The really creative designs can be found on magazine covers and web page banners. They look nice, but offer very little protection against erosion.
Functional Value - If you have mud in your driveway every time it rains or water pools on your lawn because the neighbors house sits higher than yours, you need a Retaining Wall to hold back the water and erosion. Water will always find its lowest level. Some Retaining Walls have dual functionality, as they are also used as sitting walls or around a patio.
You can Build Your Own Retaining Wall that will be steady as a rock during deep freeze in winter and withstand the heavy pressure of erosion and be maintenance free.
Before you begin consider the following:
Calculate, the size of the project and the amount of material needed (always add 10% more than you need)
Footings, use 2x8 or 2x10 lumber, and Should be below the frost line.
Rebar, use at least 1/2 " if not 1" raised from the bottom of the footing.
Vertical Rebar and 6" horizontal concrete mesh.
Concrete, use Type M ready mix for the footings (and Yes, it does make a difference).
Mortar Mix, use Type S to lay the block (and Yes, it does make a difference).
Concrete Block, use 8x8x16 common block (buy half blocks or cut your own).
Drain Tile, use perferated drain tile, prepped and properly placed at the bottom of the wall. This is important: if you are not sure of this task go to [http://www.homeownerdiy.net] (faq page 3) to see the proper placement.
Cap blocks, use 4x8x16 solid cap blocks (the Retaining wall must have a cover).
Finish coat, will vary (see the DVD Video Clip.)
This is your guide to a durable Retaining Wall that will hold back the erosion and last for many years. Add up your total cost for the materials, then get an estimate from a contractor. The price difference is money you save and you don't have to worry about shoddy workmanship.
Check your Local Building Codes (you may need a permit).
Good Luck with your DIY Project! You Can Do This !
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