We were enamored with the descriptions of Cali Bamboo Flooring, the different selections, the widths and the hardness of the product. We installed it paying close attention to your recommendations for acclimation to the environment and literally let the product sit in our house in a latticed stacked position for 3 - 4 months. We installed following directions precisely, leaving minimal 1/2″ space all around at walls, doors, etc. We have had nothing but ongoing bulging, areas raised as much as 1 - 1 1/2 inches. We had to remove baseboard throughout the entire install area, pry the edge boards out as they had expanded under the drywall, re-cut the edge boards 1/2″ back from the wall, put baseboard back and 2 months later have encountered the same problems. Our opinion of this product is — I would never ever use bamboo flooring again unless it was glued or nailed down. But we can't do that as we have a radiant floor heat system. We were assured this was an acceptable product to use. The local salesman who sold it to us (and the Cali customer service rep we spoke with) said it's a great product and would work well in our climate. We are in the mountains of North Carolina and our humidity runs 40 - 65%. My recommendation is there are other and better products to be had for less money!