Most of us don’t have a commercial plaster spraying machine lying around, so we can’t just run out to the garage and turn it on. That said, the benefits of using a commercial plaster sprayer are well worth investigating the availability of one in your area either to rent or to hire out (the entire job). If you have access to a commercial sprayer, it’s an incredible machine that will speed your process up dramatically. You have seen me post in the past about sprayers that we as consumers can use with great effectivity. I am still a big fan of these sprayers and highly recommend them; however, the commercial sprayer shown here, and others like it, is a big step up in power and production.
These machines have the mortar mixer built right in so you can literally mix the material and dump it straight into the pumper. The pump then drives the material down the hose and provides a constant stream of plaster. Because we have to mix the scratch and brown coats of natural hydraulic lime plaster for a minimum of 20 minutes, it’s best to have a secondary mixer on site as well so that you can work between the two to keep the flow going.
I have included some video footage of the sprayer in action on the Flathead Lake, Montana straw bale workshop from this past year. Rather than tell you about the benefits, I figured I would just show you. If you have ever plastered, you will see the advantage right away. If you have never plastered, let me tell you that the main advantage is the speed and ease of application. It still takes several people to do the work, but less than a hand applied crew.
The first video is of the scratch coat application on the interior of an exposed timber frame. The ability to quickly “cut in” around the timbers and ceiling line is immediately apparent.
The second video shows plastering on the tall gable ends. If nothing else, not having to transport the mud to the top of the scaffolding makes this machine well worth having on site. Keep in mind that even with the other sprayer I use, one would still have to transport the mud to the point of application.
The final video is of the finish coat application. Note that there are two trowel finishers in addition to the two men running the sprayer. It is also necessary to have someone making the mud. That means you are looking at at least 5 people for the crew. That’s better than the 15 people I used to have on my plaster crew that did everything by hand application.