Stair Stringers

Silvio · Nov 12, 2020

Hey All,

Does anyone know of a general rule of thumb for determining what length lumber to use for stringers based on overall rise? For example, if I have a set of stairs that rise 10', can I purchase a 2X12X12 and have enough length for a stringer? I don't do enough framing for it to be second nature and haven't found anything online. I hate to waster lumber, especially given current costs.

Thanks,
Silvio

We Fix Houses · Nov 12, 2020

12 ft 2x12 won't be long enough. There are many stair calculators online. For what you say 7.5" rise takes a 15'-8" stringer.

Hopefully you can get 20ft 2x12 --- they are heavy...heavy..btw.

If inside, LVL's are sometimes the better choice. Me, I would have to look up if single or double for each stringer is the way to go.

Addl - https://lpcorp.com/media/2990/lp-solidstart-lsl-and-lvl-stair-stringer-tech-guide-english.pdf

Treated LVL / Gluelam

Pressure-Treated LVL

For above-ground interior or exterior use, such as deck beams, joists, columns, and treated sill plates.

www.jlconline.com

Warren · Nov 12, 2020

Roughly, I figure about 1 ft per rise, then round up.

Calidecks · Nov 12, 2020

You can use the pythagorean theorem (sp) to get yourself there.

Mike.
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[emoji631] [emoji631]

Tinstaafl · Nov 12, 2020

Yep, pythagorean theorem. Simple.

Don't forget that code limits the length of an uninterrupted run.

VinylHanger · Nov 12, 2020

But an app is so much easier.

This is the calculator I use. I use it for all sorts of things. The baluster calculator is awesome. Saves a ton of time.

Stair Calculator with Detailed Plan Diagrams - Inch

Calculate stair rise, run, stringers, head-room and upper floor opening dimensions - Wood and concrete stairs - Inch

www.blocklayer.com

Sent from my SM-N975U using Tapatalk

Ed Corrigan · Nov 13, 2020

Do the math. Exercise the brain along with the muscles.

Big Johnson · Nov 13, 2020

14’er for 8’ (9’+ rise) basement and 16’er for 9’ (10’+ rise) basement but I always just get 16’ers.

Silvio · Nov 13, 2020

Thanks all! I had a brain fart and thought of the Pythagorean Theorem after the fact.

Stair Stringers

Pressure-Treated LVL

Stair Calculator with Detailed Plan Diagrams - Inch

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