'Afternoon All, I'm seeking the advice of more seasoned builders as I'd sooner learn from your follies than my own! I intend to build a 10'x12' raised coop for my chooks this spring and am wondering if anyone has had issues with building a walk-in structure on driven posts in an area where the frostline is approximately 3' below grade? The picture below shows a top-down view of how I plan to space the 5"-6" diameter pressure-treated posts and how I intend to run the joists between them to create the floor structure. Posts will be spaced 4' north-south and 3'4" east-west. East-west joists will be spaced approximately 1'3". The bottom of the floor joists are going to be leveled from a set point at 2' above grade at the highest point of the build so I'll have at least 2' of space underneath the whole coop to use as part of their run area. Most of the posts won't make it any deeper than 2'6"' - 3'6" deep before hitting rocks and since I'll need at least 2'4" above grade to build on I may only be able to sink some posts in 2' where the ground slopes away. SO! My question is... will this probably stand the test of time for maybe 5 years or will it end up subsiding and pulling apart? I don't want to do anything permanent on the site quite yet as I don't know if it'll be the best place for the coop and pouring concrete is expensive as many of you know - I have to work within our household's financial means; especially on extra-curriculars like this!