One, review the renovation budget
If your renovation budget is limited, and you don't want to install flooring under the tatami mats, we recommend taking measures to prevent moisture buildup beneath the tatami mats during renovation. However, if your budget allows, we still recommend installing flooring, as concrete surfaces have poor moisture resistance, which can lead to moisture and mold issues under the tatami mats.
Two. Check if it is susceptible to moisture.
As we discussed earlier, installing flooring on the ground can better prevent the tatami mat from getting damp. If you live in a relatively dry northern area and are not on the ground floor, you can avoid installing flooring in the bedroom. However, in humid southern areas, especially during the rainy season, rooms are prone to dampness, and even if you install flooring, it may still feel damp. Therefore, it is recommended to install flooring.
Three. Whether underfloor heating is installed
If you plan to install underfloor heating, you don't need to install flooring first. This allows you to enjoy a warm and comfortable floor even with tatami mats, and also improves heat dissipation.
IV. Conclusion
In general, as long as the ground is properly protected against moisture, it is possible to install tatami mats without laying flooring underneath. However, this is only possible if the ground remains dry. For humid homes in southern regions where the tatami is located on the ground floor, it is still recommended to install the tatami mats on top of the existing flooring.