![]() Photo: we see the addition of an intermediate support below a long stair stringer. on the stairway or on a stair tread) or to support a loading of 100 pounds per square foot, or for residential buildings 40 psf for 1 and two-family dwellings. ![]() Modern building codes do not provide explicit design load-specifications for stair stringers and treads and their connections, leaving those to design professionals such as architects and engineers, but the model codes do require the stairs to support a concentrated live load of at least 300 pounds (e.g. Stair Stringer Codes & Specifications: required strength for stair supports We also provide an ARTICLE INDEX for this topic, or you can try the page top or bottom SEARCH BOX as a quick way to find information you need. This article describes the construction and building code specifications for the support of residential stairways: how strong should the stringers be, and what are the load bearing requirements of stairs and their supporting stringer beams. How should stair support stringers be constructed and connected, what alternative materials can be used & what are the stair stringer building code specifications for strength & load bearing requirements.Ĭodes & strength requirements for stair support systems how to build safe stair stringers that don't sag, squeak, collapse, or lose their treads. We have no relationship with advertisers, products, or services discussed at this website. InspectAPedia tolerates no conflicts of interest.
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