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LEED® Information for CastleLite Block Retaining Wall Block

The LEED® (Leadership in Energy and Environmental Design) was developed by the USGBC (U. S. Green Building Council) and is a voluntary consensus based upon a national standard for developing high performance sustainable building sites. The LEED® provides a complete foundation for assessing building performance and meeting sustainability goals over six major categories: Sustainable Sites, Water Use Efficiency (for building), Energy and Atmospheric Pollutants, Materials and Resources, Indoor Air Quality and Innovative Ideas and Designs.

We congratulate you on your decision to include Segmental Retaining Walls (SRW) into your latest construction project. We feel that Segmental Retaining Walls are an excellent choice for the following reasons:

Benefits of CastleLite Block Retaining Wall Block

  • Improved design enhances the long service life of Retaining Wall Block.
  • After the service life of Retaining Wall Block, they can be recycled and incorporated into new products
  • Earthstone Retaining Wall Block requires less excavation and backfill than conventional retaining walls, which lessens the environmental impact
  • Earthstone Retaining Wall Block can have plants incorporated into the face of the retaining wall, which decreases the heat effect when compared to conventional retaining walls
  • Retaining Wall Block can be salvaged and reused
  • Retaining Wall Block are available with mix designs using recycled materials
  • Manufactured locally with local raw materials, which reduces the fuel requirements for manufacturing and transporting
  • The modular design of the block ensures that there is little or no waste of materials. Any unused block can be returned, which can then be crushed and recycled back into new products. This ensures that Retaining Wall Block never need to be placed into landfills. When the retaining wall is demolished at the end of its service life, you can either rebuild with the same material or crush it for aggregate.

LEED Credit for CastleLite Block
Retaining Wall Block

LEED Credit Category LEED Section and Description What CastleLite Retaining Wall Block Contribute
Material and Resources (MR) 2.1 & 2.2 Construction Waste Management – 2.1 for 75% waste  diversion from disposal Retaining Wall Block are modular and  therefore have very little waste. Retaining Wall Block that are left over can be reused on other projects or recycled into more products
Materials and Resources (MR) 4.1 & 4.2 Recycled Content – 4.1 for 10% and 4.2 for 20% total recycled content Retaining Wall Block can be manufactured with recycled aggregates, therefore eliminating the harvesting of virgin materials.
Materials and Resources (MR) 5.1 & 5.2 Regional Materials – 5.1 for 10% and 5.2 for 20% of extracted, processed & manufactured within a 500 mile radius. Our manufacturing plant is local and within a 500 mile radius of our service area. We incorporate over 86% of materials within a 500 mile radius of our plant location.
Innovation in Design (ID) 1.1 – 1.4 Innovation Ideas and Designs Substantially exceed a LEED performance credit in any of the above sections.

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Materials and Resources Credits
MR 2.1 & MR 2.2 – Constructive Waste Management

Retaining Wall Block are modular and therefore can be laid out to minimize cutting, which leads to reduced waste. Typically a retaining wall contractor will order 5% to 8% more retaining wall block units than the project requires because some units will get damaged in handling on the project and they want to ensure they have an adequate number of retaining wall blocks to finish the project. We encourage our customers to return these retaining wall block back to our plant. Any undamaged retaining wall blocks can be resold. Damaged blocks can be crushed and the aggregates can be used in new products. The reusability and recycleability of the retaining wall block will keep the material out of landfills.

We ship all of our products on wooden pallets and we charge contractors for each pallet shipped and we will purchase the pallets when they are returned. This encourages the contractors to return the pallets and reduces the waste created on the project and will keep more waste out of the landfills.

Materials and Resources Credits
MR 4.1 & MR 4.2 – Recycled Content

CastleLite Block has the ability to use recycled concrete aggregates into the Retaining Wall Block mix designs. The recycled concrete aggregates that are used is deemed pre-consumer, so half credit is given. We have a lot of flexibility on the recycled content in each mix design. We manufacture our products using many different mix designs and colors and offer custom work as well. Several factors influence how much recycled materials can be used in any given mix design.

Some of the factors are:

  • Unit weight per cubic foot – We can use more recycled materials in medium weight products than we can in normal or light weight products.
  • Texture or finish – More recycled materials can be added to a precision or smooth finished product than we can with a split face product.Color
  • Some colors incorporate pumice, black/red cinders. The requirement to use those aggregates can reduce the amount of reclaimed concrete used in the mix.
  • Strength requirements – High strength units use more cement and therefore proportionally reduce the effective portion of recycled concrete.

For example – When using a medium weight mix design that still meets the ASTM C-90 designation, the maximum amount of recycled pre-consumer aggregates we can achieve a recycled content amount in excess of 85%.

Materials and Resources Credits

MR 4.1 & MR 4.2 – Recycled Content

Virgin Pre-consumer Totals
Component Weight (Lbs) Weight (Lbs) % Weight (Lbs) %
Cement – Cal Portland 325 0 0 325 13.2
Aggregate – Granite Construction 0 0 0 0 0
Aggregate – Granite Construction 0 0 0 0 0
Colo Pigment – Rockwood Pigments 10 0 0 10 0.4
Recycled Aggregate 86.4 86.4 2130 68.4

We control the material that is being recycled. We crush materials at our plant location to ensure proper gradations are incorporated into our products.

USGBC LEED® MR Credit 5.2 Regional Materials: 20%
Extracted, Processed & Manufactured Regionally

1 Point in addition to MR Credit 5.1

Application of Credit MR 5.1 and MR 5.2

Our Retaining Wall Block products can earn these credits since most extraction of aggregate and sand from quarries and the manufacturing plant are often within 500 miles (800 km) of the project site.


Credits 5.1 and 5.2 are met by the contractor providing costs to the designer for all materials that meet these requirements. The invoice cost it is typically used by must exclude transportation costs. In addition, a letter from the manufacturer should indicate the location for the manufacturing facility and location of the source(s) of extracted materials. Material production sheets can be provided instead of a letter if the sheets clearly state the manufacturing location and resource extraction locations. A single letter from a manufacturer can certify compliance with more than one credit. For example, a single letter can be supplied for retaining wall
block with a recycled content and production within 500 miles (800 km) of the project.

If you have any questions about any of our concrete pavers, retaining wall block or if you need assistance, please feel free to contact us using the link at the top of this page.

LEED Credits Specifications Resources Green Building Products
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