We're adding some additional elements to our building and are trying to spec out the size of the flitch beams that'll be needed for the job.
It is a 5.8m span between the ends of the beams (in blue), with the partitioning wall only able to transfer about 0.39kN/m2 down to the pozi joists below.
Domestic floors are required to support a dead load of 0.6kN/m2, and imposed load of 1.5kN/m2... but is that overkill for a storage mezzanine? Anyone dealt with something similar?
Good news is that there is a very cheap resoution after all! And far less technically challenging.
Rather than ~£1.5k on flitch beams, Nicks idea of reinforcing the joists beneath the partitioning wall is a green light.
It requires some specialist material rather than plywood, but a 45mm thick Kerto S beam affixed with ESCR screws to each joists will reinforce them enough according to our engineer. Only about £200 after delivery fees.