How to Layout a Stair Stringer

from California University of Pennsylvania most people like the idea of building a deck but often the idea of making stairs to be very intimidating because letting off the stair stringer can be very challenging or at least they think it is what I'm going to do is show you how to lay out a stair stringer a simple fashion step-by-step process here we have a typical staircase right here pretty small what I'm gonna be focusing on today is making the stairs stringer which is the knotch board located underneath the supports both the riser right here and the tread board right here and with the stair stringer is is this notch board right here some important measurements that we need to find out include your rise in your run of each step and your total rise to where we want to get to up to the level we're trying to reach now that I am finished showing you what is needed let's go to the drawing board and calculate the following details we've discussed okay now I can start to visualize the exact measurements that we're going to need to know the layout of a stair stringer to start off I'm going to set scenario up for what kind of stairs from here we're gonna have to make it's going to be just for deck will say this is the ground and yours aren't deck right here we're sitting off a short distance from the top of the back onto the ground now for most cases you might need to know how far out you have to go there stairs but since we're just going out to the ground we don't even know that that's already taken care of for us it doesn't really matter in this case works so that being said we're gonna happen though the one measurement being the total rise which is right here and for this case I'm going to make the Toa rise 36 inches or 36 and 1/4 of an inch right there next thing you'd mean though is most Commercial Code requires a certain rise as certain run for each one of your steps generally your eyes should be between 7 inches and 7 3/4 and run is somewhere around 10 inches for this case we're just gonna go by 7 over 10 7 inches and rise over a 10 inch run to start off with with that we're going to take it we already know that we're gonna make this one the same so we don't have to worry about that but for the rise what we're going to do is take seven inch rise that we've been divided by the total rise thirty-six and a quarter-inch and with that we're going to find out how many steps we're going to need to get from here down to here so using calculator thirty-six point two five or quarter of an inch divided by seven what we get is five four point one seven eight five and so on okay so one thing we that we did find out is it's going to be five steps but obviously you can't have a point one 785 of step so in this case where it's going to round it off and just be either five or six steps now we're going to go back to our original thirty-six and a quarter inch rise and we're going to divide it by the five steps that we now know that we're going to need so going back thirty six point two five divided by five steps what we get is seven point two five seven point two five or seven and a quarter hitch that is what we need to know for this so now we need now we know what we just figured out is for all these steps each one of these steps is going to be seven and a quarter inch rise over a ten inch run and what we also found out is we're going to do five steps for everything so five steps that being said what we're going to do now let's go over to the wood production lab and I'm going to lay out a stair stringer in front of you guys using what we just calculated here on the board as for tools the only tool you're gonna need is your framing square and these two stare gauges and the first thing we're going to do is set up the carpenter's square what I'm going to do is with what we just calculated of the rise and run I'm going to put onto this framing square what I do is I put these gauges on like this against the board and I'm going to line it up till this side equals or lines up to seven and a quarter and this side lines up with ten inches like this and then I tighten them down what I do after that is now I'm going to start making the actual steps just line up against the board and when I start on this side and we begin by drawing the first step like so that's gonna be our first step and also marking the very top of our stringer which I'll use the second framing square just so I don't have to take these on and off constantly and I'm just going to line it up and draw a line the whole way across now that first step I made I'm going to continue by just sliding this down and lining it up again with the line I just made and then continuing to my second step ever I keep doing this until I have the number of steps that I that I want which in our example will be five so one two then I'm just going to add three more just keep sliding down one two three four five okay and with the ball this this would be the bottom of our stringer so again just like the top I'm going to take in our famous square and draw a line across like so next thing we have to do or to consider at least is with every one of these trip here's our stringer right here each one of these top of these runs there's gonna be a tread board on top of it laying across about probably an inch thick across each one of these and when you get to the ground this part is going to be touching the ground fly on the ground so when I add an extra tread board here this rise is going to be an extra inch higher than all these other Rises throwing it all off so to consider that all we do I mean you just take an inch off the balm of your stringer so taking our framing square I line it up if the tread board that we're using it's an inch thick then we're gonna take an inch off the bottom like so line it up and then mark that's the line that we're gonna just cut right off and that's what's gonna be touching the ground now same thing has to be done to the opposite side where one thing I'll also consider is that every one the last two get up to our deck we're gonna need five Rises but the last rise is going to be the deck itself when we mount this on to it so the stringer itself will only have four Rises in this case which we have one two three four this top roster is gonna be here this this line right here is going to be cut so this is the top four stringer behind these lines with that with that we have to also at the same time to take out that extra riser board space that's going to be on every one of these right here which will be we're gonna say we also have to make room for what's called a ledger board and a ledger board is going to be a horizontal board that goes across all the stair stringers and connects them and at the same time gives you a flat surface and nailed that onto the deck itself so with the ledger board we're gonna make an inch and a half thickness and also like we did back there we're also gonna take an inch another inch off for all these riser boards that's gonna be here because we don't want to tread to be an extra inch wide or right down on the very top so with that we're gonna take a total of two and a half inches so just like before on the other side line this up take both riser board and ledger board space out line that up there you go this would be the top of our stairs stairs stringer all the way down to here that's it well I'm just gonna one with you now is cut this out and wrap this video up here's our final product from all lines that we determined to cut out what would be done in this case now afterwards is you would make one more identical stringer just like this or two depending on how wide you want your stairs to be and then afterwards you would attach your ledger board right here to attach all your stringers together onto the porch and then add some kind of footer to tie in to attach the landing as well on this side then finally you would attach your tread boards and Roger boards as you finish and that'd be it that concludes my tutorial i hope that you get something from this do-it-yourself project i'm we're friends

Channel: TripleSplashAttack

Views: 144,916

Rating: 4.5288787 out of 5

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Id: yBOuIf6Ias8

Length: 12min 40sec (760 seconds)

Published: Mon Nov 26 2012