STAIR CASE ANATOMY

Here are some stair­case terms and the rec­om­mended guide­lines for a stair­case de­sign that is er­gonomic and safe.

Home & Decor (Malaysia) - - Feature -

1 RISE

This is the to­tal height of the stairs, de­ter­mined by the sum of the ris­ers’ height and num­ber of steps.

2 RUN

The to­tal di­men­sion of the treads. The run and gra­di­ent of the stairs are re­lated – for a gen­tler as­cent (deeper treads and lower ris­ers), you will need a longer run.

3 TREAD

The stair treads are where you step on while climb­ing the stairs. The ideal depth of each tread should be at least 25cm.

4 RISER

All ris­ers should be the same height. Vary­ing heights break the rhythm as cal­cu­lated by the brain, which can lead to tripping. The ideal height should be no more than 18cm.

5 STRINGER

The hous­ing on the sides of a flight of stairs. A stair­case can have two stringers (on ei­ther side), or just one (in the mid­dle as a sup­port­ing beam, or on the out­side).

6 RAIL­ING

This is a prac­ti­cal fea­ture, nec­es­sary for heights from 1m, as it pre­vents fall­ing off an open side. It can be de­signed in nu­mer­ous ways. For ex­am­ple, it can be com­posed of balus­ters and a handrail made of wood, or glass pan­els. The ideal handrail height is be­tween 75cm and 95cm. For com­fort­able grip­ping, the ideal width of a handrail is be­tween 3cm and 6.5cm.

7 NOS­ING

The nos­ing is the edge fin­ish­ing of the treads that makes the stairs more com­fort­able to climb. How­ever, it mustn’t over­hang too much, lest it be­comes a tripping haz­ard. The ideal range is 0.6cm to 2cm.

8 LAND­ING

A flight of stairs should not have a rise with a height of over 3.6m be­tween land­ings or floor lev­els. (That equates to around a max­i­mum of 20 ris­ers.) Land­ings pro­vide a tran­si­tion be­tween flights of stairs, and should have a min­i­mum depth of 90cm.

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