August 30, 2018

Best Practices for Zero Retaining Wall Failures - Understanding Site Soils


Understanding site soils is necessary before constructing any retaining wall, and can lead to an efficient, structurally sound design.

For commercial projects, a geotechnical report should include parameters and recommendations for sub-soils.  On most residential projects, some more assumptions may be necessary when assessing soil.  Just remember to be conservative in design to avoid potential problems.

If poor soils are encountered during construction, consult with the owner and geotech for their removal and replacement recommendation. The on-site soils engineer should ensure they meet or exceed design soil parameters. For more information, see sec. 3.1 Foundation Soils in the Allan Block Spec Book.  (ref. BP, Chapter 6.2)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.

August 28, 2018

Best Practices for Zero Retaining Wall Failures - Allowable Foundation Soils


The soil below your Allan Block wall have a significant effect on the wall’s stability.  Foundation soils should be inspected by the on-site soils engineer to ensure they meet or exceed design soil parameters.  A geotechnical report should include parameters and recommendations for sub-soils.  If poor soils are encountered during construction, consult with the owner and geotech for removal and replacement recommendations.  For more information on soil preparation consult section 3.1 Foundation Soils in the Allan Block Spec Book.   (ref. BP, Chapter 6.1)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.

August 24, 2018

Vertical Endeavors - Building Vertical Concrete Walls


So you’ve decided to build yourself a patio using AB Courtyard. You must have a lot of questions. Where do I start my AB Courtyard wall? Where do I end it? How do I end it? Will my husband or wife like it? While we cannot guarantee the satisfaction of your spouse, we have answered a number of your other questions in our Courtyard Installation Guide.

Without opening the guide, where do we start? A good rule of thumb is to always start at a spot that you absolutely have to hit exactly. Are you terminating your AB Courtyard wall into the side of your house or another existing structure? That’s a great place to start building your wall. Chances are if you are terminating your AB Courtyard wall into an existing wall you’ll want a vertical end. We have two options for terminating an AB Courtyard wall panel vertically. You can terminate your panel with a vertical cut end or a vertical finished end.




If your wall is terminating into the side of an existing structure we recommend a vertical cut end. As the name indicates, to terminate a wall section with a vertical cut you will need to cut blocks. Once you have a center-split Dublin and an end split Dublin you’re ready to start building your vertical cut end. It’s as simple as stacking your four cut pieces in the order shown below until you have reached your desired wall height. The video below shows this process, as well.


What if you want to have an opening in your wall, but you don’t want to build a post? That sounds like a perfect application for a vertical finished end. To construct a vertical finished end you will need to cut every other corner block as shown below. In order to determine where exactly to cut your corner block simply lay your first two courses of wall and finish the first course with a corner. Next, place a single York and a single corner on top of that first course as shown. Then, you will measure the distance from each angled end of the second course to the flat end of the first course. You will then mark that distance from the flat end of the second course. 

Always ensure that you are cutting a small angled piece from the angled end of the block as shown. Once you have completed your cut and verified proper fitment, feel free to use this block as a template for all other corner cuts as they should not change in size. The video below will walk you through this process as well.

By utilizing vertical cut ends and vertical finished ends, you can build your AB Courtyard patio to terminate into a house, a post, a gate or any number of structures. The possibilities are endless with AB Courtyard.


For More information visit our website at allanblock.com


August 23, 2018

Best Practices for Zero Retaining Wall Failures - Water Application Construction



When a wall is constructed to be a water application such as in a lake, stream or detention basin, extra steps need to be taken.  The wall rock should be placed to the limits of the geogrid lengths up to a height equal to 12 inches (30 cm) higher than the determined high-water mark.

The drain pipe should be raised to the low water elevation to aid in the evacuation of water from the reinforced mass as water level fluctuates.

Embankment protection fabric should be used under the infill mass and up the back of the infill mass to a height of 12 inches (30 cm) higher than the determined high-water mark.  Embankment protection fabric is also used to stabilize rip rap and foundation soils in water applications and to separate infill materials from the retained soils.

For walls having moving water or wave action, natural or manufactured rip-rap in front of the wall to protect the toe of the wall from scour effects is recommended.  (ref. BP, Chapter 5.2)

Allan Block is working to achieve our industry initiative of Zero Wall Failures. With our Best Practices Manual and experience in the industry we are trying to expand the knowledge base for the design of segmental retaining walls (SRW's) by communicating and educating the professionals in the industry.  To see the full Best Practices Manual, visit allanblock.com to download today and keep an eye out for more industry Best Practice recommendations here.