wrote:

I want to get an understanding of what is required so, of course, I
downloaded superbeam 4 to have a bit of a play.
The example in there is for a loadbearing wall with a brick wall
upstairs so I changed that to loadings for a stud wall. Am I right
that I can delete the roof load?

I would expect so...

The upstairs floor load is half of
the length of each joist - i.e. half of the distance from front ot rear
of the house multiplied by the loading factor?

If the joist in uniformly loaded, then you will see half the reaction of
the total down force at each end. Hence the load on your lintel will be
the weight of the blocks/bricks above it, plus the sum of the downforces
of all the beams resting on the lintel.

For the current door this gives me "r1comp=4.66, r2comp=4.66, Max
S.F=4.66" Are any of these the UDL? Going to the catnic website they

I presume UDL is Uniformly Distributed Load (as opposed to a point load)...

ask for UDL. The max UDL of the catnic corrugated beam is 7kN.
It would appear that just about any beam long enough would do for the
double door opening. Is there any advantage of using a catnic over a
UB?

Don't know...

In terms of bearing area, am I right in thinking that the bearing area
of the beam (the part in the wall) needs to be enough so that the
pressure is spread and within the limits of the block work i.e. the
large the loading the more of the beam needs to go into the wall. The
catnic website simply states "150mm".

You don't want it concentrated on a tiny section, but once you have got
to something like 150mm I would expect you will need a fairly serious
load to raise the pressure at the contact point to something that would
crush even fairly light blocks.

--
Cheers,

John.

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