I bought a 2400 sqf house. It now has carpet everywhere. Below the carpet I have concrete slab in the new part (built in 2009, ~800 sqft) and the old house has a wood subfloor with on top a solid hardwood flooring (old house, built in 1959, ~1600 sqft). As you see from the pictures, the solid wood (old house) is about 3-4 mm below the level of the concrete slab (new house). Sanding the old ugly (thin planks)solid wood is not an option.
If possible, I want the same flooring everywhere. I am considering 2 options: Engineered wood and wood-looking porcelain tiles. Ruled out Luxury Vinyl for aesthetic reasons.
I would like to have continuous flooring between the 2 areas without transition areas, for open floor effect (9 foot opening, see picture). However, I am afraid that differential settlings between the old and new house might crack the floor. I am willing to take the risk of no transition but I would like to estimate the cost of a repair caused by differential settling in the 2 cases.
Summarizing, the questions are: which of the two options tiles, and engineered hardwood, would better handle movement across a subfloor joint with no transition?