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Ramp With Curve

P

Phil B

SAWHORSE
Joined
Sep 15, 2018
Messages
223
Location
Florida
I have a ramp with a slight bend in it between landings. Max rise is 30", max running slope is 1:12, and cross slopes are under 2%. Please see sketch below, railings not shown. I believe this is compliant, agree?

1749802027437.png
 
Phil B said:
I have a ramp with a slight bend in it between landings. Max rise is 30", max running slope is 1:12, and cross slopes are under 2%. Please see sketch below, railings not shown. I believe this is compliant, agree?

View attachment 15815
Click to expand...
Looks good from here the code does not say the maximum run is 30ft, its that the maximum rise is 30-inches between landings, so a ramp at 1:16 will be longer than 30ft, the length does not matter.

If your ramp is straight and 1:12, then it would be a maximum of 30ft, a lesser slope will have the ramp longer between landings.
 
It meets ADA. Here in California we would have longer landings, but the slopes and the bend comply - - on paper.
As a practical matter, it is extremely difficult to construct a ramp at exactly 8.33%.
 
Yikes said:
It meets ADA. Here in California we would have longer landings, but the slopes and the bend comply - - on paper.
As a practical matter, it is extremely difficult to construct a ramp at exactly 8.33%.
Click to expand...
Thank you! I will give them some wiggle room on the slope.
 
Yikes said:
It meets ADA. Here in California we would have longer landings, but the slopes and the bend comply - - on paper.
As a practical matter, it is extremely difficult to construct a ramp at exactly 8.33%.
Click to expand...

Yes -- as another member has pointed out in other discussions, 1:12 is the maximum slope for a ramp. 1:12.1 (8.26%) is acceptable. 1:11.1 (8.40%) is not).

Owners and architects don't like to waste more space than necessary for circulation, so the natural tendency is to regard the 1:12 "maximum and of allowable range" as an absolute -- i.e. all ramps become 1:12 -- but it's not. Anything steeper than 1:20 is a ramp, so that's where the range begins, and 1:12 is where it ends.

It's not 1:12 plus-or-minus ____. 1:12 is the upper limit.
 
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