Jun 8, 2017RETROFIT SNOW GUARDS - CALCULATING THE "REACH":When retrofit snow guards are used on existing roofs, they are typically installed without removing any slates or tiles. The notched shank snowguards have a limited "reach" however, and if your nails are too high, you won't be able to reach them to hook the snowguard into place.
We have Gough 24 Ounce Copper Snow Guards for new roof installations or for retrofit situations. Retrofit snowguards are for installations on new or existing slate roofs. All other snowguards are for installations on new slate roofs.