Dumb waiter style lift for disabled dog

[noseall]

I wonder how they signed off on any staircase in the uk... which all just have a trimmer at the end off the joists to make the hole for the stairs, ditto loft hatches etc .

They are usually chunky affairs.

All structurally trimmed out openings, i.e. roof lanterns, stair wells, Velux openings etc are usually specced up (as an SE item) on our jobs.

 

[shd1970]

We took a fireplace out fairly recently and one of the joists was cut short of the bearing wall, to allow the flue to pass. It rested on the fireplace wall which was subsequently removed. Neither the BCO nor the SE were happy with a repair (using the neighbouring joists. It had to be a full joist spanning wall-wall. These were chunky fellas at 70mm thick.

assuming that that was running parallel with an outside wall, i guess that was their concern and considering all the additional brickwork on the upper floors also being close, but hey, what do i know
however, in my scenario, its simply a joist virtually in the middle of a bedroom floor and there is nothing above it whatsoever, other than what would be furniture in the actual room

 

[shd1970]

The load carried by the middle joist is now being transferred to the left and right ones. If it’s divided evenly between them, they now carry 50% more load than they did before. Question: when they were originally designed, were they designed with 50% more strength than they actually needed? Do you have any paperwork to show that? If not: either do some calculations now to show that the proposed construction is strong enough, or add additional wood to make them stronger. Hint: just doing the woodwork will be both cheaper and quicker than employing a structural engineer!

(Note I am not a structural engineer!)

no paperwork whatsoever unfortunately, as the house was built back in the 70's
i'd be surprised if there were any calcs done at all when the house was built as judging by some of the walls, the builders didn't even appear to have a spirit level

 

[Tigercubrider]

Could a square steel frame be fitted to the floor? So it transferred the loads?
I’m a DIYer so no knowledge of structural engineering..