Hi Keith - hope this helps
We would always recommend where possible to get a 30 LRV points difference. Although this is not always possible when putting together finishes (depending on what finishes are available and what also creates an attractive environment). If you cannot get 30 LRV points difference then as close to 30 as possible, with 20 being the mininum. Additionally surface finishes should be planned in conjunction with existing or proposed lighting plans.
For larger surfaces such as walls, floors, ceilings and doors - as above try and achieve 30 LRV points difference, but depending on the LRV of the ceiling be aware that sometimes a 30 LRV difference between ceilings and walls can create an environment dark and uninviting environment. If there is a good, even spread of light with good lux levels for an area; differences of 20-30 LRV points between larger surfaces are more acceptable. However as lighting levels can change over time due to lights failing, needing cleaning and loosing output, getting to as close to 30 LRV points difference is the best option.
However to add another dimension .... as you go down the LRV table towards 50 LRV and below, this can affect the ability of surfaces to reflect light and surfaces of 50 LRV below will absorb more light than they reflect light. Depending on the size and shape of an area and the amount of natural and artificial light in an area this could make an area feel dark and uninviting and therefore the lighting plan would have to account for walls that absorb light. Therefore in some cases it will be better to have a lighter area and achieve a 20-30 LRV points difference than achieve a 30 LRV points difference. If you try and choose a ceiling with a really high LRV - dulux have a ceiling that is 92 and crown have a paint that is 90; then it gives you more scope to keep the walls as light as possible.
Colors with LRV higher than 50% will be lighter and will reflect more light back into the room than is absorbed.
Skirtings - skirtings deeper than 100 mm should be decorated the same colour or the same LRV as the wall. Skirtings less than 100 mm can be decorated the to match the wall or the floor or as is more usual white in colour (Bright and Cook, 2010, p. 133-136). For further advice on skirtings please see Bright and Cook The Colour, Light and Contrast Manual 2010
In the case of handrails as they are key safety feature we would always advise 30 LRV points differences.
Kind regards
Antonia John
Senior Housing and Access Consultant, RNIB Cymru (Royal National Institute of Blind People)
Ffôn/telephone: 01792 325316
Symudol/mobile: 07810815937
"Working towards accessibility for all within Housing and the Built Environment for present and future generations".
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-----Original Message-----
From: Accessibuilt list [mailto:[log in to unmask]] On Behalf Of Keith Oakes
Sent: 25 January 2013 11:40
To: [log in to unmask]
Subject: Re: Revised Building Regulations ADM/ADK
Hi Antonia
Many thanks for your advice
What difference in LRV would you suggest for handrails and skirtings?
Larger surfaces such as floor to wall - 20 or 30 points difference?
Thank you
Kind regards
Keith Oakes
Technical Director
Gradus Ltd
Park Green
Macclesfield
Cheshire
SK117LZ
Tel 01625 428922
Fax 01625 425226
Mobile 07768 210297
From: "John, Antonia" <[log in to unmask]>
To: [log in to unmask],
Date: 22/01/2013 15:01
Subject: Re: Revised Building Regulations ADM/ADK
Sent by: Accessibuilt list <[log in to unmask]>
________________________________
Hi Keith
The advice from the RNIB would be to always use a 30 or more LRV points difference to ensure that stair nosing's contrast. This is because lux levels can vary if light bulbs fail, are not switched on, loose output over time or are not cleaned regularly. Therefore having a 30 LRV points difference will help ensure that key features of an area such as stair nosing's will contrast in varied light conditions.
Kind regards
Antonia John
Senior Housing and Access Consultant, RNIB Cymru (Royal National Institute of Blind People)
Ffôn/telephone: 01792 325316
Symudol/mobile: 07810815937
"Working towards accessibility for all within Housing and the Built Environment for present and future generations".
Disability Action Centre, The Courtyard, D'Arcy Business Park, Neath SA10 6EJ
[log in to unmask]
www.rnib.org.uk/cymru / www.rnib.org.uk
www.facebook.com/RNIB.Cymru / www.facebook.com/rnibuk
www.twitter.com/rnibcymru / www.twitter.com/rnib
-----Original Message-----
From: Accessibuilt list [mailto:[log in to unmask] <mailto:[log in to unmask]> ] On Behalf Of Keith Oakes
Sent: 17 January 2013 12:55
To: [log in to unmask]
Subject: Revised Building Regulations ADM/ADK
Revised Approved Document M recommends all nosings made apparent by means of a permanently contrasting material 55mm wide on both tread and riser. Revised ADK recommends the same for buildings other than dwellings but then recommends different size nosings for common access areas in buildings that contain flats?
Can anybody explain why the difference?
ADM states: Contrast visually: "Where illuminance on surfaces is greater than 200 lux, a difference in light reflectance value should be a minimum of 20 points"
Is anybody aware of any research that backs this up?
Gradus as a leading manufacturer of stair nosings has always erred on the side of caution and insisted on a light reflectance value difference of 30 points for nosings on stairs.
I would welcome opinions please.
Thank you
Regards
Keith Oakes
Technical Director
Tel 01625 428922
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