We are planning to install a new floating floor. Currently, there is a laminate floor that I believe (?) is laid directly on the tongue and groove, possibly with a poorly insulated intermediate joist. There is likely some type of underlay foam. Under the floor, there is a crawl space with relatively high humidity, which is managed through negative pressure ventilation and controlled dehumidification. The floor we are considering installing is a wooden floor. What I'm wondering is whether it has any "construction-related" significance if I remove the old floor or not? Could it possibly even be better (?) to leave it in place? Are there any aspects regarding moisture? Regarding "seal" against the crawl space? The new floor will obviously add some height, so it also depends on whether it can be resolved with thresholds, etc.
Yes, the crawl space needs insulation as it is currently unheated. I believe that the "new" floor on top of the original floor actually makes a difference in the insulation. However, it is somewhat tempting to sand the original...