If it's made of chip-board/particle board/press-board (small chips of wood held together with glue) so they are wet for higher than a few hours they absorb water, expand, and lose their structural integrity.
Check to see kind of supplies they obtain. http://Www.Asystechnik.com/index.php/Points_To_Keep_In_Mind_Before_Working_With_Carpet_Cleaning_Company