Flooring Tile - border

I will be pouring a 800 sq.ft. Gyp-Crete floor, over which I will tile. There is a border of 2X4 wood around the perimeter (it is a log home) of each room. The Gyp-Crete will be level with the top of these 2X4's. Since there will be a transition between the wood and the Gyp-Crete, will this 2X4's complicate the tiling process? Should I simply be sure that they are tightly secured to the subfloor? Or are there other issues? Thanks!

Wood and concrete do not expand and contract equally with temperature changes. Wood shrinks over time and it swells with moisture changes and it tends to rot. With relative equality the same cannot be said for concrete. Tile needs a firm base.

Given those facts one method of approach is called a anti fracture membrane. It has other names also. Basically we're talking and engineered rubber membrane. This would be applied over concrete and wood. This is a high cost solution, and one that is not perfect. Using flexible thinset might help. One of the easiest and possibly the best solutions is to plan on movement in the first place then do something simple like band the 2x4s with wood trim or an engineered wood product and use a flexible sealant between tile and wood. If you don't like the wood idea, similar ideas can be reproduced in stone, stone tile, or tile. Any way you choose, purchase extra tile for repairs.

Thanks for the info, 2000!