521 CMR 24.2 - SLOPE AND RISE
Ramps shall have the least possible slope.
24.2.1 The least possible slope should be used for any ramp. The maximum slope of a ramp shall be 1:12 (8.3%). (There is no tolerance allowed on slope, Refer to 521 CMR 2.4.4d)
24.2.2 The maximum rise for any run shall be 30 inches (30" = 762mm). See
Fig. 24a.
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Exceptions: A slope between 1:10 (10%) and 1:12 (8.3%) is allowed for a single rise of a maximum three inches (3" = 76mm).
Notes
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