I'm trying to find out the strength required for the top support for a set of albini and fontanot modular stairs. The stairs are called Kompact U 89. They are bolted to a top support and slotted together from the top down until they reach the floor, where they are also fixed. In the middle there is the need for an "intermediate support" if the flight is over 7 consequetive steps, which mine is (13).
I can't find anything from the manufacturer on the web - and one salesmen said "no one has asked me that before". and I can't get any figures from any of the UK suppliers so far.
I have found an old italian catalogue for a similar set of stairs, this had a diagram of a concrete beam 180mm high by 200mm wide at the top with 120mm bolts into it. I really do not want to use such a massive beam, especially not concrete. Another salesman said he knew someone who had the stairs resting on a lath and plaster wall!
Has anyone used these stairs in any project? what did you do? where is the weight mostly? hanging from the top or transfered to the bottom? what is the assumed load on a stair, besides it's own weight?
Any help would be really appreciated...