How is this possible with only two stringers? The adjustable brackets are ICC/ES tested and approved as joist hangers. The risers are made structural (2x8’s), attaching to the brackets and spanning across the stair like load bearing joists. This structurally superior system has been tested with breaking strains in excess of 1,200 lbs. per sq. ft. Once the risers and treads are attached, your stair is complete. The result will be a stair that is accurate, extremely strong and "you built that stair".
Other codes address "rail post support" safety. A rail post per code regulations is required to support a lateral load of 200 lbs. This is a poorly enforced area of the code and with many inspectors content with the bump test. If it doesn’t move too much when they bump it with their hip, the rail will pass inspection. Many rail posts are simply lagged or nailed to the rim joists and post which are mounted directly to the deck surface will simply not meet code. The tragedy is, there are systems available on the market that correctly address this problem. Simpson, USP and Deck-Loc have brackets which will meet code for rim joist attachment but there’s only one adjustable bracket system (discussed below) which will meet code for wood or composite stairs.
Why are stairs considered to be so difficult? Stairs must be built according to specific building codes and they require a high degree of accuracy to work correctly. With traditional stair construction, every cut is final and you better know what you’re doing or you get to start over again. Multiple stringers are required with literally dozens of precise, free hand cuts required to form the stair. Each stringer must then be attached in perfect alignment for the rise and treads to be secured accurately. This is a very cumbersome process, requiring a great degree of skill and patience.
It is also essential that you keep the stairs clear of obstacles that could obstruct your travel up and down the stairs It is easy to set something down on the stairs but this moment or two that you save can easily result in an accidental fall and injury. It is essential that you do not place objects on the stairs or use it as a storage area. While generally those who are younger are less likely to hurt themselves on the stairs many accidents among children are as a result of playing on the stairs The stairs should not be used as a jungle gym or as a play area. They are not meant to run up or slid down and while this might sound appealing to a young child, it can quickly end in tragedy. If you have small children than a safety gate should be used at the top and bottom of the stairs.
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