Upward roof length for leeward drift?

[AnimusVox]

I've got a question I'd like some of your input on.

When it comes to choosing the length of the upward roof to determine leeward snow onto a canopy, is there a maximum angle to the left or right (shown as Θ in the picture) that you would consider?

I'm designing the attachment of a canopy.

Thanks

 

[JAE]

We use 90 degrees (perp. to canopy wall)

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[ajh1]

US rules are generally perpendicular to the canopy wall as JAE noted. Canadian rules look at both dimensions of the upper roof and calculate an adjusted length as a result. Not sure there is an angle result directly related to that. Be sure to include not just the immediate upper surface but potentially some impact from additional upper surfaces beyond the immediate one.

 

[jayrod12]

The Canadian code accounts for both dimensions, but only to determine the amount of snow available on the upper roof. It doesn't care which side of the roof you're checking the buildup.

 

[DaveAtkins]

I agree, use 90 degrees. Canopy loads can already be RIDICULOUSLY large, don't make it worse by assuming what you are suggesting.

DaveAtkins