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Snow drift adjacent building

Snow drift adjacent building

Snow drift adjacent building

(OP)
we have a new building a story high than adjacent. Architect wants me to design a sloped roof in the shape of the drift on the existing roof to eliminate snow drift.
I have always believed this was not a real solution, but others have gotten away with it. I believe the drift still exists and sits on top of the new sloped section.

Does anybody know of a reference that would justify this approach?

I told him to get a snow melt system on the existing roof. (all same owner)

RE: Snow drift adjacent building

Shed roofs are built all the time to negate snow drift. You start it at the same elevation as the high roof, and then slope it down to match the drift slope.

In the NBCC snow melt systems are recommended to be ignored due to maintenance issues.

RE: Snow drift adjacent building

As jayrod said, "...start it at the same elevation as the high roof..."

Specifically, "to design a sloped roof in the shape of the drift" will not (necessarily) omit the drift.

The essential element is to omit the "hc" - clear height from low to high roof. See ASCE-7.

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