(Warning: the traditional center line baluster placment will require newel posts to be notched. The following are spacing instructions for Traditional Center Line Baluster Placement. This allows for a little more space on the stairs however, you should still check with your local building inspection department to determine what their exact requirements are. There are two exceptions to this, one of which states that guards on the open side of a stair (on the rake) shall not have openings which allow the passage of a sphere 4-3/8 inches in diameter. What it means in plain english is that the balusters have to be close enough to each other to prevent a 4" ball from being passed through the railing. (Note: this is often referred to as the 4 inch rule).
Required guards (railings) shall not have openings from the walking surface to the required guard height which allow passage of a sphere 4 inches in diameter. The International Residence Code (IRC) 2009 R312.3 states the following: This will let you know how close the balusters need to be to each other. Before installing any railing system, homeowners, installers and/or architects should contact their local building inspection department to determine what is required. The first step in determining your baluster spacing is to find out what the building code requires in your area. Determine Local Building Code RequirementsĬorrect baluster spacing on stairways and balconies is important for both creating a beautiful staircase and providing a safe staircase that complies with current building codes.
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