Bonding wood and concrete together is a little more complicated than just putting the two together and having a finished product. Both the wood and the concrete need to be treated or modified to be able to be bonded together in a cohesive way that will actually keep the two materials together. Wood is flexible and concrete is not so there needs to be something added to give the concrete some flexibility. Additionally the different rates of expansion and contraction between these two materials means a guaranteed failure plane if you just try to bond one to the other.

Admixtures and adhesives are one way to create a lasting bond between concrete and wood so long as you have a decoupling layer between the two. Th decoupling layer allows for independent movement between the concrete and the wood without the contact point failing. However, even with all of these steps in place a "regular concrete" will have a hard time to stick to the wood (or the decoupling layer). A product like thinset is a heavily modified mortar that is "polymer rich". What does that even mean? It means that there are a lot of additives that makes this mortar able to bond to different materials, and also allowing for at least some flexibility in the mortar layer.

Cement boards are often used as a transition from wood to concrete (commonly when tiling floors). The concrete or cement board is attached to the wood and then the concrete or concrete product is applied to the cement board. This transition layer of cement board absorbs some of the flex from the wood and acts as a decoupling layer just the same a cementitious membranes like Redgard. Bonding concrete to wood is definitely one of the more challenging materials to marry together but with the right technical process is possible.

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