Hello everyone!

I'm going to install a beam staircase to the loft and need some input/tips/advice from you here.
The beam staircase is second-hand, not a "wrong order," but more of an attempt to solve it "cheaply and adequately" ;-)
It turned out to have a slightly wrong angle on the steps or be too short for our ceiling height, and I have two proposed solutions.

The first proposal is to change the angle of the steps by inserting a wooden wedge, about 1cm to 4cm in size, between the steps and the beam. It's a bit tricky to get all the wooden wedges just right, but it's doable (I have some thick oak boards to saw wedges from).
This results in a slightly steeper staircase and saves a bit of space in the hallway "floor length," which is good.

The second proposal is to mount the beam against the garage wall (lightweight concrete 200 mm) instead of against the floor slab and make an extra step in the floor slab above the garage wall. This way, the staircase is level, and I avoid wooden wedges. The question is the durability against the lightweight concrete wall? There are two beams with a mounting surface of about 200x100 with two bolt holes in each.
There is a lightweight concrete beam at one of the attachments but regular blocks at the inner one. Do I need to install something like a wooden plate for a larger mounting surface, or is this sufficient? Bolts in plug or chemical anchor, or alternatively, through rods into the garage?

I thought of just gluing the staircase to the floor tiles due to underfloor heating.
Building a "platform/extra step" on the floor doesn't seem to have room, we think.
Re-welding the mounts on the beam would have been best, but I'm struggling to solve that.
Grateful for any input and ideas on this :)

Regards, Andreas
 
  • Steel beam staircase with a level placed on a step, leading to a ceiling opening, partially unfinished wall section visible nearby.
  • A metal beam staircase leading to a loft, installed alongside a white wall with a window; step adjustments are under consideration for proper fit.
  • A spirit level placed on a stair tread of a metal beam staircase, illustrating construction alignment adjustments.
  • Level on a black steel beam for measuring the angle; part of a staircase construction project.
  • Architectural plan sketch showing measurements and design of a loft staircase with details on beam fixation and step adjustments.
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