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Ratio

Max Rise In mm

Degrees of Slope - Values at the Yellow line

and to the right of the line are acceptable 

Max Rise in Inches

(DDA Table only includes value from 1 in 12 to 1 in 20)










1 in 12

166

4.7

3.2

2.4

1.9

1.6

1.4

1.2

1.1

1.0

0.9

0.8

0.7

0.7

0.6

0.6

0.6

0.5

0.5

0.5

6.5

1 in 13

231

6.6

4.4

3.3

2.6

2.2

1.9

1.7

1.5

1.3

1.2

1.1

1.0

0.9

0.9

0.8

0.8

0.7

0.7

0.7

9.1

1 in 14

286

8.1

5.4

4.1

3.3

2.7

2.3

2.0

1.8

1.6

1.5

1.4

1.3

1.2

1.1

1.0

1.0

0.9

0.9

0.8

11.3

1 in 15

333

9.5

6.3

4.8

3.8

3.2

2.7

2.4

2.1

1.9

1.7

1.6

1.5

1.4

1.3

1.2

1.1

1.1

1.0

1.0

13.1

1 in 16

375

10.6

7.1

5.4

4.3

3.6

3.1

2.7

2.4

2.1

2.0

1.8

1.7

1.5

1.4

1.3

1.3

1.2

1.1

1.1

14.8

1 in 17

412

11.6

7.8

5.9

4.7

3.9

3.4

2.9

2.6

2.4

2.1

2.0

1.8

1.7

1.6

1.5

1.4

1.3

1.2

1.2

16.2

1 in 18

444

12.5

8.4

6.3

5.1

4.2

3.6

3.2

2.8

2.5

2.3

2.1

2

1.8

1.7

1.6

1.5

1.4

1.3

1.3

17.5

1 in 19

474

13.3

9.0

6.8

5.4

4.5

3.9

3.4

3.0

2.7

2.5

2.3

2.1

1.9

1.8

1.7

1.6

1.5

1.4

1.4

18.7

1 in 20

500

14.0

9.5

7.1

5.7

4.8

4.1

3.6

3.2

2.9

2.6

2.4

2.2

2.0

1.9

1.8

1.7

1.6

1.5

1.4

19.7

1 in 21

524

14.7

9.9

7.5

6.0

5.0

4.3

3.7

3.3

3.0

2.7

2.5

2.3

2.1

2.0

1.9

1.8

1.7

1.6

1.5

20.6

1 in 22

545

15.2

10.3

7.8

6.2

5.2

4.5

3.9

3.5

3.1

2.8

2.6

2.4

2.2

2.1

2.0

1.8

1.7

1.6

1.6

21.5

1 in 23

565

15.8

10.7

8.0

6.4

5.4

4.6

4.0

3.6

3.2

2.9

2.7

2.5

2.3

2.2

2.0

1.9

1.8

1.7

1.6

22.2

1 in 24

583

16.3

11.0

8.3

6.7

5.5

4.8

4.2

3.7

3.3

3.0

2.8

2.6

2.4

2.2

2.1

2.0

1.9

1.8

1.7

23.0

1 in 25

600

16.7

11.3

8.5

6.8

5.7

4.9

4.3

3.8

3.4

3.1

2.9

2.6

2.5

2.3

2.1

2.0

1.9

1.8

1.7

23.6

1 in 26

615

17.1

11.6

8.7

7.0

5.9

5.0

4.4

3.9

3.5

3.2

2.9

2.7

2.5

2.3

2.2

2.1

2.0

1.9

1.8

24.2

1 in 27

630

17.5

11.9

9.0

7.2

6.0

5.1

4.5

4.0

3.6

3.3

3.0

2.8

2.6

2.4

2.3

2.1

2.0

1.9

1.8

24.8

1 in 28

643

17.8

12.1

9.1

7.3

6.1

5.2

4.6

4.1

3.7

3.3

3.1

2.8

2.6

2.5

2.3

2.2

2.0

1.9

1.8

25.3

1 in 29

655

18.1

12.3

9.3

7.5

6.2

5.3

4.7

4.2

3.7

3.4

3.1

2.9

2.7

2.5

2.3

2.2

2.1

2.0

1.9

25.8

1 in 30

667

18.4

12.5

9.5

7.6

6.3

5.4

4.8

4.2

3.8

3.5

3.2

2.9

2.7

2.5

2.4

2.2

2.1

2.0

1.9

26.2



2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20




Going of Slope in Metres


Pendulum Testing – Testing on Slopes


On a horizontal floor, the minimum PTV has been determined as ‘36’ and determined as the minimum Test Value necessary to ensure the HSE recommended minimum probability of slip is maintained at 1 in 1 million.  


However on a slope this slip probability gets worse so it is necessary to increase the PTV minimum test result in relation to the gradient (or angle) of the slope.



Reducing PTV Results for slopes

The UK Slip Resistance Group (UKSRG) Guidelines state


“The target PTV on a slope compared to a level walkway needs to be increased by: 100 x tan α (where α is the slope angle)”.


Simply put, this means for every 1 degree of slope, an increase in Pendulum Test Value is required to ensure the HSE recommended minimum probability of slip is maintained at 1 in 1 million.


The HSL has determined the minimum slip resistance should be increased by a value of 1.76 (PTV) for every 1 degree of slope; for ease and to be conservative (i.e. safer) use value of 2 PTV for every 1 degree of slope.


The following figures have been calculated for you as follows:-




 

















DDA Requirements The DDA (Disability Discrimination Act) dictates floor slopes should NOT be greater than an angle of 5 degrees, which relates to a maximum gradient value of 1 in 12.

Ramps For The Disabled

Link to Part M of the Building regulations 2004 - http://www.planningportal.gov.uk/buildingregulations/approveddocuments/partm/approved - Refer to Section 1.26


Using the table drawn below, you can determine the angle / or gradient quite simply - The first row of the table below shows a max of 4.7 degrees (Or approx. 5 degrees) at a gradient of 1 in 12.


Typical floor slope angle for a wheelchair

3 - 4 Degrees

(Also see info in the table below)

Values of Tangents and the relationship to Pendulum Test Values (PTV)


Slope Angle 

Calculations

New Minimum PTV Value Required

Exact

Nearest Whole Figure

1 degree

100 x Tangent of 1 degree (0.017455)  = 1.74

38

37.74

2 degrees

100 x Tangent of 2 degrees (0.034921) = 3.49

40

39.49

3 degrees

100 x Tangent of 3 degrees (0.052408) = 5.24

42

41.24

4 degrees

100 x Tangent of 4 degrees (0.069927) = 6.99

43

42.99

5 degrees

100 x Tangent of 5 degrees (0.087489) = 8.74

45

44.74