Here is more good news from DaVinci
! After extensive testing we have discovered that reducing the nails used for installing Bellaforté Slate
from three nails to two does not
impact wind performance. The only nails you need are one in the tab and one on the top right corner. By reducing the number of fasteners needed by 1/3, just think of the time and money that could be saved using this method.
As usual there are a couple of exceptions to this.
1. This method is not yet approved by ICC, so if you install roofs in California or any other jurisdiction where the codes official adheres directly to our ICE-ESR 2119 you should use three nails.
2. In Florida or other coastal regions where you must comply with our Miami-Dade NOA you still will need to use five nails.