Platform Decks

What type of concrete base is required to support structural pillars for raised decking.?

I intend to build a raised decking platform. The ground below is soil. I need to construct concrete bases to support the the pillars that support the decking base. What depth/mix of concrete do I need?

Public Comments

1. Here in central Ohio, the buiding code requires footers and pilings be dug to a depth of 36 inches below grade. This depth will vary according to your region and local codes. If the footers are not below the frost line, your deck will "heave" as the weather changes. If the soil is sandy or the water table is high, the footers may fail causing your deck to become unstable. Check with builders in your area for specific requirements.
2. It depends on where you live Here in the Northeast we put our concrete pillars 4' in the ground so we can get below the frost line If frost isn't an issue a depth of 2' should be strong enough to hold your deck Go to your local lumber supply house(HD,LOWES) and buy some 8" SONA-TUBES, this is a round cardboard type form that you bury in the ground and fill with concrete Just bury in the ground up to existing grade and then you can put your support Post on top of the concrete