Here's how to double lap, dutch lap a slate roof and do a valley.
If you FB, like his page and get more udates, etc. https://www.facebook.com/photo.php?fbid=150790875008121&set=a.150761068344435.40764.100002316297232&type=1&theater
You have to Woody, to taper the transition. To stop dead could leave a 2" or thicker spot that couldn't be hidden. And it does add to the asthetics of the roof as another benefit. Form follows function in this case. :)
Interesting. I don't understand why they continued the valley fishtailing up to include the top 2 courses, though.
Here's another pic of the same type valley.
Just like shingles, which they are, only easier. :laugh:
That's quite interesting!
Far beyond my abilities.
Never nailed down a single slate or tile in my life.
:dry:
RoofersCoffeeShop