pllllease help me with my stairs!!!

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making my first set of stairs, now the total rise is 8' which means i need 12 risers @ 7.25 with the final 13th rise being the platform. based on these same numbers, the run should be 126" right?now what it really killing me is i do not know what angle to cut the channel to cope into the platform, anyone know what i mean ??thanks so much.
Reply:Ok, you left out some info, but based on what you have given, here is what I found.8' rise7 25/64 rsrht  with a +/- of 5/6413 risers12 treads @ 10" widestringer length of 12' 5 7/32"run 10'incline angle is 36.47°for 12" treads:stringer is 14' 1 1/8"run 12' incline is now 31.63°Somebody better check me. That was done with my office calc....my good one is in the shop. I know it better and it will round off a little better than this one will...as you can see by the fractions. You can't enter the numbers as easily on this one, so something may be off. Hope not. If this is something that you will be doing all the time, I suggest you get a good Construction Master calculator. They are worth the price. Actually, they are pretty cheap now. MY first one was well over a hundred bucks. Sad thing is, I've been using them so long, I have forgotten how to do them on paper.
Reply:does this help Attached ImagesLast edited by TSOR; 08-17-2007 at 02:17 AM.
Reply:Try this for the cope.  I am assuming you are using 10" channel(doesn't matter what you use, just reference)  I am assuming you are going to draw everything on your stringers.  I am assuming you have excess at top of your stringer 3' is good.When you draw your top stringer run the line from the bottom of the tread all the way to the edge of the channel.  Also Draw a line to represent the top of our platform.  Now from the mark on the edge of the channel measure up 10" find the point where 10 inches intersect with the platform line-mark that point.  Connect the points with a chalk mark.  Cut along the marks.  The part cut out will be the coped tail for the opposite stringer.I have use this method a few times.  It came from a video from www.nomma.org.  The video features LLoyd Hughes and Chris Maitner as instructors.  It is well worth purchasing if you want to build steps.  The part I described is very hard to get in the video.  That is the only vague part of the video.Hope your are calculating your riser from where the steps will land and not plumb against the wall.  If the surface is pitched then it could cause problems.  Make sure the surface is finished and will not be higher when you come to install.Hope this helps.  You will quickly find out how easy it is to build stairs.
Reply:are these stairs for personal use or instalation somewhere?  i know around here on metal or wood steps you need an enclosed step backing and a lip extending over the backing if you follow what i am saying       just a questionwww.burdettenetworks.com
Reply:Originally Posted by tapwelderTry this for the cope.  When you draw your top stringer run the line from the bottom of the tread all the way to the edge of the channel.  Also Draw a line to represent the top of our platform.  Now from the mark on the edge of the channel measure up 10" find the point where 10 inches intersect with the platform line-mark that point.  Connect the points with a chalk mark.  Cut along the marks.  The part cut out will be the coped tail for the opposite stringer.
Reply:Iffy,For 96 inches total rise you will need (13) risers @ 7.375 inches.  This will bring you to within .125 inch of your total rise.  You will need (12) treads @ 10.5 inches to bring your overall staircase out to 126 inches. The calculated angle is about 35 degrees.
Reply:Originally Posted by ww8jIffy,For 96 inches total rise you will need (13) risers @ 7.375 inches.  This will bring you to within .125 inch of your total rise.  You will need (12) treads @ 10.5 inches to bring your overall staircase out to 126 inches. The calculated angle is about 35 degrees.
Reply:Originally Posted by TSORI didn't think the pic I posted needed any explanation.But, thanks anyway.
Reply:Originally Posted by ww8jTSOR,I don't believe that I made any comments about your picture. However, since you mention it, I think it is quite accurate, and am obviously in agreement with your dimensions.  There were also other dimensions posted that were not entirely correct, and I felt that agreement upon a calculation from more than one source would be helpful.