"Here in California, and in particularly the San Francisco Bay Area where we're located, they update the earthquake building codes every few years. Walnut Creek based landscape architect Joseph Heuttl deals with earthquake codes every day. All retaining walls must conform to local building codes which can vary by region, climate and soil conditions. Both influence strength and visual appeal within a landscape.
Retaining wall design varies in both method of construction and alignment. The cost options for each should be investigated before making a decision, and be sure to verify whether local building codes will accept a seatwall in lieu of railing. For those who find a railing unattractive, there is the option of integrating a seatwall into the top of the retaining wall instead. When the patio is 30" above the surrounding grade or higher, it requires a railing as shown here. When the wall reaches its designated height, a capstone will be attached to the last course of block to seal it against rain and runoff.Ī raised patio created by retaining walls will be subject to building safety codes. The next layer of block and gravel is laid on top of the geogrid, and this may be repeated at designated intervals specified by engineer, manufacturer or landscape architect. This flexible plastic grid is laid on top of a course and the corresponding gravel layer extending all the way back to the slope. A geogrid may be used to act as a deadman to help stabilize the wall. Step 6 - Apply geogrid with additional courses. For other types, gravel may be added as courses are laid. Some kinds of block require a special porous structural backfill that's a lot like concrete which binds blocks.
#Building a retaining wall install
He may also install the base of a waterproof membrane or filter fabric against the slope to further protect the wall from hydrostatic pressure. At the second course the contractor will lay more gravel and set a corrugated perforated drain pipe spanning the entire length of the wall. At this point a variety of things may happen at the same time because drainage structures often here in order to gather water at the lowest point. This course is the most important and sets the base for the entire wall, so a string line for accuracy is vital to proper level. Step 2 - Lay and level the first course of block. Step 1 - Dig an anchor trench to the dept specified by the manufacturer to provide a gravel base that sets the first course of block at the designated level, which is usually a few inches below grade. Discover how the right retaining wall design can add structure and beauty to a sloped landscape Step by Step Installation of a Retaining Wall System
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