I have a builder building a 2.5m x 2m porch (two skins of brick and a pitched roof). The plans for the foundation are I've been told a little excessive, 900mm deep with 600 x 200mm of concrete. The builders have been digging the trench for a couple of days in the pouring rain. The ground is sodden, the sides are caving in and the trench fills quickly. I bailed out 50cm of water at the weekend. I've come home to find they've poured the concrete and it's now under a couple of inches of water. The builder has told me that it will set better under water and not to bail it out, but from what I understand water dramatically affects the strength. Not only that it looks like it will get down to 0 or -1C tonight.
Is this likely to be an issue?
Thanks,
Tim