Guidance for Designing

Spiral staircase

We are at your service for guidance and advice when planning projects including Weland spiral staircases.

On ordering, each spiral staircase is drawn up specially and the drawing is sent to the customer for approval prior to manufacturing.



Staircase Radius

The staircase radius is the measurement from the centre of the staircase to the outer edge of the handrail. Weland manufactures spiral staircases with a radius of 600 to 1500 mm.



Rise

The rise should be chosen based on the given height between the landings. A suitable radius and the number of steps per revolution then determine the step rise.

The rise should be sized between 160 and 220 mm. The lower the rise you choose, the deeper the step needs to be. The normal rise is about 170 to 180 mm.

The formula for the rise is 2 x h + W = 580-640.



Right or left turning staircase

Weland spiral staircases are manufactured with right or left turning. Right turning means turning to the right from the entrance point. (the centre tube to the right of upward travel).

Right turning

Right turning staircase

Left turning

Left turning staircase



Headroom

The headroom on the stairs must not be less than 2000 mm. The height is measured between two points located directly below each other.

Measure from the top edge of the lower step’s nose to the lower edge of the level’s (step) rear edge.



Number of steps per revolution

The figures to the right are a guide when determining the number of steps per revolution and the number rises. Count the number of rises between the landings and compare the values for the obtained rise.

Fields marked (green) in the table are the staircase dimensions that should be aimed for during the planning stage.

Radius steps/rev. Going on walking line* Suitable rise

600/14

600/15
600/16

157

147
137

200-220

200-220
200-220

700/15

700/16
700/17
700/18

188

177
166
157

200-220

200-220
200-220
200-220

800/16

800/17
800/18
800/19
800/20

216

203
192
182
173

180-210

180-210
190-220
190-220
190-220

900/16

900/17
900/18
900/19
900/20
900/21

255

240
227
215
204
194

175-200

175-200
175-200
180-210
180-210
180-210

1000/16
1000/17

1000/18

1000/19
1000/20
1000/21
1000/22
1000/23

294
277

262

248
236
224
214
205

165-185
165-185

165-185

175-200
175-200
180-210
180-210
180-210

1100/18

1100/19
1100/20
1100/21
1100/22
1100/23
1100/24

297

281
267
254
243
232
222

165-180

165-180
165-190
170-200
170-200
170-200
170-200

1200/17
1200/18
1200/19

1200/20

1200/21
1200/22
1200/23
1200/24

351
331
314

298

284
271
259
249

155-190
155-190
155-190

155-190

155-190
160-200
170-200
170-200

1300/18
1300/19
1300/20
1300/21

1300/22

1300/23
1300/24

366
347
330
314

300

287
275

155-180
155-180
155-180
155-180

155-190

155-190
155-190

1400/20
1400/21
1400/22
1400/23

1400/24

1400/25
1400/26

361
344
328
314

301

289
278

150-180
150-180
155-190
155-190

155-190

155-190
155-190

1500/22
1500/23

1500/24

1500/25
1500/26
1500/27
1500/28

357
341

327

314
302
291
280

150-180
150-180

150-180

155-180
155-180
155-180
155-180

 

= Staircase dimensions that should be aimed for.

The going* The going is calculated to be on an imaginary walking line 250 mm from the circumference.



Child Safety

By child safety we mean that up to 800 mm railing height no opening within the staircase is allowed to be larger than 100 mm.



Handrail

As standard handrails are made of stainless steel tube, Ø 42 mm.



Railing Height

The railing height is 1100 mm from the front edge of the tread. Extra handrails are placed at an option height inside the balusters, for example, 900 mm. The railing height of the landing is 1100 mm as standard.



Railing Loading

The railing is designed to withstand a load of 1.0 kN/m of handrail.



Stairtread Loading

The treads are designed for a distributed load of 5.0 kN/m2 or a spot load of 5.0 kN.



Clearance to Wall

The spiral staircase circumference must be at least 50 mm from the wall. The going is calculated to be on an imaginary walking line 250 mm from the circumference.



Stays

The spiral staircase must be fitted with stays every revolution (2.5 to 3 metres in height). This can be done using the square landing fixing. If the stairs have no square landing on each revolution, bracing must be fitted between the step and wall using custom stays.

Stays, vertical

When the spiral staircase cannot be braced to an adjacent wall, it needs to be stabilised using a vertical stay. These are attached at the bottom against the completed floor or foundation.



Landing Fixings

Use suitable type of bolt considering the material at the fixing points.



Baseplate Fixing

Use suitable type of anchor considering the material at the fixing point.

A base must be cast to fasten spiral staircases when there is no existing platform. Wind strengths, etc. must be taken into consideration when designing this.

Generally, the distance to the base plate from the wall must be at least the stair’s radius plus 50 mm.


Product Manual

Brochures

 

Spiral Staircases and Straight Staircases

Spiral Staircases and Straight Staircases for all Environments - Outdoors and Indoors

Date:
29/06/2016
Pages:
20
Keywords:
Spiral Staircases; Straight Staircases; all environments; outdoors; indoors; evacuation; availability; Industrial environments; office and home applications; Custom-Designed; Weland AB
File type:
pdf

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