At my daughter's fixer: there is broken concrete and a gap around the concrete slab, at the edge where the exterior walls are. (2 photos on my picture page).

Anyone have a recommendation for the best product to fill and seal it up to make it waterproof?

How long ago did you use it - how has it held up?

Thank you!

My goal is to keep dampness and bugs out of the house. Without doing major construction. There is a dampness problem throughout, and we will probably paint the whole floor with dry lock (or similar) before laying flooring.

Presuming the settling or movement that caused this is over, I'd be inclined to;

Use a margin trowel or similar thin blade to scrap out any loose junk.

Use compressed air to try to blow out more junk.

Use vacuum to finish cleaning it.

Depending upon how deep the space is use either foam backer rod (could cut up a pool noodle) or spray foam to fill the bulk of it.

Finish with a decent caulk such as Geocel or Big Stretch to fill the top 1/4".

Did you find a solution to the water intrusion by the door?

The key is to keep the building-slab joint dry. Apply your sealant on a clean (as mentioned above) and dry surface, then let the sealant dry (read and follow the instructions) before applying dry lock paint. Use a fan to speed up the drying process, if necessary, and don't work in the rain.

Thanks y'all. I figured some sort of backer covered with some sort of caulk product. I'll do some research on those three products and pick what looks best. Of course, prep is always the most important step - that will be a good thing for my daughter to work on.

We're just getting going with tape/mud now, and looking for some decent weather to replace windows & door. It'll still be a while, since we bth have 2 jobs. It's been really good spending time together teaching her some stuff.

She actually surprised me and handled 20-minute mud "pretty" well - in small batches.

Steve: Thanks for remembering. Kinda. Rain still gets in one spot. I think I know what it is, but the rain won't stop long enough for it to be dry when I can get over there to address it. We basically layered flashing, & roofing tar under the siding, and on top of the concrete. It should be better after we get gutters on, too. I MAY also, in the future, try chiseling out a little groove in the concrete to help divert rain away.