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I’m remodeling a porch that is a rear entry way to a home. There is concrete steps there with a 4×8 concrete porch. Would like to build over the top of concrete with redwood deck. Can the joists rest on the concrete slab or is it necessary to remove the concrete altogether.
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It's pretty common in my area to build a wood porch/deck over a concrete porch.
Be sure you don't screw up the rise on the steps, though: you'll need to redo them, as well
*put a capillary break under each joist ( like a strip of ice & water) so the joists won't wick moisture thru the concrete...
*amazing, I'm trolling this site prior to getting bids on the exact same situation - a wood porch deck over an existing concrete stoop/steps. In our proposed design the ledger is bolted to the top step riser, thus making the stoop act as part of the foundation for one end of the porch (the other end & middle of the porch would be on piers). Do I need to check to see what type of foundation the stoop is sitting on, or is the fact that it has sat there unmoved for the past 80 years evidence enough that it should be able to support one end of a porch?
*Like Mike said just make sure you have a break between the wood and the concrete otherwise it'll start rotting quickly. Some cca blocking works pretty good. I just did the same thing...over a concrete patio with cedar.
*Last time I put a set of wood stairs over a concrete stoop I just built a couple of rectangular boxes for the framework. The wacked out concrete stoop made it very difficult to get a nice run. "Rim" joist threaded to #3 rebar set in epoxy and braced between posts at the top and redheads all the way to the bottom. Good and tight.Landscaping hides the side views below the treads. Even still, you could hang a skirt to simulate the runner.
*If the joist are treated lumber I wouldn't worry about capilary breaks. For that matter, unless you are in a very dry area I wouldn't build my joist without treated lumber.
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I'm remodeling a porch that is a rear entry way to a home. There is concrete steps there with a 4x8 concrete porch. Would like to build over the top of concrete with redwood deck. Can the joists rest on the concrete slab or is it necessary to remove the concrete altogether.