Shot-crete continued, July 6, 2015

I want to finish the shot-crete story…..a few weeks ago, I showed you the process of a concrete foundation repair on a duplex I own in NDG. The repair was with a product called “shot-crete” – a dry concrete shot through a gun under pressure to stick on a wall or other surface.

Here are a couple of pics of the finished foundation:



As you can see, the windows are installed and the final parging is accomplished. The only chore left to do is the landscaping and repairs around the front porch.

The use of shot-crete has its advantages: the original wall does not have to be removed, the building does not have to be supported, forms are not necessary (so that step and associated costs is avoided), the process is quite quick and the concrete has high compressive strength.

On the other hand, after the experience, it also has its disadvantages: it is messy with lots of over spray to be cleaned up and “spume” in the air that is the equivalent to dust that covers everything, it is noisy, and in the end, there is a lack of control in the way it is placed, the the result is an “artisanal” look as opposed to a clean line of concrete coming out of a well-made form (take a look at the exterior corner in the second photo above). There is a lot of parging that has to be done after the shot-crete is installed and there is a variation in colouring in the various concrete applications that could bother a perfectionist. It also adds thickness to the wall, so now my front foundation is 24″ thick….pretty deep window wells, especially when the windows are small like mine!

It is a “quick and dirty” solution that sacrifices control over speed.  In the end, I think is is more suited for a large structural job than for a residential project.


About jhcarpentry

I am a teacher in the Construction Carpentry Program at the Chateauguay Valley Career Education Centre (CVCEC) for the New Frontiers School board. This blog is a way for me to connect with my students.
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