I've had a slab engineered for an extension, where 20Mpa was specified.
A neighbour is doing a much larger project, but has a great deal on 32Mpa and can get that also for my slab.
Are there complications in substituting a higher grade, keeping the engineered specs for bars, trench mesh etc ?
Yes, I have asked the Engineer, but over a week with no response, and time is running short in confirming which way to go.
tia