Hello my name is Jeffrey and I have just started a flooring service in the Pennsylvania area . I received a call for a engineered wood repair . I went to see it and it was something I never saw before . Literally bubbles in the floor . From doing my research it looks like its an expansion problem . The run is longer than 30' . I am under the assumption that after 27' you must put a t- mold to allow for expansion. So my thoughts to fix the floor would be to cut an 1-2" gap after about 15' and install a t-mold . Will this fix the problem ? Also if the answer is yes , how long does it take for the floor to flatten back out ?