Using a dehumidifier or humidifier to maintain relative humidity in the home at 30 50 will maintain the moisture level in the wood and help minimize cracks between the boards.
Humidity level for bamboo flooring.
Bamboo flooring should be within 3 of subfloor moisture content.
Humidity affects bamboo somewhat more severely than it does hardwood flooring if the flooring is installed in a very humid climate the moisture in the air can cause the floor planks to swell and buckle while in a dry environment the planks can shrink.
However during an arid desert s winter season humidity levels can drop to 10 20.
A subfloor of 1 1 8 plywood over joists at 16 on center is highly recommended.
Continued excessive humidity can cause swelling of the floor.
Concrete must be dry and fully cured at least 60 days.
If you see the interior humidity start to drop below 25 consider investing in a humidifier.
Continued lack of humidity below 20 can cause shrinking of the planks and or cracking of the bamboo strips.