Retrofit snow guards are for installing on existing roofs. You do not have to remove the slates, tiles, or shingles in order to install these snow guards! There are two general types: ones with notched shanks that slide up underneath the shingle and hook on the shingle nail (Berger, Gough, etc.), and ones with a hooked top that slide over the head of the slates (Mullane, Salvo, etc.).
Note: the notched retrofit snow guards have a "reach," which is the maximum distance they will slide under a slate and still hook a nail! 

Measure your slate from the bottom edge to the nail hole in order to determine what reach is required for your particular slate.  Some imported slates have high holes and some longer slates (22 inches long and 24 inches long) may be too long for the snow guards you're looking at. If your reach is too high, use Mullane or Salvo retrofit snowguards! Or custom order Gough retrofit snowguards with extra shank length.

How to determine the reach on your roofing slates when using notched-shank retrofit snowguards.

Items: 115 of 19, per page
SKU Product name   Price  
SG-SRF13 Mullane 100S-RH Retrofit Snowguard
  • $13.95
SG-SRF14 Mullane 200S-RH Retrofit Snowguard
  • $14.00
SG-SRF5 Berger 100 Retrofit Snowguards
  • $5.40
SG-SRF6 Berger Pro 100 Retrofit
  • $6.00
SG-SRF15 Mullane 300S-RH Retrofit Snowguard
  • $12.55
SG-TR4 Mullane 200CPT Retrofit Snowguard
  • $17.00
SG-SYN1 SnowTrapper ST11 Snow Guard
  • $5.75
SG-TR6 SnowTrapper ST Tile (Barb)
  • $5.75
SG-SYN2 SnowTrapper ST9 Snowguard
  • $5.30
SG-FMR21 SnowTrapper ST6 Snow Guard
  • $4.75
SG-TR5 RockyGuard Model RGTile
  • $7.25
SG-FMR16 RockyGuard Snow Guard Model RGW
  • $4.50
SG-SRF30 Zaleski #4C Copper Snowguard
  • $7.50
SG-SYN9 Zaleski #8TC Terne Coated
  • 22% less
  • $7.00
SG-SYN8 Zaleski #8 Stainless Snow Guard
  • $7.00
Items: 115 of 19, per page