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If this is just single storey non load-bearing infill stud built off the pot and beam will be fine.

You need a civil engineering contractor, not general builder.

Is that a 300mm rise you mean, or +2.5m from eaves height?

^What Alex says^

The problem isn't the drainage behind the wall, it's the undermining of whatever foundations were there before by the stream. That said, putting a drainage arrangement behind the wall and weeps will help to alleviate any addtional build-up of pressure on the back of the wall. If it's...

It will **** it. d/t is the overall depth/flange thickness btw - related to bending stresses, not axial loading.

Depends on the construction. Older buildings can move without cracking, due to the soft materials used in those days. Or it could well have cracked, been repaired and not moved since. When you say "moved to the right", do you mean downwards, or laterally like a parallelogram? If the...

Hillsider is right IJ.

Abso no chance of whacking that depth in one hit. 150 layers, compact, lay next thickness, onwards and upwards. Ooi, why so deep?? :shock:

It's the buried pipework you need to look at.

Prolly something to do with the rwp to the left leaking and some rotation in the plane of the wall occurring as a result. Is there a return beyond the left of the photo? No point rebuilding without finding reason: if active movement, it will only happen again.

You can gift it to kids, pay proper (not peppercorn) rent and as long as it's 7 years or more before you need the services of the LA, or die, no one can touch it. If you die, no inheritance tax is payable, known as a potentially exempt transfer.

Ah I think the actual difference between us is that my head is not stuck in a book and I'm happy to use personal judgement. Not sure how my checking for dead and live in retrofit makes the connection with your concrete floor comment. Mebbs when I'm a couple of years off retirement I will...

You could theoretically use a scissor truss, but at that slack a pitch, it almost becomes a ceiling tie and you're back to normal type trusses. Don't forget these trusses would be at 600 centres too, so hardly the effect that you are seeking, viz sloping ceiling. ST is not the answer you're...

Yeh, live. I did dead plus live, allowing for fact that dead is already there in retrofit, so live way less than L/360. Perfectly adequate.

Funny that. I can get a 203x133UB25 with 11.4mm deflection dead and live, or a 152UC37 with 12.1mm deflection dead and live to work under those loads. If brickwork, deflections are 11.5mm (UB30) and 15.1mm respectively.

If you want a sloping ceiling, you won't be using trusses. SE can design rafters and ridge beam for you, shouldn't cost you more than £150 plus VAT off-plans. Flitch is gnerally a steel plate sandwiched between two timber beams, although there are variations on a theme.

A 203UC on a 3.4m span domestic? Rather smacks of serious overkill and all rather unnecessarily alarmist in terms of what might be required.

Yes.

I'm not disputing that a beam is most likely cheaper, but it's most def not the case that a lintel can't take a point load as you infer in your post.