Do you want to keep the wood floor? It is rare to see wood floors as garage floors. I've seen homes like this moved onto pour basement slabs (same concept as pile foundation...but with a basement instead of dirt. If you want to keep the wood, then there has to be a way to keep the wood off of the concrete. An 18" crawl space (dirt covered with 6mil poly sheeting or cement) is always an option. The 18" crawl space would have to be cross vented/heated properly. This is for "keeping" the wood. Flooring. I'm not sure what has to be done to remove the wood floor and have the building sit (joists and all) on concrete. Remove the joists and you have plenty of stability problems. You would need to speak with a local architect/building engineer who has some knowledge of what you are trying to do, soil conditions, etc. to get this right. In theory it can be done (we've just landed a small car on a comet...we should be able to put an old building on a cement slab)...I'm wondering about the expense to get it there (excavation + soil stabilization + concrete + piles, etc).

If the flooring guy doesn't have any suggestions, he's not a flooring professional. Fire him and hire a real contractor who can deal with subsidence and settling issues.

We had the same issue with yellow/green streaks in our refinished rimu floors. It's something to do with tannins in the wood - we found the only way around it was to replace the affected boards with reclaimed ones. But make sure the reclaimed ones don't have the same issue by sanding and checking before laying.

Hi Temika We do this successfully on renovations. You do need to be mindful that the concrete under a copper washer are thick. Most floors can be matched successfully without over laying.