We have an existing covered porch and the footings are cement blocks that are sinking because they are just sitting on the ground. We are looking to jack up the roof part and redo the footings. I know we are supposed to go down 42 inches but at 40 inches is the sewage pipe. What can we do to properly secure this footing?
Technically you should go down below frost line with a form of a big foot type of structural base. If, as you say this maybe an issue you could pour cement pads or install patio slabs on top of undisturbed native soil. Put clear stone for drainage below and block from pad to underside of structure. This is a quick fix and may work for you for years to come. If there is a structural issue, the big foot base is with a proper engineer report would be best!
Get the ground below you scoped by contacting onecall.
Forget concrete footings. Once you locate underground obstructions, call a company to install thermal piles. They are large galvanized poles that screw into the ground. They are a little more expensive than concrete but are far superior and faster with no downtime waiting for concrete to cure. They have been using them to install light houses for decades.
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