No of risers between "landings"?

[TripleNut]

I'm looking at a small project where we'd like the floor to floor height to be around 2850 (38bk courses). However, Part K - 1.18 states.....

b. For flights between landings the maximum number of risers should be:...
(ii) general access stairs - 12 rises, but exceptionally no more than 16 in small premises where the plan is restricted.

My question is whether the word "landings" refers to half-landings as well as each floor? My assumption is that is must do, it's just that it's not that clear in the regs.

If this is the case, as I feel it must be, then sensibly you could have 12 risers from one floor up to the half landing then 12 from the half-landing to the next floor, totalling 24 risers between floors.

 

[^woody^]

A landing is still the same as a step.

 

[bernardgreen]

A landing is still the same as a step.

but can also be considered as a "safe resting place" that breaks the climb up or down into two sections. Useful when people get old and need a rest halfway.

 

[tony1851]

A half-landing does count; so 12 risers to 1/2 landing then 12 risers to next floor level would be OK.
Question is: why do you need 24 risers to go up only 2850?

 

[TripleNut]

A half-landing does count; so 12 risers to 1/2 landing then 12 risers to next floor level would be OK.
Question is: why do you need 24 risers to go up only 2850?

My 12 risers explanation was meant as a "you could do this is you wanted to". We'd be using 17 risers at ~167mm each, or possibly 18 at ~158mm each, whichever suite the plan and handrail arrangement best.

 

[Nakajo]

What about 15 at 190? Or 14 at 203?

 

[tony1851]

My 12 risers explanation was meant as a "you could do this is you wanted to". We'd be using 17 risers at ~167mm each, or possibly 18 at ~158mm each, whichever suite the plan and handrail arrangement best.

You could have a 1:200 ramp if "you wanted to", but surely 24 risers - and including a half landing - takes up an awful lot of space, assuming your treads
will be at least 220mm?

 

[TripleNut]

What about 15 at 190? Or 14 at 203?

Because UK Building Regulations states that for a general access stair that also has to be Part M (Disabled Access) compliant that 170mm is the max rise allowable with min 250mm going (tread depth).

 

[TripleNut]

You could have a 1:200 ramp if "you wanted to", but surely 24 risers - and including a half landing - takes up an awful lot of space, assuming your treads
will be at least 220mm?

No one in their right mind would use 24 risers between floors. My suggestion was a hypothetical one. As I mentioned we'll be using a total between floors of 17 or 18 (9 between landings). A 1:200 ramp wouldn't work too well between floors though ...

 

[Diver Fred]

I'm looking at a small project where we'd like the floor to floor height to be around 2850 (38bk courses). However, Part K

Part K is for "Buildings other than Dwellings"

So is your project not a house but an industrial premises (inc. ofices)? In which case you should be including 'landings' or mezzine floors.

 

[TripleNut]

Part K is for "Buildings other than Dwellings"

So is your project not a house but an industrial premises (inc. ofices)? In which case you should be including 'landings' or mezzine floors.

No, Part K applies to all buildings. It's other parts of the Regs that have different section for different building types, such as Part B. But the development is a block of flats. A 3 storey development. Part K's definition of a "general access stair" applies to the general circulation spaces within the block. A "private stair" definition applies to the stairs within in each apartment.

 

[tony1851]

If this is the case, as I feel it must be, then sensibly you could have 12 risers from one floor up to the half landing then 12 from the half-landing to the next floor, totalling 24 risers between floors.

@op:
Oh I'm so sorry - I must have been out of my mind when I incorrectly assumed you were thinking of having 24 risers between floors.

 

[TripleNut]

@op:
Oh I'm so sorry - I must have been out of my mind when I incorrectly assumed you were thinking of having 24 risers between floors.

Sorry, what?!? No offence intended. Not sure why you would be.

 

[lt8480]

The section you are referring to is para 1.18 (page 10) of Park K - this does not apply to private dwellings (it is "For buildings other than dwellings").

On a domestic stairs you can have up to 36 steps in straight line and comply.

 

[TripleNut]

The section you are referring to is para 1.18 (page 10) of Park K - this does not apply to private dwellings (it is "For buildings other than dwellings").

On a domestic stairs you can have up to 36 steps in straight line and comply.

Agreed, that's what I was saying. Part K (as a publication) applies to all buildings, but as you mentioned, there are sections within which refer to various building types. A block of flats/apartments is not classed as a dwelling, but the units within it are classed as dwellings. Therefore 1.18 refers to the circulation space within (and outside) the building (but not within the dwellings themselves) and which I needed clarification on.