my then wife decided to fill the hole in the floor ,this wasn't the problem but she covered the gas pipes and central heating pipes also .i came home from work saw what she had done and tried to explain neat cement and expanding pipes were not good also were do i fix the floor to.the next morning i carefully cleaned the cement away when hit the heating pipe i ran all over the house draining everything then carried on, you guessed it i then hit the gas pipe .to say i was lucky was an understatement