![]() ![]() Depending on where you’re putting the stair, your well opening size may be determined for you. We call this hole in the floor a ‘well opening’. If you’re installing a stair through a hole in the floor, making sure you have the right size opening for your new spiral stair is key. If your project includes a hole in the floor (likely a round hole for the round stairs) that calls for a spiral stair you will want to pay close attention to our well opening size dimensions. ![]() The best ways to find the right size for you is to find your footprint measurement in the chart above and call us to speak to one of our designers for an expert consultation. Since a spiral stair is a purely vertical structure, you can think of it like a cylinder or tube going up and down. Diameter isn’t a necessary measurement to have when you call your designer, but it can help you to determine the right size for your space. In order to determine how much space a 5″ diameter stair will take up you can simply use duct tape to mark the space off on the floor. A five foot diameter stair has a footprint of 60″ x 60″. You can also think of diameter as the footprint of the stair, or in other words, the space that your stair takes up. Standard diameters increase in six inch increments, 42″ x 42″ to 48″ x 48″ to 54″ x 54″ and so forth. The smallest size diameter we offer is 3 feet 6 inches (42″ X 42″). Our designers can help you determine the best size stair for your space. Walls may limit the diameter of your stair. The simplest definition of your diameter is the width of your stair, as spiral stairs are round stairs. No matter where your stair is going, you will need to keep stair diameter in mind. A full 360 degree rotation means that you will exit the same at the same angle you entered onto the stair. Using the table below you will notice that 9 treads gets you 270 degrees of rotation (9 treads x 30 degrees = 270 degrees of rotation). In other words, each tread represents a 30 degree turn. Most, but not all of our stairs use 30 degree treads. Please refer to the table above for a reference on how to calculate the rotation of your staircase. ![]() The specification that determines the rotation of your spiral stair is floor to floor height. As a custom shop, we can build your stair to your specification, so standard stair dimensions don’t have to be so standard. Each Salter Spiral Stair is unique all the way down to its rotation. ![]() When you think of spiral stairs, you might imagine round stairs with a beautiful 360 degree spiral that has a whimsical winding shape. Be sure to account for any concrete, underlayment, subfloor, carpeting, or tile in your measurement. If you are installing a stair through a hole in the floor, you can simply measure from the bottom floor to the top of the opening. Generally, our stairs are installed in two ways: coming off a deck, loft, building, etcetera or the stairs are installed through a hole in a floor. For example, if you are installing a stair on a deck, your floor to floor measurement would be the length between ground level and the finished deck flooring. So you need to measure through the ceiling, through any subflooring, and through any flooring to get the correct measurement for sizing your stair. But you need to go above the ceiling to the top of the next floor. Floor to ceiling is the length between the top of your floor and the ceiling. The most common mistakes people make in determining their stair size in terms of height is that they measure floor to ceiling height instead of floor to floor height, which is what they really need. The distance between the two floors you’ll want to connect is set. Of the standard stair dimensions, the most important measurement when planning your spiral stair design is going to be your floor to floor height. ![]()
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