How To Build A Spray-In-Place Concrete Fence - Monolithic

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needs to be established. Here again it is wise to check your local city ordinances. In many places a fence over three feet tall in the front of the house is not allowed. In other places a fence has a maximum height in the back of eight feet. You will find the fence ordinances vary everywhere in between. Normally a six foot fence is acceptable for everything but front yards, where they may be hazardous to motorists, especially on a corner lot. The best choice is get the rules. The spray-in-place concrete fence is amazingly versatile. There are many creative options for layout and design. On a straight line fence (right) the wind pressure and vibration can often enlarge the post holes and eventually push the fence over or snap the posts at ground level. Because of the zigzag, pressures act very differently on this fence (below) from those of a straight fence. The 2” thick fence with a one foot offset zigzag acts as if it were a two foot thick fence. Pressures applied act to turn over the fence rather than to break it off at ground level. It is much more stable Straight Fence vs. Zigzag First you will want to decide whether or not to build a straight fence or one with a zigzag. Both types of fences, the straight line and the zigzag, have advantages. You must decide which of the two fences is most appropriate for your application. The Straight Fence — Advantages The straight line fence is the traditional fence. It obviously can follow precisely along given property lines, and is utilized in most neighborhoods. The straight fence has a series of posts, in line, all standing vertically. These posts acting together, in concert, keep the fence standing and prevent it from tipping over, even when loads are applied, such as: high winds, some one backing into it, or something piled against the fence. A straight fence has the advantage of taking the least amount of land and being an exact delineator between two properties. The Straight Fence—Disadvantages The straight fence’s main disadvantage is strength. Expansion and 4
Well laid-out plan for a zigzag fence (above). It would be even better if the ends of the fence by the driveway had doubled fence posts, a box (see drawing page 5), or a turn to give greater stability and a more finished look. contraction is more severe especially for long straight runs of fence. Twice as many posts need to be installed because they are all that hold it up. The posts need to be a little larger in diameter and be deeper in depth. Consider wind pressure: A wind blowing 100 miles per hour against a vertical fence will push with 50 pounds per square foot against the fence. If the fence is six feet tall that means there is 300 pounds of push per foot down the length of the fence. The taller part of the fence has a lever action against the ground which increases its propensity to roll over. In other words, the taller the post the more leverage it exerts. This 300 pound push is considered in average three feet above the ground. If the posts are eight feet apart and we have an average of 300 pounds of push, that equals 2400 pounds of push on one fence post. That fence post must be able to resist snapping off at ground level and the post hole must resist enlarging to prevent turn over at ground level. If the hole starts to enlarge even a little bit, the fence tends to pound the hole larger and larger as the wind hits it and backs off over and over again. A fence that can withstand being tipped over from a one-time push may fail to the buffeting of an intermittent wind. It is therefore very important that the post be larger in diameter and set deep enough to withstand this turn over at the ground line. The Zigzag Fence — Advantages The zigzag fence is much stronger and more durable than a straight fence. It will stand up to expansive soils, wind loads and expansion and contraction much better than a straight fence. It proves interesting by being Note the forms set up for shotcreting (left). This four-foot high fence is zigzagged one foot off center each way. Surprisingly, when completed one hardly notices the zigzags in this fence. The posts have already been poured. The bracing must resist wind until the fence is sprayed and solid. 5
Page 1 and 2: How To Build A Spray-In-Place Concr
Page 3: Step 1 Design the Fence Layout Wher
Page 7 and 8: This particular fence starts with t
Page 9 and 10: Step 2 Install Fence Posts The next
Page 11 and 12: Place the forms vertical and two to
Page 13 and 14: (Above) Drill small holes above and
Page 15 and 16: Step 5 Applying the Shotcrete The n
Page 17 and 18: tor’s experience. Concrete Streng
Page 19 and 20: To Mix or Not to Mix The shotcrete
Page 21 and 22: After the forms are removed spray a
Page 23 and 24: Final color coat sprayed is on the
Page 25 and 26: Appendix In the past 20+ years, we

How To Build A Spray-In-Place Concrete Fence - Monolithic

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