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Stair Question


JFS321's Avatar
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11-20-11, 06:34 PM   #1  
Stair Question

Guys, how deep can 2 x 12 stringers be cut according to code? I'm building 3 steps with a total height of 16 inches (5.33 in. rise) and I would like to have 11 inch treads with .25 inch nosing overhang...but is 11 inches too deep to cut the stringers? Thanks in advance.

Also, if these are going in a dry garage and the stringers will sit on concrete, should I still sit the stringer bottoms on plastic and/or use treated wood? Thanks again.

 
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11-21-11, 05:12 AM   #2  
Stringers

I like to cut the run 10 inches and have a 1-inch overhang. Others may have different ideas.

Use treated lumber to rest on the concrete floor.

How wide are your stairs?

How many stringers are you planning to use?

 
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11-21-11, 09:35 AM   #3  
Awesome...thanks. They are 38" wide with 3 stringers...3/4 plywood will extend down behind the tread and rest on the stringer for risers. If I don't hear anything else I'm going to go 10.5 deep on the stringer and 11 on the tread for a 1/2 in nosing.

 
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11-21-11, 12:01 PM   #4  
Riser

The top edge of the riser goes up against the under side of the tread above.

Allow for the riser thickness when cutting the run for the top step.

 
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11-21-11, 01:29 PM   #5  
Yes I will have the riser under the tread above. What do you mean 'allow for thickness on top tread? You mean cut the stringer not so deep? I had planned to leave the uncut backs of the stringers about 3 inches long to extend under the door threshold and to the wall where they rest. I figured that's how it was done.

 
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11-21-11, 02:32 PM   #6  
Stringer

If the top end of the stringer rests against a vertical surface, there needs to be a vertical cut to avoid having the end of the stringer coming to a point where the top run is cut.



Notice that the bottom riser height is reduced by the thickness of the tread.


Last edited by Wirepuller38; 11-21-11 at 02:58 PM.
 
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11-21-11, 02:51 PM   #7  
I see. So the vertical cut is made where the riser would theoretically be. Thanks again for the help.

 
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11-21-11, 02:55 PM   #8  
Stringer

Added diagram to post above. Good luck with your project

 
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11-21-11, 03:45 PM   #9  
Very helpful, thanks. Hopefully the 3 inch ' extensions ' to wall won't break any codes but I don't see why they would.

 
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