Hi, i'm new to forum and i'm hoping someone can help me out with some info , or if someone has run into this. I'm building a 30 x 48 pole building which i will be using 6x6 pt posts , well i drilled my holes to set my posts in and after 1 day i had about 3 ft of standing water in them, now my building dept wants me to put 2 bags of concrete in the bottom of each hole as a footing . The problem is i don't know if the concrete will set up in the standing water or not , and i'm also a little worried that if the water table is that high for 9 mos. out of the year how long are my posts going to last. Any advice is greatly appreciated.
Concrete will set up under water, as noted in the previous post. However, you should tell the concrete supply company that you planning to place the concrete under water, they will bring a truck with the proper mix.
Since you are building a pole building, you should consider using one concrete footing (in a sonotube, as previously recommended) per pole. I would bring the footing at least six inches above grade, and use a commercial bolt on plate (Simpson makes one, so do other companies) to attach the 6x6 PT pole to each footing. Check with the building department first, they may have requirements about the type of connector they need to see.