Standing seam, shingle and TPO on one structure in Q&A Posted March 18 10 hours ago, Jo_Ann said: Not true, David. This question has been asked before on the forum, and resolved. Can you please link me? I searched the forums thoroughly and have attempted Google many times. I've found information on seperate structures, but can't find anything about applying different types of roofs on one structure. I am new to the forums, I only signed in for this question, so forgive me for not finding it via the search feature. I don't navigate forums often.