The Czech architecture firm A1Architects has really embraced charred wood siding, specifying it in many of their projects. They have done a beautiful job integrating and featuring this natural and striking material.
The siding they used has what we would call a “medium char” on it, with more of the browns and greys of the underlying wood shining through the char layer. This thinner char layer is less durable than a deep char, but provides its own unique and beautiful aesthetic. Furthermore, if weathering proves to be an issue with the medium char siding used in this project, it is always possible to add a clear-coat or stain to the siding once it has been installed.
Take a look at a beautiful garden teahouse they designed and built in Prague: