I have an existing building with a narrow (650mm) 'fire escape' balcony running it's length.
I want to extend this balcony to 2.5m wide so it operates as a functional balcony for the apartments it services and provides covered carparks (x 3) below.
The building (balcony) is 18.8m overall, though 1.85m of the length is taken up with (steeply angled) stairs. These stairs will be removed and stairs with a more moderate grade installed. These will be stairs that return on themselves with a landing at the turn-around area.
The balcony FFL is 2.85m (2.7m to base, floor depth 150mm tilt slab).
The maximum pitch is 37 degrees, the maximum rise 190mm and minimum tread depth is 280mm.
17m under the balcony is required for the (3) car parks, allowing 2.8m for the staircase. There will be storage fitted below the staircase, ideally the first rise will be to 1.85m, to the turn/landing, and the second rise the remaining 1m.
I require someone with engineering qualifications to sketch a plan and ensure the load/attachment/bracing etc are all accounted for.
I anticipate that steel beams will be 'attached' to each of the 3 concrete beams currently supporting the balcony. I would prefer not to use steel support posts, but rather cross brace back to the building to support the load. Standard vertical support posts are fine around the stair area (which will need to remain in its current location).
Please see photos attached for more detail.
The balcony will only hold people, outdoor furniture and a few pot plants/BBQ etc.