December 14, 2012

What Are The Building Regulations For Spiral Stairs?

There are a number of reasons why a homeowner may choose to install spiral stairs in their home – they may think that the aesthetic appeal of these stairs will greatly benefit their home, or they may have an overly small room that they need to squeeze the flight into. For whatever reason, it is important that your spiral steps are made according to the correct building regulations.

Whilst you will need to check both the local and state authorities for codes that are relevant to your project, you will probably find that their regulations regarding spiral stairs are fairly similar. Some of the codes that you will have to meet include:
  • The width of the tread (at and below the handrail) must be at least 26 inches wide.
  • Each tread must be at least 7.5 inches deep (measured a foot from the narrowest edge of the step) and must rise no higher than 9.5 inches from the tread below. 
  • The clear headroom (measured from the top of each step) must be at least 80 inches high.
For any areas that have not been specifically outlined in the code for spiral stairs they must comply with the regulations that have been outlined for standard steps. This includes the installation of a handrail on at least one side of the flight, a height between 34 and 38 inches high, and specifications of the handrail. This basic code will also include instructions on how the stairs are to be lit, ensuring safety when traversing between floors.

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