Quote:
Originally Posted by red-beard
Dot, not to get too technical on you, but you are saying grade and degrees. These are not the same. Is it a 21 degree angle slope or a 21% grade slope?
To understand, a 45 degree angle is 100% grade slope, you are going up the same amount as forward.
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Yes, you must mean 21 percent. 21 degrees is equivalent to 38%, and it can't possibly be that steep. I mean, that would be ridiculously steep. It better not be that steep. If it is, you are SOL.
I design driveways, and 20% is the max allowed. I've seen 25%, and that's pretty darn steep. 25% requires grooves in the concrete for traction. 38%? Wow. Did I mention that's ridiculously steep? The steepest hill in San Francisco is Filbert Street, at 31.5%.
How long is the driveway? Can you measure the vertical change across the horizontal distance? Percent slope is vertical divided by horizontal.