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-   -   Stair stringers...lam plywood vs 2x12 (http://www.diychatroom.com/f19/stair-stringers-lam-plywood-vs-2x12-133059/)

cotyp 02-08-2012 06:44 PM

Stair stringers...lam plywood vs 2x12
 
hello fellow diyers, im building my own house and need to build some stairs.i was wondering if anyone has tried the method of ripping plywood into 12" x 96" sheets and taking 3 layers (staggered joints) to get the desired length. held together with construction adhesive and screws.... all the boards in this area are very less than desirable, and plus i like trying new things...
thanks for the help in advance


oh and using 3/4 so it would be a hefty 2 1/4 thick

Joe Carola 02-08-2012 06:55 PM

Quote:

Originally Posted by cotyp
hello fellow diyers, im building my own house and need to build some stairs.i was wondering if anyone has tried the method of ripping plywood into 12" x 96" sheets and taking 3 layers (staggered joints) to get the desired length. held together with construction adhesive and screws.... all the boards in this area are very less than desirable, and plus i like trying new things...
thanks for the help in advance

oh and using 3/4 so it would be a hefty 2 1/4 thick

No...you can't do that. You aren't reinventing the wheel here. Besides it would never pass inspection. You want plywood...use lvls. Every lumberyard carries them.

Hard to believe you can't find any straight 2x12's. What's the real story?

cotyp 02-08-2012 07:07 PM

well around here there are no codes. electrical and waste but thats about it. well the reason I asked is because , i spent 3 hours going to 3 lumber yards picking through wood and anything 16ft long is just terrible . hell its hard to find a good straight stud. anyway i saw a study on the ply vs 2x12 and results showed the ply being much much stronger . i respect your answer though i have read alot and some say hell no and some say they do it and its much stronger with no bounce .

joecaption 02-08-2012 07:46 PM

Use the LVL's no gluing, no screwing, just cut it and install.
Make sure to install a 2 X 4 behind it to make room for the skirt and drywall.
Also use constrution adhesive under the treads.

cotyp 02-08-2012 07:50 PM

Sounds like that might be the best plan. I have never seen lvls in our lumber departs. guess i will be ordering to what i need?

woodworkbykirk 02-08-2012 08:13 PM

plywood can be used but its a ton of work and has to be ok'd by an engineer.

ive done it this way for a deck using 4 plys of 1/2" pt plywood, reason being the stairs were circular. we had to do the same thing with the outside ribbon. ive seen guys kerf 2x to create a ribbon witha radius, but with a 1" deep kerp cut every 1/2" it leaves no strength in the 2x thus plywood

as for the lvl thing, ive done this also. easily the strongest set of stairs you'll ever build

BigJim 02-08-2012 08:32 PM

Some free standing radius stairs are built using plywood laminated to the radius you want. Using plywood you would have to take precautions to insure the stringers were straight. I do agree the LVLs would make a very strong and much better set of stairs.

cotyp 02-08-2012 08:34 PM

Thanks fellas!


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