The pictures below document the installation of a Sieger heavy duty snow guard on a slate roof. While retrofit hook snow guards are quick and simply installed, there is a case to be made regarding the fact that the nail is already serving a purpose of holding the slate in place. If you are looking for a heavy duty, “forever” snow guard installation, this is a solid way to go about it.
The above picture shows two removed slates with a notching for where the snow guard strap will fit into place. This is necessary when the snow guard strap is rather thick and will impede the slate that will lay over it.
The Snow guard is then secured into place using 2 decking screws
As additional protection towards leaks, a bib flashing is nailed over the guard strap.
The slate is then replaced using a slate hook. Voila, this is a strong and secure way of installing guard.