Multiply the length of the wall by the desired height, then divide this number by 81 to determine the amount of backfill gravel needed. Add the backfill amount to the base amount to determine the total cubic yards of gravel necessary for completing the wall.
How do you calculate backfill?
For example, find the cubic footage volume of a backfill area that is 8 feet wide, 6 feet deep and 50 feet long. The volume of a rectangular cubed shape is found by the formula v = l x w x d , where v represents volume, l is the length of the trench, w is the width and d is the depth.
How much gravel goes behind a retaining wall?
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.
How do you calculate the area of a filling?
Perhaps the simplest (but most time consuming) method is to plot the sections on gridded paper and count the grid cells of the cut and fill areas. Multiplying the cell count by the area represented by each of the grid cells gives the cut or fill area for the section.
How do you calculate material for a retaining wall?
Multiply the length of the wall (in feet) by the height of wall (also in feet) to get the square footage of the outside face of the wall. Then, multiply 1.12. This allows for having 12% of the wall's height under the surface of the ground to give the wall more stability.
How is backfill stone calculated?
Multiply the length of the wall by the desired height , then divide this number by 81 to determine the amount of backfill gravel needed. Add the backfill amount to the base amount to determine the total cubic yards of gravel necessary for completing the wall.
How is Earth's filling quantity calculated?
Area of the plot = Length x Width = 40 x 30 =1200 sft. Suppose we need to fill the plot by 3'5” = 3.41 feet. ∴ Depth of the plot = 3.41 feet. Volume of plot to be filled = 1200 x 3.41 = 4092 cft.
Does a 2 foot retaining wall need drainage?
These walls need a drainage system regardless of the wall height . If there are poor draining soils such as clay behind the wall, there needs to be drainage incorporated the wall system. Clay when wet is very weak, so it is essential to provide a way for water to escape from behind the wall.
How do I calculate how much retaining wall I need?
To calculate the volume of retaining wall we need to calculate the volume of retaining wall. Here I have divided the retaining wall into two parts, part A is the base slab and part B is the stem of retaining wall. So Volume of retaining wall = Volume of base slab + Volume of stem . The stem is a trapezoid.
Does a 4 foot retaining wall need drainage?
The design and performance of most retaining walls are based on keeping the area behind the wall relatively dry. ... Any reinforced wall or walls over 4 ft. (1.2 m) in height or with slopes or other surcharges above the wall will need a toe drain .
How do I calculate how much soil I need?
- Determine the length and width of the area you want to cover with soil. ...
- Calculate the area, multiplying the length by width. ...
- Establish the depth – thickness of the topsoil layer. ...
- Multiply the area and dirt layer thickness to obtain its volume: 56 * 0.5 = 28 yd3 .
How do you calculate backfill and excavation?
- Backfill volume = excavation volume – footing volume – wall volume. ...
- (Note that only the portion of the wall that is in the trench is deducted, so the height of wall in the trench is the average trench depth minus 2′-0” for the footing: 6′-0” – 2′-0” is 4′-0”)
- Backfill volume = 207.4 cubic yards.
How do you calculate sand fill?
- Measure number of square feet in the area.
- # of square feet x depth in feet = # of cubic feet.
- # of cubic feet /divided by 27 = # of cubic yards.
- # of cubic yards x (unit weight in pounds / 2000) = # of tons needed.
How do you calculate retaining wall stones?
Use This Simple Formula
Use this equation to figure out how much stone you need to build a stone wall: (length in feet x width in feet x height in feet) / 27 = cubic yards of stone needed .
How do you calculate pavestone?
- Multiply the length and width (in feet) of the area you're paving.
- Multiply the length and width (in inches) of your bricks or paving stones.
- Divide the brick or paver's surface area by 144 to convert to square feet.
- Divide the total paving area by the paver's surface area.
What to backfill a retaining wall with?
Backfill the wall with gravel or sand . If you use sand, first cover the backside of the retaining wall with landscape fabric. This will keep the sand from seeping between the blocks. If you're backfilling with gravel, you can pour the gravel after every course you lay.
How much gravel do I need to fill an area?
When planning to fill in your desired space, remember that gravel should be 8-inches deep minimum . The following measurements are a general guide to the amount of gravel coverage per cubic yard 1 cubic yard = 3” depth for 100 square feet.
Do you need landscape fabric behind retaining wall?
Whether the wall is made from stones, bricks or wood, it is important to provide a barrier between the building blocks and the soil. ... Landscape fabric is thin and sturdy and is a simple way to preserve a retaining wall's construction.
How do you calculate gravel fill?
Length in feet x Width in feet x Depth in feet (inches divided by 12). Take the total and divide by 21.6 (the amount of cubic feet in a ton). The final figure will be the estimated amount of tons required.
How deep should the footing be for a retaining wall?
The general rule of thumb is to bury about one-eighth of the height of the wall . For example, if your wall will be three feet (36 inches) tall, the first course of blocks should start five inches below soil level. The gravel base should start three inches below this.
Do you need a French drain behind a retaining wall?
If you're building a retaining wall, add a French drain behind the first course of stones or blocks . Otherwise, water moving down the hill will build up behind the wall and undermine it. The pipe should rest on the same compacted gravel base or concrete footing that supports the wall.
How do I calculate my cubic Metre for a retaining wall?
- quantity calculation of cement for retaining wall. Volume of cement required. 1m3 = 35.3147 cft. ...
- quantity of sand the required for retaining wall. Volume of sand in cft. = (1.5/5.5) ×50.82×35.3147=489.46cft. ...
- quantity of aggregate required for retaining wall. Volume of aggregate in cft. = (3/5.5)×50.82×35.3147 =979 cft.
How much should I charge to build a retaining wall?
On average, building a retaining wall costs $23 per square foot . For the more budget-conscious, retaining wall prices average at $19 per square foot. On the upper end, retaining wall costs are around $50 per square foot.
What do you use for drainage behind a retaining wall?
Gravel Backfill
For proper drainage, the first 12 inches of space behind a retaining wall should be filled with crushed stone or gravel. This is so that when water gets into the space, it does not become bogged down in soil but instead can flow down the wall to the drains or weep holes.
Can you use pea gravel behind retaining wall?
Pea gravel is a common landscaping material because it is easy to with and cheap. ... When building a retaining wall or garden border or setting fence posts, backfilling with pea gravel instead of sand, crushed limestone or other materials has benefits.
How far apart should retaining wall posts be?
Retaining wall posts should be at least three feet apart . The distance can be slightly longer or shorter if it works better with your measurements. However, you shouldn't go more than seven feet apart to make sure your wall is sturdy enough.
How many tons is 3 cubic yards of sand?
Typically, 1 cubic yard of sand yields about 1.35 tons, in this regard, “how many tons in 3 cubic yards of sand”, so there are 4.05 short tons in 3 cubic yards of sand.
How much dirt does it take to fill a hole calculator?
Length in feet x Width in feet x Depth in feet (inches divided by 12). Take the total and divide by 27 (the amount of cubic feet in a yard). The final figure will be the estimated amount of cubic yards required.
How do you calculate capacity?
The Easy Way: Total Production Quantity During a Time Period
One of the easiest ways to measure capacity is to simply use the total production quantity for a given time period . For example, if your plant can produce an average of 20,000 gizmos per week, then your total capacity is 20,000 gizmos per week.
How do you measure truck load of sand?
Ans. :- if length, width and height of inner edge of sand loaded truck is 15′ × 6′ × 5′ respectively, then volume of sand in one truck is calculated by multiplying all inner edge dimension of truck (15′ × 6′ × 5′) is 450 cft, so 450 cft is volume of sand in one truck.
How much sand do I need for a 10×10 sandbox?
This sandbox is large enough for several children. 5,000 pounds of sand are required for a proper level of fill.
How many cubic meters are in a bulk bag of topsoil?
How Big Are Your Bulk Bags? Our bulk bags are approximately 1 cubic meter (for reference these weigh a little under a tonne). It is difficult to be exact as the weight changes depending on how much water and sand is in the loam.
How do you calculate bulk excavation?
So, the formula is: Ab = Wb * Lb , where Wb and Lb are the width and length of the bottom of the excavation. At = Wt * Lt, where Wt and Lt are the width and length of the top of the excavation. In our example, Wb = Lb = 5 and Wt = Lt = 15, so Ab = 5 * 5 = 25 and At = 15 * 15 = 225, and D = 5.
How do you backfill a hole?
- Backfill in layers of 4 to 6 inches, using non-organic fill material that is free of debris.
- Compact with a 1,000-pound compactor, or as appropriate.
- Water thoroughly.
How much does it cost to backfill a trench?
Backfill a Trench: national average cost
The total price for labor per linear foot is $4.57, coming in between $1.60 to $7.54 . A typical 50 linear foot project costs $228.34, with a range of $79.89 to $376.79.
What percent is a 1/12 slope?
| Degrees Gradient Percent | 4.76° 1 : 12 8.3% | 7.13° 1 : 8 12.5% | 10° 1 : 5.67 17.6% | 14.04° 1 : 4 25% |
|---|
How do you calculate a 2% slope?
To calculate percent slope, divide the difference between the elevations of two points by the distance between them, then multiply the quotient by 100. The difference in elevation between points is called the rise. The distance between the points is called the run. Thus, percent slope equals (rise / run) x 100 .
How do you calculate the thickness of a retaining wall?
- Base width = 1/2 to 1/3 of the height of the wall.
- Base thickness = 1/8 of the height of the wall but not less than 12 inches.
- Stem thickness = 6 inches + 1⁄4 inch for each foot of wall height.
- Stem located on base so that 1/3 of total base width projects forward from the face of the stem.
