Flexible Vinyl

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How to repair cracks in walls in continually shifting area?

My old 1939 house has a back entrance that does not have a foundation under it (just 2 metal rods, with cement at base (about 2 ft underground)). About a year ago we tore out all the walls and ceiling to insulated the area (we live in N. Canada so I am not sure why it wasn't insulated to begin with!)... Anyway, I did all the drywall installation, taping and mudding. Since the ground freezes and thaws each autumn and spring, this section apparently shifts quite a bit (as does the house a little). This has caused the horizontal seams between the drywall boards to come together, crumpling the mesh tape I used, and somewhat cracking the mud. Would using vinyl drywall compound on these seams work? I assume it would be more flexible (or at least less brittle) than regular compound, and might be able to withstand the seasonal shifting. Am I correct in thinking this?

Placing support piling will do not good what so ever...you live in an area where the frost line is deep...to stop movement, you have to set a foundation, about a foot deep, to rest on soil that is deeper than frost line...if you don't, the porch will constantly be moving up and down with freeze, and it does not move evenly. Nothing will prevent your problem but...if it is a porch, then just cover the seams with lathing strips, paint some color and leave it alone ....if you use 1x6, you can make a design of it.