Statics
Basic:

EN 1995-1-1 : 2008 / 09 (Eurocode 5)
DIN 1052 : 2008-12
SIA 263/1 : 2009 + 265/1 : 200

Wood gradings / qualities, according to:

EN 338, EN 1194
DIN 1052 : 2008-12
SIA 265/1

HW + HS : Isonorm
(HW=HM, TCT / HS=HSS)

 
 

  

LS
Step lengthHardwood D30
EN 338
 
 
mmmm
900 36* - 40
100040* - 44
110040* - 44
120042* - 46
 
mmmm
900 36* - 40
100040* - 44
110040* - 44
120042* - 46
 

mmmm
900 36* - 40
100040* - 44
110040* - 44
120042* - 46

 
 * Static requirement, in case of inferior dimensions, change steps.

   

Indoor stairs

Pedestals stairs: In general, suitable for all buildings.

Straight stairs: By apartment buildings; consider half-pace.

Helical stairs: Mostly in one-family houses.

Spiral stairs: Unapt for main stairs.

Steep stairs: Alternately step, limited admission, alley ≥ 500 - 700mm, handrails on both sides.  

Safety: Opening ≤ Ø 120mm.

Half-pace: After 18 steps at least.

Raising proportion: 2 x ↑ + 1 x ↔ = ~ 620 - 630mm (walk line area).

Walk line: From the interior; spiral stairs from the exterior.

Step depth: At the walk line ~ 250 - 290mm. At the inner well side string ~ 120mm.

Passage width: In one-family houses ≥ 800mm, in apartment buildings ≥ 1100mm.

Wall distance: Steps and half-paces ≤ 50mm, handrails ≥ 50mm.

Balustrade height: For stairs and balustrades ≥ 1000mm.

Handrails: Step-leading edge - handrail-upper edge ↑ 800 - 900mm. Ø 40 - 50mm.