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UK Specialists in H&S Approved Floor Pendulum Testing for Businesses and Expert Witness Services for Slip Injury Lawyers

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Floor Testing – Testing on Slopes

 

It stands to reason that the steeper the slope, then the more likely you are to slip on that slope, yet 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 (SRV) also know as the Pendulum Test Value (PTV). On a horizontal floor the HSE expects a Pendulum Test Value of 36 PTV on a WET or CONTAMINATED  floor but for every 1 degree of slope the PTV value must increase by a approximately 2 PTV (1.75 PTV to be more precise).


*The value of 36 PTV has been determined by the UK Health and Safety Executive / UK Health and Safety Laboratories as the minimum Floor Test Value necessary to ensure when a Floor is WET or CONTAMINATED (which is far worse than any DRY floor) that the probability of slip is maintained at a minimum 1 in 1 million termed by the HSE as a ‘Low Probability of Slip’.

Example - Pendulum Test Value on a Slope of 5 Degrees

If the slope was 5 degrees then an additional value of 9 PTV is required (5 x 1.75 PTV) on top of the 36 PTV making 45 PTV. When Floor Testing, FloorSlip accurately measure the floor with a digital inclinometer and adjust the readings accordingly   







Source of Information in respect to reducing PTV Results for slopes

Guidelines created by the UK Slip Resistance Group (UKSRG) who are a main advisory body to the UK HSE, the UK Government and instrumental in the British Standards 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)” which simply put 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 following figures have been calculated for you as follows:-




 











Regulations for Ramps For The Disabled in the UK

There are various acts for the rights of Disabled Citizens to be considered in respect to floor safety and particularly in respect to the subject of floor slopes. The data for wheelchair users is covered in Part M of the UK Building regulations which gives clear details on slope angles (and other useful data) and the Equality Act for England, Scotland and Wales 2010; formerly known as the DDA Requirements or Disability Discrimination Act. Note 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. Read more about Floor Safety in Care Homes








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 of 3-4 degrees - max 5 degrees


Values of Tangents and the Relationship to Pendulum Floor Testing Values

Slope Angle 

Exact Calculations

Rounded Figures

(for ease of remembering)

New Minimum PTV Value Required

(To Nearest Whole Figure)

Exact

1 degree

100 x Tangent of 1 degree (0.0174550) =

1.75 PTV

38

(37.75)

2 degrees

100 x Tangent of 2 degrees (0.034921) =

3.50 PTV

40

(39.50)

3 degrees

100 x Tangent of 3 degrees (0.052408) =

5.25 PTV

42

(41.25)

4 degrees

100 x Tangent of 4 degrees (0.069927) =

7.00 PTV

43

(43.00)

5 degrees

100 x Tangent of 5 degrees (0.087489) =

8.75 PTV

45

(44.75)

floor slope angle adjustment