1.   An easy way to redirect this heat into the room is with a piece of foil-faced foam insulation board.

2.   Or, sometimes roofers will put insulation board over an old roof and apply the rubber roof to that.

3.   You can make such a reflective shield by gluing heavy duty aluminum foil to the front of a sheet of foam insulation board or heavy corrugated cardboard.

4.   The explosion occurred during repair work in the basement of a plant that makes a form of polystyrene for insulation boards.