Framing A Support Wall Under Stairs

These stairs have a lot of bounce to them, I’m going to frame a support wall in the middle to fix it.
First, I measure and lay off where the wall will go.
Then I cut a pressure treated 2x4 to the width of the stairs- 42”.
I fasten it to the floor using three masonry screws.
Next, I use my 4-foot level to plumb up and mark where the top of the wall will meet the stairs.
I make a mark on both ends and connect them with a level.
Now I need to figure out the angle of the steps- I start by making a plumb line on the stringer; then I take my speed square and rotate it so it’s parallel with this line- It’s a 31-degree angle.
I used my table saw to make a 31-degree bevel on both sides of the top plate.
I fasten this to the bottom of the stairs using decks screws- two per stringer.
Measuring from the bottom plate to the top plate I get the lengths for my studs.
I set my miter saw to 31-degrees and make the cuts.
It’s good to check that the angle is correct before cutting all of them.
I use screws to install everything so there are no squeaks- two in the top and two in the bottom.
Finally, I put the rest of the studs in- one directly under each stringer.
Now, these stairs are super sturdy – if you like this content, be sure to like and subscribe. @hausplans

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