Trying to set my old ripped up mattress on fire. How to prevent the house from burning too? - Yahoo! Answers

"I finally got a new mattress so I want to get rid of my old one. Its too heavy to carry downstairs so I was going to burn it right in the room. How do I prevent from the whole house burning down? I set it in the middle of the room and away from the walls and the walls are covered in foil. Should this be good enough?"