When to use 305mm HB kerb instead of a 255mm HB kerb

[davebrennan]

Hi, first post so go easy .

I have started a new position with a roads consultancy in NI and am currently reviewing the standard details amongst other things for a proposed 40mph link road project.

I noticed that the in house standard details showed a 305mm x 150mm HB road kerb to be used but i always used a 255mm x 125mm HB in my previous schemes with other companies.

I have asked around the office and no-one seems to know why there is the difference. I have also checked the relevant BSs but they do not give clarity either. I do not want to go back to the client and ask a possibly daft question nor do i want to over specify something - can anyone here offer some guidance?

 

[Debaser]

I have to say we always use the 255mm high half-battered kerb (on the mainland), giving a 125mm (6") upstand. I believe this is traditionally to allow a 25mm surface dress at some point in the future, thereby reducing the upstand to a minimum allowable 100mm (4") for non-mountable kerbs.

However, I have seen a document which states that the larger section is preferred in heavily trafficked areas, eg urban streets, or where there is kerbside parking by heavy vehicles.

 

[Debaser]

Sorry. Should have said that comment comes from a document called 'A guide to good practice for road edge details' by the Concrete Society (Concrete Society Technical Report No. 10).