Thank you for your purchase of our Econo Plus Spiral Stair! This easy to use calculator will help you determine how many tread spacers you need to install to achieve your application's floor to floor height.
With two simple steps, this sheet wil calculate your riser height and the spacer quantity required for your bottom tread and main treads.
If at any point you need assistance, please call our customer service line and they will answer any questions you have.