What do they do?

They increase the overall height of the C20 Plus spiral stair.

How do they work?

Extra treads are included in the assembly of the C20 Plus spiral stair to increase the total number of treads and risers in the stair. Ultimately extra treads increase the overall height of the stair and also change the entry/ exit points (because extra treads will increase the overall rotation).

Most people don't need to order extra treads because the standard C20 Plus spiral stair kit covers most floor to floor heights. However, if you have a particularly high floor to floor height you may need to buy some extra treads.

What do I need to order?

The number of extra treads you will need depends on your floor to floor height. The standard C20 Plus spiral stair kit comes with 11 treads and a landing platform. The landing platform overlaps the finished surface of the upper floor by a few millimetres. Eleven treads plus the extra step up to the landing makes a total of 12 risers. You can discard some treads or add extra treads depending on your particular needs. The table below details the number of risers needed in relation to the floor to floor height on site. Remember that you get 12 risers in the C20 Plus spiral stair kit as standard so the most extra treads you can use is four.

E.g. if your floor height is 2950mm you need to order the staircase, plus one additional tread kit.

Packaging Dimensions