Recently, I noticed a couple of roofers on new homes put a thin aluminum sheet in the valley after ice & water Shield was applied. Then, covered it up in the style of closed cut method. I planned to go with closed cut valley method on my roof this month. NCRA never mentioned about installing a thin aluminum for closed cut valley. How common is this idea of putting a metal in the closed cut valley?
Here’s a good instructions on how to install closed cut valley for those who are curious. It doesn’t say about putting a metal in the valley.
Sounds like its a pre-cautious for extra protection.
My question is Is it a good idea?
Please share your opinions.