First ask how heavy the roof washer should be

Damage to roof is easy to prevent
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First ask how heavy the roof washer should be

A grower is likely to have a problem if a slightly too heavy roof washer or chalking machine is driven over a greenhouse roof that is slightly too weak. The damage from distorted gutters is not immediately visible but it will become apparent during a storm or heavy snowfall. Then the question is what caused it? But you really don’t want to end up in such a discussion.

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