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Floor Testing – Testing on Slopes

One of the biggest mistakes we see is a lack of understanding that a slope on a floor requires an increase in the Slip Resistance Value (also know as the Pendulum Test Value) by a factor of approx 2 PTV for every degree of slope (1.76PTV to be exact).


On a horizontal floor (0 degree slope) the minimum PTV (Pendulum Test Value) has been determined by the HSE as ‘36 PTV and determined as the minimum Floor Test Value necessary to ensure the HSE recommended minimum probability of slip is maintained at 1 in 1 million and a ‘Low Probability of Slip’. If for example, the slope was 5 degrees then an additional value of 9 PTV is required (5 x 1.76 PTV) on top of the 36 PTV. When Floor Testing, FloorSlip accurately measure the floor with a digital inclinometer and adjust the readings accordingly   


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:-




 










Equality Act 2010 - Applicable in England, Scotland and Wales

Formerly known as the DDA Requirements or Disability Discrimination Act, in 2010, the DDA was replaced with the Equality Act for England, Scotland and Wales. The DDA is still applicable in Northern Ireland.


The Equality Act / DDA 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 - UK Building Regulations

Part M of the UK Building regulations give clear details on slope angles (and other useful data)


Link to Part M of the Building regulations


Access to Dwellings  

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/540330/BR_PDF_AD_M1_2015_with_2016_amendments_V3.pdf


Access to Buildings other than Dwellings

https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/441786/BR_PDF_AD_M2_2015.pdf


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 approximately 5 degrees) at a gradient of 1 in 12.


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


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 Floor Testing Values

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