Roger, thanks a lot for this. This is very helpful, since I will be making shingles like this for the building. The sidelap shingles are what the Swiss would have used, and this is exactly what I needed in order to recreate the unique look of this process.
Interestingly enough, if you study the modern roofing tiles prevalent in in Bernese houses, you will find that the appearance of the clay tiles is made to approximate that of the sidelap shingles.
