Stair Stringer Throat Thickness

How strong should the stringers be and what are the load bearing requirements of stairs and their.
Stair stringer throat thickness. Usually 15 17 cm optimal width of a step 27 30 cm. Stair stringer notching template. This article describes the construction and building code specifications for the support of residential stairways. Might get shot for this but as i recall from wood framing days throat depth.
For concrete stairs select concrete thickness and enter the throat thickness see diagram and stair width to calculate formwork dimensions and concrete volume. Codes strength requirements for stair support systems. Otherwise it is left to the builder s common sense experience and available rules of thumb to prevent the stringers for a 10 foot flight of stairs to be constructed from two 2x8s. How to build safe stair stringers that don t sag squeak collapse or lose their treads.
3 for 9 stringer 5 for 11 stringer 8 for 14 stringer. The only guidance provided to a builder for the structural capability minimum throat depth of wood framed stair stringers comes from a carpentry handbook. Timberstrand lsl stair stringers and sturdistep stair treads specifier s guide 9010 ember 2015sept 2 1 1 3e timberstrand lsl sairt stringers suggested residential stringer attachment details 40 psf live load and 12 psf dead load high end 1 minimum throat depths may be reduced by an additional for 117 8 and 14 material depths if 2x4 reinforcement is. S and standard value in a private house taking 90 110 cm if space is limited a width of the opening sause the minimum critical value 80 cm.
The height and width of the steps. The width of the opening of the stairs. According to standards the maximum height of stairs may not exceed 200 mm. Running measurements vertically lower floor to top of each tread.
If you plugged in the run 4 you would end up with 6 risers.