National ramp ALUMINUM SOLID, Installation Manual

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[ 30 ] NATIONAL RAMP
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2
'
3
'
4
'
5
'
6
'
7
'
8
'
9
'
10
'
3"
7.2
˚
4.8
˚
3.6
˚
2.9
˚
2.4
˚
2.0
˚
1.8
˚
1.6
˚
1.4
˚
4"
9.6
˚
6.4
˚
4.8
˚
3.8
˚
3.2
˚
2.7
˚
2.4
˚
2.1
˚
1.9
˚
5" 12
˚
8.0
˚
6.0
˚
4.8
˚
4.0
˚
3.7
˚
3.0
˚
2.7
˚
2.4
˚
6"
14.5
˚
9.6
˚
7.2
˚
5.7
˚
4.8
˚
4.1
˚
3.6
˚
3.2
˚
2.9
˚
7"
11.2
˚
8.4
˚
6.7
˚
5.6
˚
4.8
˚
4.2
˚
3.7
˚
3.3
˚
8" 12.8
˚
9.5
˚
7.7
˚
5.4
˚
5.5
˚
4.8
˚
4.2
˚
3.8
˚
9"
14.5
˚
10.8
˚
8.6
˚
7.2
˚
6.2
˚
5.4
˚
4.8
˚
4.3
˚
10" 12.0
˚
9.6
˚
8.0
˚
6.8
˚
6.0
˚
5.3
˚
4.8
˚
12" 14.5
˚
11.5
˚
9.6
˚
8.2
˚
7.2
˚
6.4
˚
5.7
˚
14"
13.5
˚
11.2
˚
9.6
˚
8.5
˚
7.4
˚
6.7
˚
16" 12.8
˚
11.0
˚
9.6
˚
8.5
˚
7.7
˚
18" 14.5
˚
12.4
˚
10.8
˚
9.6
˚
8.6
˚
20"
13.8
˚
12.0
˚
10.7
˚
9.6
˚
22" 13.2
˚
11.8
˚
10.6
˚
24"
14.5
˚
12.8
˚
11.5
˚
26"
13.9
˚
12.5
˚
28" 15.0
˚
13.5
˚
30"
14.5
˚
INCLINE CHART
ADA-compliant ramps have a ratio of incline of
4.8°/1:12
slope. For residential use only, National
Ramp recommends no greater than a
6.4°/1:8
slope, and only for users in a power wheelchair or
manual wheelchair being pushed up the ramp by a caretaker. Some mobility devices may have a
higher maximum allowable slope; however, strong consideration should be given to any inclines
steeper than
6.4°/1:8
. Refer to the mobility device’s Owner Guide to confirm its maximum allowable
slope.
Inclines in gray on the chart below are safe for use based on the mobility device.
National Ramp strongly advises against any slopes in red.
9. Correct Incline Determination
* This chart is provided as a resource only and National Ramp assumes no responsibility for
determining a safe ramp incline on any specific ramp.