SIKSUKR makes a good point. You can add snow guards to prevent the snow from falling off and in some cases or areas, it would remove the issue of snow falling off. I have a version of these over the roof penetrations to prevent damage to vents.
Two things to consider:
1. If the snow cannot fall off, you have to remove it from the roof to prevent a structural issue, same as you would with Architectural shingles. Metal roofing will melt the base layer of a snow pack, thus increasing its weight on sunny days (to a point, it will eventually get lighter as water falls off the roof). This is not prevented by increasing insulation. Metal absorbs and radiates sunlight very well. It only requires a small amount of metal to be exposed and it expands from there.
2. These can add an additional cost to the install. It may very well make it worth the additional cost if you are looking to protect a couple of specific areas. In order for a snow guard to be affective you need to prevent the snow from moving, this requires an install that matches the photo posted. If you only installed protection at the bottom or eave line, all the weight of that snow above rests on that one point and it could let go.
I would not consider covering my entire roof with these, as I think they are not overly attractive from a residential design standpoint. They do work though.
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