Pile Cap Depth Pile Cap Depth Anne651 (Structural) (OP) 25 Oct 07 23:15 Does pile caps have to be below frost depth?So if I have grade beams, then its minimum thicknesswould be 4feet? Lets say I designed a grade beam to be500mm thick, do I have to make it 1.2m? RE: Pile Cap Depth hokie66 (Structural) 26 Oct 07 00:23 Frost depth would control the level of the bottom of your grade beam, but not the depth. RE: Pile Cap Depth msquared48 (Structural) 26 Oct 07 04:38 Adding to hokie66, you can always construct a concrete stem wall above a grade beam, and the wood framing over that. Mike McCannMcCann Engineering RE: Pile Cap Depth lkjh345 (Structural) 26 Oct 07 07:52 IMHO: I would check with your contractor (if known). Depending on the situation, and location of the project, many would prefer to cast the grade beam/pile caps the full thickness (in your case 1.2m) rather than cast a 500mm thick grade beam and come back and build a 700mm tall stem wall on top. It takes a lot of extra concrete but save forming labor. RE: Pile Cap Depth civilperson (Structural) 26 Oct 07 11:49 A heated building with external vertical perimeter insulation does not have to have pile cap base below frost depth.