Reply To: Blech on a glasstop oven? Home › Forums › Shabbos! › Blech on a glasstop oven? › Reply To: Blech on a glasstop oven? September 8, 2010 3:47 pm at 3:47 pm #695064 aries2756Participant You have to make sure that you do not cover the entire stove top or it will crack.