Response from LEGO SHOP
18 April 2017
Haley - Consumer Service Specialist, Consumer ServicesMaking base plates thicker is great feedback to bring forth to the design team. The base plates should not be warped or bent. Be sure you're storing them in a temperate environment and they lay flat when not in use. If you're looking for thicker plates you can find some larger plate elements on our Bricks & Pieces "Buy Bricks" selection. These large base plates are significantly thinner. We make 16x16 in a nice variety of colors. Four of those would cover the same area as one of these base plates. Visit LEGO.com/Service for more information.