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What does a winter support bar do, and can I leave the snow on the roof?

A winter support bar stands under the roof and helps it carry the weight of heavy snow, which reduces the stress on the roof and on the frame through the winter. It is a support, not a substitute for maintenance: a support bar helps, but clearing heavy snow off the roof is still recommended. The post adjusts in length, so it can be set to the height under your own roof beam, and it is easy to remove in the spring.