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@tony1851 I've uploaded a picture of the measurement of the outer brick skin to the inside blockwork. The blocks are approximately 120mm thick and 60mm of this is not being supported by the RSJ. @Leofric I've uploaded some pics to this msg and also more uploaded at the initial link.

@tony1851 Yes the RSJ was speced out by an SE and the BC came and signed off on it once installed. They didn't go round with a level or anything and it was a quick review of it on his day off.

The upper floor is just wooden. I guess that the inner leaf is partially supported by the I beam? You can see a ridge in the concrete blocks of the inner leaf and I believe that ridge shows where the original pier wall supported them.

I appreciate everyone's help - thank you. The size was approximately 5m long, bi-folds are 4.7m. The measurement of the top and bottom of the I is 20mm thick. Measurement of the bottom and top lip to the centre is approx 90mm I assume the outer top and bottom lip is the same, but it's been...

I'm no engineer but I doubt the beam has deflected (at all and definitly not 5mm or more) as the steel weighed over half a tonne and each part of the steel is 20mm thick :)

@wessex101 The beams sit directly onto the beam itself. So due to the slant on the RSJ/I-beam I feel that the joists are no longer level themselves and over the entire length of the beam the whole of upstairs has dropped by over 10mm. As you can see there are cracks in the back inner walls as...

I've had a set of bi-folds installed which required a 5m RSj to be installed too. The RSJ has been installed onto two pieces of cut steel and not padstones due to my exposed brick outer wall. The RSJ over it's length has in excess of 10mm difference in install height and the RSJ is not level...