I'm glad to hear that the modern asphalt shingle does not permanently bond with Grace Ice & Water Shield.
That's good information.
Tell me what you would use on my roof instead of a full covering of Grace Ice & Water.
I'm always interested in monumental savings.
About the Skylight ......
As mentioned in my original post, my home was built in 1990.
The windows were all wood/aluminum double pane w/argon between.
The skylights are the same type of construction. ( Velux )
All windows would sweat and frost in the lower corners during sub-zero weather.
The finish deteriorated and the wood aged and darkened.
It was impossible to keep up with the refinishing.
The front door also has a large panel of dual pane glass that had the same problem,.
I have a house air exchanger, and it controls the humidity level.
The humidity is kept low to minimize the problem.
Two years ago I had most of the windows replaced with vinyl windows,
The triple pane windows are much better, frost and moisture is not a problem.
Last year I had the patio doors and remaining windows replaced with vinyl triple pane.
Once again, good results.
I had the front door with the large glass panel replaced also.
They talked me into a double pane.
It sweats and frosts like the old one.
The frost melts, and the water runs off the door onto the floor.
So now I have the two skylights to replace.
The Wasco is a triple pane vinyl skylight ...... it's like my new windows.
The Velux is a double pane, and not vinyl...... it's like my old windows.
The Velux has a U-Factor of .45, while the Wasco has a U-Factor of .29.
Which one do you think is going to sweat, ice up, and drip water down my wall?
Considering I have the Wasco skylights in my possession, can you see why I am reluctant to buy the Velux?
"just go get yourself a fixed deck mount Velux skylight with a metal flashing kit and be done with it"
That's the problem, once they're installed, I'm not done with it.
I have to live with it.
Only the installer is done with it.