R&D: German Engineering in the Chimney Industry
Chimney tools have definitely changed over the years. The original chimney sweeping tools in Europe were bristle brushes. We also have records as early as 1432 showing grown men in Vienna sweeping large chimney shafts while clad in leather jerkins. The Germans and Austrian sweeps used a scraper tool for so long that it is celebrated in the logo of the federation of German sweeps today.
The current undisputed leader of German research and development for chimney inspection tools is Wohler, a solid 100 year old Mittelstand company in the center of Germany. What is a Mittlestand company? According to Wikipedia, it describes a company that is “highly focused, achieving unprecedented efficiencies by designing a business model with a razor-thin focus and learning to do the one thing really well.” Yup, that’s Wohler. They are known for making very high-quality cameras. Little is known about their device for chimney integrity testing as we don’t use this type of inspection in the United States. Yet. But I learned that it is the only way to objectively test a chimney’s integrity. The sweep places a foam block in the top and bottom of the chimney, and connects the Wohler DP600 machine. The machine applies a light pressure in the cavity and measures the leakage rate, comparing it to a known permissible leakage rate. It is pass/fail. No guesswork. That is cutting-edge chimney technology.
But one of the best sweeping innovations that I saw in Europe wasn’t so much in the tools, but in the building designs themselves. The rebuilding of Germany after WWII resulted in a unique opportunity; Most of Germany’s residential housing was rebuilt with non-combustible materials and included access points for ongoing building maintenance. In the case of chimney design, they used an air-cooled, masonry modular system. Similar to clay flue tiles in masonry fireplaces in the USA, they built chimney stacks in the center of their buildings to serve the more efficient German boilers and furnaces. Their modular air-cooled masonry chimneys are so sturdy that several chimney sweeps literally burn out the creosote when they cannot sweep it out. The tool used is a weed-burner torch, fueled by propane. The process is called a controlled burn.
The chimney fire controlled burn takes about 2 hours, and the sweep returns later to sweep it out and ensure it is safe. We have videos of this intentional ignition and burning process, which is scary for us American sweeps, and even some Germans. However, some Germans still use this controlled burn technique for removing creosote. Warning: Please do not try this at home in your wood framed house!
A household level awareness of the chimney sweep industry
Its the dream of every marketing department to make their brand become a household name.
The German chimney sweep logo is very recognizable throughout their country as they have the unique advantage of being connected through a central guild. And the sweeps dress for success. Black leather trousers, black double-breasted jackets with two rows of brass buttons and a white kerchief around the neck. I found myself buying gear and wearing the logo with pride, even though I was an American, because I was connecting myself to this massive body of men and women in the chimney sweep trade.
The annual government-mandated sweeping of chimneys in countries like Germany, Austria, and Switzerland provides the power of being a legitimately powerful profession on a culture level. In Europe the chimney sweep is a known commodity. The industry has done a remarkable job of promoting the image of the sweep as a trusted, helpful sort. Through marketing, toys, and lots of swag, the perpetuation of the chimney sweep as a symbol of good luck is no accident.
So what do you want to be when you grow up? A fireman, a teacher, a chimney sweep. Tools. Gear. Tackle. Trim. Handwerk. We are chimney sweeps. This is what we do.