I never have to shovel my roof. The guards are just to control the snow dumping in front of the doors, the small area (maybe 10 feet of roof) melts pretty quickly after a storm and everything else slides off. I don't have the problem with snow getting stuck in the valleys, the snow slides from those, too. Where the snow comes off onto the deck I do have to shovel that relatively soon after it comes off the roof before it freezes solid, I have always shoveled the deck after a storm anyway.
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