1.   It has a steel skin over rigid foam insulation, and it often is reinforced with blocks of wood around lock openings and other critical points.

2.   Some low-quality steel doors have corrugated cardboard inside instead of rigid foam.

3.   The team decided to go with the rigid foam because it is stronger and quiet when the wind blows, unlike tents, said Schildecker.

4.   Today, the name has become synonymous with all rigid foam products.

5.   When you have to lie on the floor to service the car, make a mat from a piece of rigid foam insulation.