Adding pillar support for RSJ

[robinbanks]

Just a minor point, to avoid you generating confusion in terms - you said UC25 by which I guess you mean “universal column, 25kg/m” but columns are essentially a square cross section (look like an H) and and designed for installation in a vertical orientation; you also gave a pair of dimensions that aren’t square and indicated the installation would be horizontal, for which the term of reference would be a “universal beam”

 

[Ab12]

Just a minor point, to avoid you generating confusion in terms - you said UC25 by which I guess you mean “universal column, 25kg/m” but columns are essentially a square cross section and and designed for installation in a vertical orientation; you also gave a pair of dimensions that aren’t square and indicated the installation would be horizontal, for which the term of reference would be a “universal beam”

Thanks, changed to UB

 

[tony1851]

Thanks Tony,

This is what I'm working with here:

And some bits below just to clarify so I understand fully. And answer your last comments.

Brick wall is 2.3m tall, the other block wall is 3.3m tall (it's built up from lower garden ground) but still at the same top level all the way round. The back block wall has a return where it is attached to the brick wall return with starter kit. The front (garage door opening) has a small return of 2 bricks thick on the brick side.

1. To confirm I can use 203*133 ub25 for the centre of the roof to split the roof in half and carry one end of the roof joists?

2. I can also the same size steel 203*133 ub25 across the double garage opening to carry the span of the roof there, and potentially a lightweight roller shutter?

3. So that I don't see a padstone, but see brick instead, I can use a steel plate under each bearing of the steel onto the brick wall of 215 x 100 x 12-15mm thick instead of the padstone recommended

4. The steel can sit on the single brick, does not need piers where the steel will rest, but as long as I have my single brick wall with supporting piers along then it's okay?

5. Question: if it's sat on the single brick, am I simply bricking it in from the sides to stop it moving sideways? BUT what stops it from potentially sliding off the 100mm it's sat on, as you said it needs not be bolted down

Thanks ever so much

Yes to 1-4, subject to points made previously (exposure, returns etc) Re 5, gravity + friction keeps the beam in position.
Of just a little more concern is the height of the block wall above ground level (3.3m). Wind applies not just horizontal compressive force on walls but, more significantly, suction often on the lee side.
Whenever there have been heavy gales across the country, news footage usually show walls such as gable walls, falling outside a house rather than falling inside. This is the effect of wind suction.
The 3.3m high wall will be OK with the wind blowing onto it from the lower side, but there will be little to nothing to tie it back when suction wants to pull it outwards.
You need to ensure that this wall particularly is well-tied at roof level. If possible, I'd be inclined to tie it to the concrete floor inside as well with a few restraint straps - this would help to an extent.