Gravity walls are built with massive blocks that use a tongue-and-groove system to lock together. They rely on their own weight to hold back the earth behind them. Each block in a residential design weighs approximately one tone and covers about five feet of wall space.
Modular Block Walls. Modular block walls are dry-stacked systems that can generally tolerate movement and settlement without causing significant structural distress at the face because the modular block units may move and adjust relative to each other.
RETAINING WALLS. Redi-Rock is an engineered retaining wall solution being used to create usable land in communities around the world.
A retaining wall is a structure that holds or retains soil behind it. There are many types of materials that can be used to create retaining walls like concrete blocks, poured concrete, treated timbers, rocks or boulders. Some are easy to use, others have a shorter life span, but all can retain soil.
The average weight of a sandstone boulder is approximately 150 pounds per cubic foot. Limestone boulders and granite boulders in most cases weigh more. They average about 175 pounds per cubic foot. To estimate the quantity, you need to convert the area into cubic feet by multiplying length x width x height.
| Stone & Boulder Conversion Tables |
|---|
| Stone Weights (2,000 lbs. = 1 ton) | Boulder Guideline |
|---|
| 6" = 9-12lbs | 6" - 8" = 12-15 sq. ft of wall per ton |
| 8" = 20-25lbs | 12" - 18" = 8-10 sq. ft of wall per ton |
| 10" = 45-50lbs | 18" - 30" = 5-7 sq. ft of wall per ton |
A 1 cubic metre gabion basket requires approximately 1.5 tonnes of stone. The second option is to face the basket with our small walling stone, and then fill in the rest with 50 - 200mm stone. The larger stones require building into the basket instead of being shovelled or tipped in.
Boulders are usually sorted by approximate diameters of: 8-18", 18-24", 24-30", 30-36" and 36-48". Boulders are sold by the ton. A ton equals 2,000 pounds.
Second, a retaining wall must have properly compacted backfill. In order to provide proper drainage, at least 12 inches of granular backfill (gravel or a similar aggregate) should be installed directly behind the wall. Compacted native soil can be used to backfill the rest of the space behind the wall.
Shop Craigslist and Freecycle
Craigslist and Freecycle can be a good source for free rocks, but you'll have to check both sites regularly and be quick on the draw when an offer comes up.Very VERY few rocks weigh less than water (and float), but quite a few types of rocks weigh more than the 'average weight', so a rock about that big would weigh BETWEEN 8 and, say, 30 or so pounds, with the average closer to 20 pounds. That's a 'large rock' as opposed to 'a boulder' which is a 'larger size rock'.
The average homeowner spends around $40 per square foot on having a retaining wall installed. For a wall 4-feet high and 25 feet long, made of dry stacked concrete blocks, this makes the cost around $4,000 on average.
Walls vs Fences
However, this comes at a cost; in general, a wall will be much more expensive than a fence. Though on the plus side, you would expect a wall to last much longer, so in the long term, a brick wall is a cost-effective option.Brick siding costs anywhere from $5 to $15 per square foot to install. If you were to install brick siding on an average sized 1,500 sq. ft home you could expect to pay anywhere from $7,500 to $22,500.
You would need a little less than 4 1/2 yards of stone to build your stone wall. But round up and buy at least 5 yards. If you can afford it, get 6 or even 7 yards. You can use any leftover stone that you have in a variety of other landscaping projects, ranging from water features to rock gardens to landscape steps.
Cost of Dry Stack Stone Wall
| Dry Stack Stone Wall Costs | Zip Code | Sq. ft. |
|---|
| Basic | Better |
|---|
| Dry Stack Stone Wall – Installation Cost | $625.00 - $635.00 | $650.00 - $765.00 |
| Dry Stack Stone Wall – Total | $1215.00 - $1275.00 | $1315.00 - $1555.00 |
| Dry Stack Stone Wall – Total Average Cost per square foot | $12.45 | $14.35 |
Under permitted development your gate, wall or fence can be up to 2 metres in height, as long as: it's not facing a road. it does not come any further forward than the 'principal elevation' (the front of your house) or the side elevation (the side of your house) your house is not within a conservation area.
Expect to pay a minimum of $25 per square foot for labor and materials for installing a boulder or rock wall. The hourly cost for building with dry stacking stones is $65 per hour, compared to brick installation at only $15 to $25 per hour.
In this guide,we
take a look at the average cost of hiring professionals to
install a concrete
block wallas a perimeter
fence, 350 feet x 6' tall
block (2100 sq.
Block Wall Costs.
| Item | 4. Labor: 285 hours to install the block wall and 18 hoursto install the footing. |
|---|
| Unit Cost | $34 |
|---|
| per hour |
| Quantity | 303 |
|---|
| Line Cost | $10,302 |
|---|
Cost Breakdown for Stone Wall Installation in Kailua Kona
Direct labor costs to Install Stone Walls in Kailua Kona - between $4,689.77 and $5,041.54. Cost of all materials and supplies which may be necessary for Stone Wall Installation , which may include: - between $53.35 and $57.77.The VAST MAJORITY of brick walls are built on a concrete base. The thickness of the concrete base has a direct correlation to the height of the wall. Therefore YES, one can build a brick wall on a concrete slab. Remember, the thickness of the concrete slab will determine how high the wall can safely be built.
Any type will do, but pea gravel is the easiest to work with.
Wooden Timbers
Wooden timbers and railroad ties are popular choices for creating alternatives to retaining walls. They are especially useful for building raised flower or garden beds and in terracing hillsides. Treated wood provides a natural look and longevity to a landscape's design.Retaining Wall Materials Comparison Chart
| TYPE OF MATERIAL | PROS |
|---|
| Poured Concrete | Stronger than a block wall Variety of design options |
| Brick | Strong and durable |
| Wood | Accessible materials Fairly simple installation |
| Dry Stone/Boulder | The most natural solution to grade change |
A: The reason the EPA has made illegal the use of treated railroad ties in vegetable gardens is the fact that they are treated with coal tar creosote, a pesticide registered both with the EPA and the state of Oregon.
Retaining Wall Cost
The cost of retaining wall materials ranges from $3 to $40 per square foot. Wall block prices fall between $10 and $15 per square foot, while precase, poured concrete runs $20 to $25. Wood falls in the middle at $15 to $25 per square foot.Here are some reasons your property might need a retaining wall.
- You Suffer from Downhill Erosion. If you don't work to control downhill erosion, you will have significant issues on your hands.
- You Have Water Runoff.
- There Are High Winds in Your Area.
- Make Better Use of Your Property.
- Get the Best to Build a Retaining Wall.
Wooden railway sleepers are an excellent alternative to bricks or concrete for building retaining walls in your garden. Sleepers can be used both horizontally and vertically when building a retaining wall.
Behind the top tier of the wall add 6 inches of topsoil and lightly compact it. All retaining walls should lean into the hill 1 inch for every 12 inches of height. Landscape fabric keeps the gravel from clogging with silt, while 4-inch PVC pipe drains most water.
