Concrete footings for new basement support columns
Asked May 23, 2009, 08:23 AM
I'm replacing the support columns under the main beam in a small cape cod. I just wanted to run my footing plans by everyone so I know if I'm making any glaring mistakes. I've cut open the existing slab and dug 18"-square x 19" deep holes for the footings and adjustable monoposts (see attached pic).
- Is rebar even required? I don't believe it is, but plan on adding anyway. Are (2) 'X'-patterns 3" up from bottom and down from top good, or would a different pattern be better?
- Is the 3/4" gravel required for drainage? These posts are in the center of an existing poured slab, so I'm not sure water will even get to them.
- Are (2) anchor bolts enough in the bottom plate, or should I go with (4)? There will also be a 2nd concrete pour to cover the adjusting screw.
Thank you to everyone for any input.