Stair calculations

[AgHntr10]

I want to build a set of stairs to replace a vertical rung ladder on a stand I have in place. Height to the porch is 11 feet, can someone tell me how to determine the stringer length?

[CabezaBlanca]

Google stair calculator

[Ohio Darin]

Standard riser height for stairs is 7" so 11 divided by 7" (.58) is 18.97. Round up so you'll have 19 risers. If you use 6" wide treads the base of stairs would be 9.5 ft away from stand (19 risers x 6"). From here you use the formula A squared plus B squared = C squared.

11 feet squared + 9.5 feet squared = stringer squared

To solve you want the square root of 11 feet squared + 9.5 feet squared

Stringer would be 14.53 or 14'-6 7/16 based on 6" wide treads. You can calculate if you want wider treads.

[AgHntr10]

Standard riser height for stairs is 7" so 11 divided by 7" (.58) is 18.97. Round up so you'll have 19 risers. If you use 6" wide treads the base of stairs would be 9.5 ft away from stand (19 risers x 6"). From here you use the formula A squared plus B squared = C squared.

11 feet squared + 9.5 feet squared = stringer squared

To solve you want the square root of 11 feet squared + 9.5 feet squared

Stringer would be 14.53 or 14'-6 7/16 based on 6" wide treads. You can calculate if you want wider treads.

Thanks!

[klooney]

I was always taught 7/11

As close as you can get to a 7” riser height, and an 11” tread...

Based on that and a handy stair calculator this is what I came up with




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[AgHntr10]

I think I will stick with 2x6 treads for this project since it is just a deer stand, not something we will be walking everyday.

Another question, I know 2x12"s are typically used for risers but finding a 2x12x16' or even a 2x10x16' treated isn't looking good. I guess I could go with non treated and just paint them if I have too but would rather use treated. Is a 2x8 big enough for stringer material using 6" treads?

Thinking 3 stringers, steps 24-30" wide and using a couple of 4x4 post to support the steps about half way between the stand and bottom of the ladder.

[sendit]

I think I will stick with 2x6 treads for this project since it is just a deer stand, not something we will be walking everyday.

Another question, I know 2x12"s are typically used for risers but finding a 2x12x16' or even a 2x10x16' treated isn't looking good. I guess I could go with non treated and just paint them if I have too but would rather use treated. Is a 2x8 big enough for stringer material using 6" treads?

Thinking 3 stringers, steps 24-30" wide and using a couple of 4x4 post to support the steps about half way between the stand and bottom of the ladder.

Do you weld at all? Something metal is going to outlast and be stronger in the end.

I have built stairs for some of my blinds using 6” C purlins. It fairly light weight for steel. Just another option. Here is a pic, it’s not very detailed but you get the idea. Invert the purlin for stringers Nd cut the purlins for treads. You will need to put friction strips on them for safety.

[CBHunter]

Standard riser height for stairs is 7" so 11 divided by 7" (.58) is 18.97. Round up so you'll have 19 risers. If you use 6" wide treads the base of stairs would be 9.5 ft away from stand (19 risers x 6"). From here you use the formula A squared plus B squared = C squared.

11 feet squared + 9.5 feet squared = stringer squared

To solve you want the square root of 11 feet squared + 9.5 feet squared

Stringer would be 14.53 or 14'-6 7/16 based on 6" wide treads. You can calculate if you want wider treads.

Dude went a pulled out Pythagorean's theorem on is. [emoji848]


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[Dale Moser]

I'd lay it out on the shop floor, mess it up, cut to fit on site, and have one step that was different from all the rest.

[Ohio Darin]

I agree with Sendit. Metal is the way to go if you weld at all. I use a ladder/stair hybrid. Round rungs with angle iron stingers but at a slope between a traditional stair and a vertical ladder.

If you stick to 24" wide the 2x8 would be cutting it close. You'll probably need sister another 2x8 to each stinger to stiffen it up. All depends on how much flex you can tolerate

[TexasBob]

I'd lay it out on the shop floor, mess it up, cut to fit on site, and have one step that was different from all the rest.

This but I’m a pro.... split the difference across the last 3 steps


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[curtintex]

I'd lay it out on the shop floor, mess it up, cut to fit on site, and have one step that was different from all the rest.

This is exactly how I'd do it.

[AgHntr10]

I'd lay it out on the shop floor, mess it up, cut to fit on site, and have one step that was different from all the rest.

Sounds like the stairs in my parents house that were an afterthought for an extra bedroom. I can still remember waking up to the sound of my dad rolling down the stairs after missing that short step 2nd from the top! It happened on more than one occasion.

[hunter68]

I'd lay it out on the shop floor, mess it up, cut to fit on site, and have one step that was different from all the rest.

Exactly how I did mine! Lol

[Rick]

we just made these. platform was 6', so we decided 8' was good for the uprights. Leaned them against the platform, cut an angle on top and bottom of uprights and just started screwing steps to them. Just eyeballed it and screwed the steps on. Actually making stringers was way more calculating and work than i wanted to do for a deer stand...lol