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 2×4 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

#build #howto #carpentry #framing #stairs #wall #construction #diy #contractor

23 Replies to “Framing A Support Wall Under Stairs”

  1. But now ya can’t build a small room under the stairs for your wizard in training.

  2. Great but the bevel on the top plate isn't really necessary though it is a nice touch. Good job.

  3. Это конечно решает проблему ,но так не делают плотники это халтура.

  4. All wrong, the welding seam looks atrocious, wrong rod, voltage too high 😂

  5. You skipped the step where you added an extra syllable syllable to "masonry". 😉

  6. Finally someone using pressure treated wood for ground/cement contact!!!!!! Excellent

  7. Lumber should never come in contact with concrete a sill gasket is required.

  8. Mason-airy? It's masonry… and those are TapCons into a concrete floor, not into masonry (I would have used mushroom nails).
    You made that so difficult when it could be so simple. The inside stringer is already next to a wall.

  9. American build: in Holland we use proper bricks. No wood and cardboard

  10. Groundbreaking stuff right there , carpenters around the globe flocking to youtube to learn how to build a 4ft frame.

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