Q. I'm wanting to replace the wood 2x4 joints in my patio, which are starting to rot with concrete. What is the best product to use to fill this 1.5"x2.5" cavity?
A. You can use a product from CTSCEMENT called Rapid set CementAll Concrete Mix. We use this product for repairing concrete and filling holes like the one you have. Only mix in small batches, this material sets up in 15 minutes.