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Splicing Stringers

Question

I need to make stair stringers for a 10' rise. This will work out to the stair stringer being 18 to 20 feet long. I can only find 16' 2 X 12's. Is it okay to splice them to make them long enough? if so HOW?

Answer

Most building supply yards that deal with contractors sell dimension lumber to 20'. Home Depots, etc. only sell popular lengths to 16'.

You can build a set of stairs to a maximum total rise of 12' according to the code. You need a stair stringer of about 18', so I would get a 2x12 of 10' and 8' and splice them together with a 4' splice: 2' on each side of the joint, using a 2x12 as the splice. Put the splice on one side only and layout the opposite side. Just tack the splice in place until it is laid out. Then you can cut out the stair stringer and splice together. Then screw or nail the splice together well.

You should support the stair stringer with posts to take the bounce out, as mentioned in my How to Build Stairs articles.

Dave

(Ask Dave) (About Dave)

Your source for building tips, woodworking & furniture plans, house plans and building advice directly from Dave...

Hi, I'm Dave Osborne. With over 50 years experience as a journeyman carpenter, foreman and contractor in heavy construction I enjoyed working with apprentices and sharing the tricks of the trade that others shared with me. Now I get emails from Members all over the world and we include many of my answers in our Free Monthly Newsletters. Some of my answers include drawings and instructions specific to a project, but may also answer your questions. I use correct construction terminology, so you can confidently inform your building supply dealers or contractors exactly what you need.

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