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No, wet concrete will not bond to dry concrete without an additional bonding agent. The common alternative is adding a sand or gravel layer under a concrete slab to enhance bonding and create a stable foundation. The right choice depends on the height and thickness of your two slabs, local laws, and the use of the specific concrete slab.

Concrete countertops can last a lifetime with proper maintenance. That includes regular resealing, waxing, and repairing any chips or cracks. At a minimum, they should last 20 years before major issues occur or performance drastically declines. The longevity of concrete countertops is a major reason people add them to their kitchens. It also makes up for the high cost of installation and added maintenance.

Concrete houses cost 10% to 20% more to build than stick-built homes, and maintenance on home systems is more invasive and expensive due to pipes and wires being buried in concrete. Concrete homes can also look more industrial and less comfortable if you don’t cover the concrete with finishing materials. It’s also more challenging to make changes to concrete, so reframing doors and windows or building home additions will cost more. Concrete needs time to cure, too, so the timeline to build a house out of concrete is a bit longer.

Epoxy and polyurethane sealers can last five to 10 years, while acrylic sealers last two to three years or more depending on the use, wear of the surface, and type of sealer you choose. Areas that see heavy traffic or extreme ice and snow may require more frequent sealing. Test your concrete every two years to gauge how it responds to absorbing water or if it fully repels it for longer than 20 seconds.