Asked by: Vivencio Naveed
business and finance construction industry

How do you calculate blocks for retaining walls?

Last Updated: 30th June, 2020

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Divide the width of the wall in inches bythewidth of the block and round up, this is the numberofcolumns. Divide the height of the wall in inches bytheheight of the block and round up, this is the numberofrows. If the top row will be a cap block, then the numberofcap blocks needed is the number of columns.

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Likewise, how much does it cost to install a block retaining wall?

Retaining Wall Cost Most homeowners find themselves spending between$3,202and $8,402. The cost of retaining wallmaterialsranges from $3 to $40 per square foot. Wall blockpricesfall between $10 and $15 per square foot, while precase,pouredconcrete runs $20 to $25.

Also, how deep should the footing be for a retaining wall? To keep the bottom row of blocks from pushingoutward,bury the lowest section of a retaining wall. Thegeneralrule of thumb is to bury about one-eighth of the height ofthewall. For example, if your wall will be threefeet(36 inches) tall, the first course of blocks shouldstartfive inches below soil level.

Also asked, how do you calculate building blocks?

Measure the length and height of theblockin inches and then substitute the values in theequationsquare feet of block = (length ofblock x height ofblock) / 144. For example, astandard cement blockmeasures 16 x 8 inches, so it covers0.89 square feet — (16 x8) / 144 = 0.89.

What is the cheapest type of retaining wall?

In order of price, these are some costs for retainingwallmaterials:

  • Treated pine and is the least expensive material.
  • Hardwood is more expensive than treated pine.
  • Concrete sleepers are more expensive.
  • Besser blocks are relatively expensive to have installed.
  • Interlocking concrete blocks come in a variety of prices.

Related Question Answers

Blanch Izargarate

Professional

Who is responsible for a retaining wall between properties?

They are not normally a matter ofjointresponsibility for neighbours because aretainingwall is usually of more benefit to one neighbour.Themaintenance of a retaining wall is theresponsibilityof the property owner whose land theretaining wallbenefits.

Iosif Soliman

Professional

How long do retaining walls last?

How long will my retaining wall last? Forapermanent wall structure, the general lifespan isgenerallybetween 50 and 100 years. This does, however,depend on theconditions of the soil and groundwater at yoursite.

Connie Deverell

Professional

How much does a 4 foot retaining wall cost?

They may be many lengths and heights, and maybemade of a variety of materials. The average homeownerspendsaround $40 per square foot on having a retainingwallinstalled. For a wall 4-feet high and25feet long, made of dry stacked concrete blocks, thismakesthe cost around $4,000 on average.

Morteza Shalom

Explainer

Are poured concrete walls cheaper than block?

Poured walls tend to be the preferred choiceofnew construction builders. It is faster and more efficienttoconstruct a poured wall but can be expensive if thecementplant is far away. If the concrete truck has totravelfarther than 90 minutes, a cinder blockwallfoundation would probably be the betterchoice.

Gyunay Hintzsch

Explainer

How much does a 6 foot retaining wall cost?

Retaining Wall Cost. An averagebrickretaining wall that is 30 feet long and 4feethigh, without any built-in steps or extrareinforcements, istypically around $4,220. The averagehomeowner will pay $35per square foot and spend between$2,450 and $6,650 to builda retaining wall.

Gadiel Corporales

Explainer

How tall can you build a retaining wall?

The Maximum Height. As a general recommendation,themaximum height of a properly built stacked stoneretainingwall is 5 feet under ideal conditions—thegrade behindthe wall is flat and the soil issandy.

Cleofas Xing

Pundit

What materials can be used for a retaining wall?

B. 10 Retaining Wall Materials
  • Concrete Blocks. Concrete blocks are a very modernandsophisticated material.
  • Stone veneer. Stone veneer is a protective material that canbeused as a decorative covering for vertical walls andsurfaces.
  • Poured Concrete. Advertisement.
  • Brick.
  • Wood.
  • Boulders.
  • Gabion.
  • Timber.

Ianko Vargas

Pundit

How many blocks can build a 3 bedroom flat?

While an average 2-bedroom flat will requireabout2,200 blocks for construction, an average3-bedroomflat will require about 2650blocks.

Raeann Ablaev

Pundit

How many bags of cement do I need to lay 100 blocks?

That being said, one bag of mortar, weighing70lbs. Mixed with sand in the proper 3 to 1 ratio will lay40twelve inch blocks or 50 eight inch blocks. So,iflaying 8 inch block, you should be able to lay100blocks with 2 bags of mortar.

Ercilia Culmsee

Pundit

How do you calculate a block?

Once you have the wall measurements, calculate thesquarefootage by multiplying the width times the height.
  1. wall sq. ft. = width × height.
  2. block sq. ft. = (16 × 8) ÷ 144 = .89 sq. ft.
  3. blocks = wall sq. ft. ÷ block sq. ft.

Laure Kowalewitz

Pundit

How much does a block cost?

Cinder blocks don't vary muchincost regardless of the type. While some capstonescancost as little as 95 cents apiece, the averagecostof a cinder block is $1 to $3 each.

Patrice Neihaus

Teacher

How many blocks are in a cube?

Concrete Block Size and Weight
W x H x L Description Units per Cube
6x8x16 6” Haydite Line Block (Window Corner/Jam mixedincube) 144
8″ Concrete Block
8x8x16 8” Concrete Line Block (Window Corner/Jam mixedincube) 90
8x8x16 8” Concrete Solid Top Block 60

Iolanda Rebelein

Teacher

Marcos Rodelas

Teacher

How much sand and cement do I need for 100 blocks?

As a general rule, you can order around 600 to 800poundsof sand for every 100 blocks you are setting,providedthat you are using the standard size cinder block.You willuse two and a half to three bags of cement mixed inwith thatsand.

Nahila Firnschild

Reviewer

How much is a block wall per square foot?

Cost of Concrete Block Wall
Concrete Block Wall Costs Zip Code Sq. ft.
Basic Better
Concrete Block Wall – Installation Cost $350.00 - $375.00 $400.00 - $435.00
Concrete Block Wall – Total $975.00 - $1125.00 $1275.00 - $1530.00
Concrete Block Wall – Total Average Cost persquarefoot $10.50 $14.03

Corazon Jukovets

Reviewer

Do I need drainage behind retaining wall?

When drainage goes unaddressedhydrostaticpressure will build up behind the wall andcausedamage such as bulging or cracking. There are a number of waystoensure proper drainage of water from behindaretaining wall. And third, is to ask if weep holes willbeneeded to allow water to drain throughthewall.

Sumei Aedonitsky

Reviewer

What is the best retaining wall material?

Retaining Wall Materials Comparison Chart
TYPE OF MATERIAL PROS
Brick Strong and durable
Wood Accessible materials Fairly simple installation
Dry Stone/Boulder The most natural solution to grade change
Gabion Requires no special masonry or skilled labor Greenalternativeby using recycled materials

Ferreol Arnal

Reviewer

Do you need a footing for a retaining wall?

But, you want to make sure that your stonewalldoes not move after it is built. It is worth the hardwork.Height (vertical thickness) of the concrete footing:Ifyou're building a really big wall, pour themeventhicker (taller), because the concrete footingwillneed to support more weight.

Domenic Vasianov

Supporter

How thick does a retaining wall need to be?

If your retaining wall is holding back a 1mdepthof garden then it needs to be 225mm thick.Theminimum thickness of a garden retaining wallshouldbe the width of a standard brick @ 112mm.