National ramp ALUMINUM SOLID, Installation Manual, Page: 34 / 138

[ 34 ] NATIONAL RAMP
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12. Measuring a Ramp
1.
Measure door width and analyze door swing.
2.
Measure the height of the step at the door – anything greater than 3" should have a platform.
Absolute minimum elevation for a platform is 2.5", but only if the stoop is perfectly level.
3.
Measure overall step height.
MEASUREMENTS NEEDED:
A
Door Width
B
Rise at Door: Exterior or Interior
C Porch Width
D
Porch Depth
E
Rise at Porch
F
Width of Steps
G
Rise of Steps (Total)
H
Depth of Steps (Total)
I
Sidewalk Width
J Door to Corner of Porch
K
Porch to Corner of House
L
Porch to Driveway
M
House to Sidewalk
N
Porch to Sidewalk
Complete and accurate measurements will make sure your ramp layout works on the property.