Diameters
The available diameters vary from model to model but 1600mm is the overall maximum for any spiral. Kit spiral staircases are not large enough to be used as a primary stair but are suitable, in certain diameters, to meet regulations as secondary domestic stairs.
Materials
The centre column barrels are formed with steel cylinders on all the kit spiral staircases and are powder coated various colours. The treads are either beech or pressed steel plate. Due to the adjustable nature of the product, the handrail is supplied in PVC or on some models timber . Materials vary on each model.
Floor to Floor Heights
The beauty of these kit systems is that the height of each step is adjustable. The standard 13 riser kit for example will suffice for 90% of floor to floor heights. The variations in height adjustments varies between models but additional steps are available should your floor to floor height be greater than the maximum the standard kit can achieve.
Accessories
The most popular additional items that customers are matching landing balustrade to run around the opening upstairs and riser bars. Riser bars reduce the space between the treads to ensure a gap of less than 100mm. This is a regulation for domestic stairs in the UK.